Servidor de Acesso OpenVPN: a sub-rede remota não pode acessar os recursos do cliente

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Eu tenho o OpenVPN Access Server em execução no AWS. Aqui está a configuração: 

172.18.16.0/20
Client (172.18.16.101) ----- OpenVPN Server (172.16.0.0/20)
                                     |
                                     |
                                     |
                                     |
                               Private Subnet (172.16.16.0/20)

O cliente pode se conectar ao servidor OpenVPN. O servidor OpenVPN pode executar ping e acessar recursos no cliente e também na sub-rede privada. O cliente também pode acessar todos os recursos no servidor OpenVPN, bem como a sub-rede privada. Além disso, o servidor OpenVPN também pode acessar recursos no cliente. No entanto, as caixas na sub-rede privada parecem não conseguir pingar ou acessar recursos no cliente.

Configuração de rede do servidor OpenVPN: 

as0t0     Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:172.18.0.1  P-t-P:172.18.0.1  Mask:255.255.248.0
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:18 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:200 
          RX bytes:1223 (1.2 KB)  TX bytes:968 (968.0 B)

as0t1     Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:172.18.8.1  P-t-P:172.18.8.1  Mask:255.255.248.0
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:200 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

eth0      Link encap:Ethernet  HWaddr 06:e2:83:cf:4f:27  
          inet addr:172.16.12.204  Bcast:172.16.15.255  Mask:255.255.240.0
          inet6 addr: fe80::4e2:83ff:fecf:4f27/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:9001  Metric:1
          RX packets:1355 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1193 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:124194 (124.1 KB)  TX bytes:153022 (153.0 KB)

Tabela de rotas do servidor OpenVPN: 

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.16.0.1      0.0.0.0         UG    0      0        0 eth0
172.16.0.0      0.0.0.0         255.255.240.0   U     0      0        0 eth0
172.18.0.0      0.0.0.0         255.255.248.0   U     0      0        0 as0t0
172.18.8.0      0.0.0.0         255.255.248.0   U     0      0        0 as0t1
172.18.16.101   0.0.0.0         255.255.255.255 UH    0      0        0 as0t0

Uma caixa na tabela de rotas da sub-rede privada: 

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.16.16.1     0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0
172.16.16.0     0.0.0.0         255.255.240.0   U     0      0        0 eth0

Eu executei o tcpdump na interface as0t1 da caixa do servidor OpenVPN enquanto fazia ping de uma caixa na sub-rede privada para o cliente. Parece que os pedidos foram encaminhados para o cliente, e o cliente também enviou de volta as respostas (visto na caixa OpenVPN). No entanto, parece que pára por aí e as respostas nunca foram postas de volta em eth0. Eu sinto que a tabela de roteamento deve estar correta, pois o servidor OpenVPN pode alcançar tudo e o cliente também pode alcançar a sub-rede privada. Eu pensei que o problema estava no iptables, mas depois de passar horas olhando para ele, eu estou começando a desistir. Aqui estão as tabelas:

Tabela de filtros 

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
AS0_ACCEPT  all  --  anywhere             anywhere             state RELATED,ESTABLISHED
AS0_ACCEPT  all  --  anywhere             anywhere            
AS0_IN_PRE  all  --  anywhere             anywhere             mark match 0x2000000/0x2000000
AS0_ACCEPT  udp  --  anywhere             anywhere             state NEW udp dpt:openvpn
AS0_ACCEPT  tcp  --  anywhere             anywhere             state NEW tcp dpt:https
AS0_WEBACCEPT  all  --  anywhere             anywhere             state RELATED,ESTABLISHED
AS0_WEBACCEPT  tcp  --  anywhere             anywhere             state NEW tcp dpt:943

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
AS0_ACCEPT  all  --  anywhere             anywhere             state RELATED,ESTABLISHED
AS0_IN_PRE  all  --  anywhere             anywhere             mark match 0x2000000/0x2000000
AS0_OUT_S2C  all  --  anywhere             anywhere            

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
AS0_OUT_LOCAL  all  --  anywhere             anywhere            

Chain AS0_ACCEPT (5 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_IN (3 references)
target     prot opt source               destination         
ACCEPT     icmp --  anywhere             ip-172-18-0-1.ap-southeast-1.compute.internal  icmp echo-request
ACCEPT     icmp --  anywhere             ip-172-18-8-1.ap-southeast-1.compute.internal  icmp echo-request
AS0_U_TMBDLP_IN  all  --  ip-172-18-16-101.ap-southeast-1.compute.internal  anywhere            
AS0_IN_POST  all  --  anywhere             anywhere            

Chain AS0_IN_NAT (1 references)
target     prot opt source               destination         
MARK       all  --  anywhere             anywhere             MARK or 0x8000000
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_IN_POST (2 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             ip-172-16-0-0.ap-southeast-1.compute.internal/16 
AS0_OUT    all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            

Chain AS0_IN_PRE (2 references)
target     prot opt source               destination         
AS0_IN     all  --  anywhere             ip-192-168-0-0.ap-southeast-1.compute.internal/16 
AS0_IN     all  --  anywhere             ip-172-16-0-0.ap-southeast-1.compute.internal/12 
AS0_IN     all  --  anywhere             ip-10-0-0-0.ap-southeast-1.compute.internal/8 
DROP       all  --  anywhere             anywhere            

Chain AS0_IN_ROUTE (0 references)
target     prot opt source               destination         
MARK       all  --  anywhere             anywhere             MARK or 0x4000000
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_OUT (2 references)
target     prot opt source               destination         
AS0_U_TMBDLP_OUT  all  --  anywhere             ip-172-18-16-101.ap-southeast-1.compute.internal 
AS0_OUT_POST  all  --  anywhere             anywhere            

