RHEL 6 gateway config

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Hi,

 

I am trying to configure a RHEL 6 server as a gateway to the internet for an inner server.

 

The gateway server (server1) has 2 NICs:

 

em1 192.168.168.56/24

em2 20.249.6.135/24

default gateway 192.168.168.254

 

The inner server (server2) has:

 

eth1 20.249.6.136/24

default gateway 20.249.6.135

 

I have forwarding allowed:

# cat /proc/sys/net/ipv4/ip_forward
1

# iptables -L -n -v

Chain FORWARD (policy ACCEPT 79 packets, 6636 bytes)

 

I can ping and ssh from server1 to server2, and vice-a-versa.   I cannot ping the ultimate gateway and beyond 192.168.168.254.

 

You can see from the FORWARD accept packets that the pings are arriving at server2.

 

I have tried to configure SNAT with this unsuccessfully:

 

iptables -t nat -A POSTROUTING -o em1 -j MASQUERADE

 

Thanks for any help you can provide.

PD

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