iptables não permitindo pacotes de saída em 1194

Question

Estou tentando configurar o openvpn e estou fazendo um bom progresso.

Ainda não estou no ponto em que estou testando o túnel. Em primeiro lugar, estou certificando-me de que as portas estejam todas configuradas corretamente por meio do firewall.

Se eu fizer o telnet da porta 1194 para o servidor com o iptables ligado e executar o tcpdump, obtenho:

22:39:28.933049 IP xxx.56236 > ip.openvpn: S 4157464468:4157464468(0) win 8192 <mss 1460,nop,nop,sackOK>
22:39:28.934723 IP ip.openvpn > xxx.56236: R 0:0(0) ack 4157464469 win 0

Mas se eu ativar o iptables de volta, ele só parece pegar o pacote, mas não envia uma resposta:

22:39:28.933049 IP xxx.56236 > ip.openvpn: S 4157464468:4157464468(0) win 8192 <mss 1460,nop,nop,sackOK>

Alguma idéia por quê? Meus iptables são assim:

[root@westc01-01-01 sysconfig]# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
RH-Firewall-1-INPUT  all  --  anywhere             anywhere

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
RH-Firewall-1-INPUT  all  --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain RH-Firewall-1-INPUT (2 references)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             anywhere            tcp multiport ports http
ACCEPT     tcp  --  anywhere             anywhere            tcp multiport ports https
ACCEPT     tcp  --  anywhere             anywhere            tcp multiport ports submission
ACCEPT     tcp  --  anywhere             anywhere            tcp multiport ports imap
ACCEPT     tcp  --  anywhere             anywhere            tcp multiport ports imaps
ACCEPT     tcp  --  anywhere             anywhere            tcp multiport ports smtps
ACCEPT     tcp  --  anywhere             anywhere            tcp multiport ports smtp
ACCEPT     tcp  --  anywhere             anywhere            tcp multiport ports ms-wbt-server
ACCEPT     tcp  --  anywhere             anywhere            tcp multiport ports 8884
ACCEPT     udp  --  anywhere             anywhere            udp multiport ports domain
ACCEPT     tcp  --  anywhere             westc01-01-01.local tcp multiport ports ndmp
ACCEPT     gre  --  anywhere             anywhere
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:pptp
ACCEPT     all  --  anywhere             anywhere
ACCEPT     icmp --  anywhere             anywhere            icmp any
ACCEPT     esp  --  anywhere             anywhere
ACCEPT     ah   --  anywhere             anywhere
ACCEPT     udp  --  anywhere             224.0.0.251         udp dpt:mdns
ACCEPT     udp  --  anywhere             anywhere            udp dpt:ipp
ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ipp
ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED
ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ssh
REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited
ACCEPT     udp  --  anywhere             anywhere            state NEW,RELATED,ESTABLISHED udp dpt:openvpn

    

Answer 1

Por que não mudar a ordem dessas regras?

REJECT     all  --  anywhere             anywhere            reject-with icmp-host-prohibited
ACCEPT     udp  --  anywhere             anywhere            state NEW,RELATED,ESTABLISHED udp dpt:openvpn