Chain AS0_OUT_LOCAL (1 references)
target     prot opt source               destination         
DROP       icmp --  anywhere             anywhere             icmp redirect
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_OUT_POST (2 references)
target     prot opt source               destination         
DROP       all  --  anywhere             anywhere            

Chain AS0_OUT_S2C (1 references)
target     prot opt source               destination         
AS0_OUT    all  --  anywhere             anywhere            

Chain AS0_U_TMBDLP_IN (1 references)
target     prot opt source               destination         
AS0_IN_NAT  all  --  anywhere             ip-172-16-0-0.ap-southeast-1.compute.internal/16 
AS0_IN_POST  all  --  anywhere             anywhere            

Chain AS0_U_TMBDLP_OUT (1 references)
target     prot opt source               destination         
ACCEPT     all  --  ip-172-16-0-0.ap-southeast-1.compute.internal/16  anywhere            
ACCEPT     all  --  ip-172-18-0-0.ap-southeast-1.compute.internal/20  anywhere            
ACCEPT     all  --  ip-172-18-16-0.ap-southeast-1.compute.internal/20  anywhere            
AS0_OUT_POST  all  --  anywhere             anywhere            

Chain AS0_WEBACCEPT (2 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere

Tabela NAT 

Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
AS0_NAT_PRE_REL_EST  all  --  anywhere             anywhere             state RELATED,ESTABLISHED

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
AS0_NAT_POST_REL_EST  all  --  anywhere             anywhere             state RELATED,ESTABLISHED
AS0_NAT_PRE  all  --  anywhere             anywhere             mark match 0x2000000/0x2000000

Chain AS0_NAT (3 references)
target     prot opt source               destination         
MASQUERADE  all  --  anywhere             anywhere            

Chain AS0_NAT_POST_REL_EST (1 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_NAT_PRE (1 references)
target     prot opt source               destination         
AS0_NAT    all  --  anywhere             anywhere             mark match 0x8000000/0x8000000
AS0_NAT_TEST  all  --  anywhere             ip-192-168-0-0.ap-southeast-1.compute.internal/16 
AS0_NAT_TEST  all  --  anywhere             ip-172-16-0-0.ap-southeast-1.compute.internal/12 
AS0_NAT_TEST  all  --  anywhere             ip-10-0-0-0.ap-southeast-1.compute.internal/8 
AS0_NAT    all  --  anywhere             anywhere            

Chain AS0_NAT_PRE_REL_EST (1 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_NAT_TEST (3 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             mark match 0x4000000/0x4000000
ACCEPT     all  --  anywhere             ip-172-18-0-0.ap-southeast-1.compute.internal/20 
ACCEPT     all  --  anywhere             ip-172-18-16-0.ap-southeast-1.compute.internal/20 
AS0_NAT    all  --  anywhere             anywhere

Tenho quase certeza de que o problema está nas regras do iptables, mas não consigo rastreá-lo. Apenas por diversão extra, eu também estou lançando a saída do rastreio iptables (capturada na caixa OpenVPN) aqui.

Caixa na sub-rede privada Acessando o servidor MySQL no cliente (com falha): 

Aug 28 17:42:33 localhost kernel: [21906.075591] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075603] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075608] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075616] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075620] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075625] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075629] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115440] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115452] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115458] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115466] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115470] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115475] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115480] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175467] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175474] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175479] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175486] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175490] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175494] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175498] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.077995] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078007] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078012] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078021] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078025] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078030] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078034] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287922] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287932] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287937] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287945] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287949] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287954] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287958] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165296] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165308] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165313] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165321] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165326] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165330] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165335] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285405] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285414] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285419] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285427] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285431] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285435] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285440] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097914] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097926] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097931] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097939] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097943] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097948] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097964] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:49 localhost kernel: [21921.527746] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2530 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026632383250188401030308) 
Aug 28 17:42:49 localhost kernel: [21921.527756] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2530 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026632383250188401030308) 
##### the rest are cut due to exceeding number of characters allowed #####

Configuração de encaminhamento 

$ cat /proc/sys/net/ipv4/ip_forward
1
    
por keerati 28.08.2015 / 23:40

1 resposta

0

Versão TL; DR:

  1. No painel do EC2, selecione a instância do EC2 que está executando o OpenVPN Access Server
  2. Clique em Ações - > Rede - > Alterar origem / destino Verifique - > Sim, desativar

Para obter mais informações: Desativando verificações de origem / destino

Acontece que todas as minhas configurações de rota e do OpenVPN estavam corretas e era um problema específico da AWS. Eu me deparei com a resposta enquanto pesquisava especificamente sobre como configurar o OpenVPN na AWS:

Conectando um EC2 VPC com o OpenVPN tráfego roteado sendo perdido

O que aconteceu com ele (citado abaixo) foi exatamente a mesma coisa que estou vendo ..

However here's the kicker. Doing a tcpdump on the EC2 OpenVPN server shows all traffic flowing as it should:

[root@ip-10-2-0-10 ~]# tcpdump -i eth0 -n host 10.1.0.3
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
13:46:58.779826 IP 10.2.0.12 > 10.1.0.3: ICMP echo request, id 21846, seq 1, length 64
13:46:58.852756 IP 10.1.0.3 > 10.2.0.12: ICMP echo reply, id 21846, seq 1, length 64
13:46:59.787467 IP 10.2.0.12 > 10.1.0.3: ICMP echo request, id 21846, seq 2, length 64
13:46:59.847424 IP 10.1.0.3 > 10.2.0.12: ICMP echo reply, id 21846, seq 2, length 64
    
por 02.09.2015 / 18:45

Tags

Reencaminhamento de porta do Windows, máquina local para servidor Ansible trava ao copiar de um host remoto para hosts remotos