Estou configurando um roteador secundário (DD-WRT) para atuar como um cliente OpenVPN para que todos os clientes tenham acesso VPN simplesmente conectando-se ao roteador. Mas parece que o tráfego dos clientes é sempre roteado através do gateway principal em vez do túnel VPN estabelecido.
CONFIGURAÇÃO
ISP modem+router(gateway) <--LAN cable--> DD-WRT OpenVPN client <--LAN/WIFI--> clients
Esse cliente DD-WRT OpenVPN secundário pode se conectar ao servidor OpenVPN remoto ok.
Eu posso pingar hosts na sub-rede do lado do servidor, primeiro telnet no DD-WRT.
O servidor OpenVPN também mostra que o cliente DD-WRT está conectado corretamente.
wget -O - link retorna o IP público do servidor remoto.
O túnel está funcionando corretamente.
PROBLEMA
O tráfego de clientes conectados ao meu DD-WRT é roteado pelo meu roteador de gateway,
não através do túnel tun0 da VPN.
Acho que preciso encaminhar o tráfego da interface br0 para a interface tun0.
Tentei seguir as regras do iptables e verifiquei se o encaminhamento IPv4 está ativado .
cat /proc/sys/net/ipv4/ip_forward ==> 1
cat /proc/sys/net/ipv4/conf/tun0/forwarding ==> 1
cat /proc/sys/net/ipv4/conf/br0/forwarding ==> 1
# These rules are saved by pressing the 'Save firewall' button
#and rebooting the DD-WRT router.
iptables -I FORWARD -i br0 -o tun0 -j ACCEPT
iptables -I FORWARD -i tun0 -o br0 -j ACCEPT
E separadamente
# These rules are saved by pressing the 'Save firewall' button
# and rebooting the DD-WRT router.
iptables -I FORWARD -s 192.168.2.0/24 -d 192.168.66.0/24 -j ACCEPT
iptables -I FORWARD -s 192.168.66.0/24 -d 192.168.2.0/24 -j ACCEPT
CONFIGURAÇÕES
modem ISP + roteador de gateway
No settings modified. It is as ISP has set it.
Cliente OpenVPN DD-WRT
- Firmware: DD-WRT v24-sp2 (08/12/10) vpn
- SPI firewall: Disabled
- WAN: Disabled
- Operating mode: Router (this disables NAT, right?)
- Gateway: 192.168.2.1
- Local DNS: 8.8.8.8
- NTP client: Enabled
Eu não envio configurações de servidor / cliente VPN porque o cliente pode se conectar ao servidor sem erros e ambos
Os comandos ping e wget funcionam corretamente dentro do DD-WRT.
Então, minha pergunta é:
Como faço para rotear todo o tráfego de clientes conectados ao DD-WRT para o túnel tunel do OpenVPN?
Estou usando o iptables incorretamente? Adicionar uma nova rota, talvez?
Se alguma informação estiver faltando, por favor, pergunte.
Agradeço antecipadamente! :)
P.S. Abaixo mais informações.
