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IP forwarding issue

romolo82
Altocumulus
Altocumulus

Hi,

I configured an IP forwarding to forward traffic from two sources towards two destinations node.

After adding two static routes towards nodes, I added two VS in IP Forwarding mode, with 0.0.0.0/0 as source and the same address of the destination nodes as destination, and with port 3868 as requested (as in the attached picture). No SNAT, no pool, only two VS in IP Forwarding mode.

Now, from source machines it's no possible to telnet destination nodes on port 3868; pinging the address of destination apparently we reiceve a response, but I have the doubt that the responding address is the VS IP Forwarding of the load balancer and not the destination node.

Have you some idea to help me?

Thank you very much.

1 ACCEPTED SOLUTION

It could be many things like translate address and port not dissabled, asymetric routing, traffic not comming on the right vlan etc.. Just as a test did you create a virtual server as described in https://support.f5.com/csp/article/K7595 under "Emulating stateless IP routing with BIG-IP LTM forwa...

 

Also you may enable tcp rst and do a packet capture on the F5 with nnnp just to see if traffic is reaching the F5 device and if the F5 is dropping it for some reason and also check the /var/log/ltm if there are some errors :

https://support.f5.com/csp/article/K13223

https://support.f5.com/csp/article/K13637

https://support.f5.com/csp/article/K9812

 

View solution in original post

1 REPLY 1

It could be many things like translate address and port not dissabled, asymetric routing, traffic not comming on the right vlan etc.. Just as a test did you create a virtual server as described in https://support.f5.com/csp/article/K7595 under "Emulating stateless IP routing with BIG-IP LTM forwa...

 

Also you may enable tcp rst and do a packet capture on the F5 with nnnp just to see if traffic is reaching the F5 device and if the F5 is dropping it for some reason and also check the /var/log/ltm if there are some errors :

https://support.f5.com/csp/article/K13223

https://support.f5.com/csp/article/K13637

https://support.f5.com/csp/article/K9812