TABELA DE ROTEAMENTO (depois que o túnel VPN está ativo)
root@DD-WRT:~# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
87.219.xxx.xxx 192.168.2.1 255.255.255.255 UGH 0 0 0 br0
192.168.66.1 192.168.66.5 255.255.255.255 UGH 0 0 0 tun0
192.168.66.5 * 255.255.255.255 UH 0 0 0 tun0
192.168.5.0 192.168.66.5 255.255.255.0 UG 0 0 0 tun0
192.168.2 .0 * 255.255.255.0 U 0 0 0 br0
169.254.0.0 * 255.255.0.0 U 0 0 0 br0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default 192.168.66.5 128.0.0.0 UG 0 0 0 tun0
128.0.0.0 192.168.66.5 128.0.0.0 UG 0 0 0 tun0
default 192.168.2.1 0.0.0.0 UG 0 0 0 br0
EXIBIÇÃO DE ROTEIROS DE IP
root@DD-WRT:~# ip route show
87.219.xxx.xxx via 192.168.2.1 dev br0
192.168.66.1 via 192.168.66.5 dev tun0
192.168.66.5 dev tun0 proto kernel scope link src 192.168.66.6
192.168.5.0/24 via 192.168.66.5 dev tun0
192.168.2.0/24 dev br0 proto kernel scope link src 192.168.2.160
169.254.0.0/16 dev br0 proto kernel scope link src 169.254.255.1
127.0.0.0/8 dev lo scope link
0.0.0.0/1 via 192.168.66.5 dev tun0
128.0.0.0/1 via 192.168.66.5 dev tun0
default via 192.168.2.1 dev br0
IP REGRA MOSTRA
root@DD-WRT:~# ip rule show
0: from all lookup local
32766: from all lookup main
32767: from all lookup default
OpenVPN LOG DO CLIENTE
root@DD-WRT:~# cat /var/log/messages | grep openvpn
May 24 15:47:21 DD-WRT daemon.notice openvpn[699]: OpenVPN 2.1.1 mipsel-unknown-linux-gnu [SSL] [LZO2] [EPOLL] built on Aug 12 2010
May 24 15:47:21 DD-WRT daemon.warn openvpn[699]: WARNING: file '/tmp/openvpncl/client.key' is group or others accessible
May 24 15:47:21 DD-WRT daemon.notice openvpn[702]: UDPv4 link local: [undef]
May 24 15:47:21 DD-WRT daemon.notice openvpn[702]: UDPv4 link remote: 87.219.xxx.xxx:1194
May 24 15:47:23 DD-WRT daemon.notice openvpn[702]: [server] Peer Connection Initiated with 87.219.xxx.xxx:1194
May 24 15:47:25 DD-WRT daemon.notice openvpn[702]: TUN/TAP device tun0 opened
May 24 15:47:25 DD-WRT daemon.notice openvpn[702]: /sbin/ifconfig tun0 192.168.66.6 pointopoint 192.168.66.5 mtu 1500
May 24 15:47:26 DD-WRT daemon.notice openvpn[702]: Initialization Sequence Completed
IFCONFIG
root@DD-WRT:~# ifconfig
br0
Link encap:Ethernet HWaddr 00:1D:73:55:1C:A4
inet addr:192.168.2.160 Bcast:192.168.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:14119 errors:0 dropped:0 overruns:0 frame:0
TX packets:10639 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2068891 (1.9 MiB) TX bytes:5382302 (5.1 MiB)
br0:0
Link encap:Ethernet HWaddr 00:1D:73:55:1C:A4
inet addr:169.254.255.1 Bcast:169.254.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
eth0
Link encap:Ethernet HWaddr 00:1D:73:55:1C:A4
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:13136 errors:0 dropped:0 overruns:0 frame:0
TX packets:10847 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2180726 (2.0 MiB) TX bytes:5517739 (5.2 MiB)
Interrupt:4
eth1
Link encap:Ethernet HWaddr 00:1D:73:55:1C:A6
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:210 errors:0 dropped:0 overruns:0 frame:198105
TX packets:3683 errors:14 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:41273 (40.3 KiB) TX bytes:963954 (941.3 KiB)
Interrupt:2 Base address:0x5000
lo
Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MULTICAST MTU:16436 Metric:1
RX packets:28 errors:0 dropped:0 overruns:0 frame:0
TX packets:28 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2034 (1.9 KiB) TX bytes:2034 (1.9 KiB)
tun0
Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:192.168.66.6 P-t-P:192.168.66.5 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:56 errors:0 dropped:0 overruns:0 frame:0
TX packets:62 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:4734 (4.6 KiB) TX bytes:4428 (4.3 KiB)
vlan0
Link encap:Ethernet HWaddr 00:1D:73:55:1C:A4
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:13135 errors:0 dropped:0 overruns:0 frame:0
TX packets:10847 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1944080 (1.8 MiB) TX bytes:5466622 (5.2 MiB)