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wifiryan
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Posts: 21
Joined: Sat Sep 17, 2011 7:31 pm

Can only ping 1 direction, but it gets weirder...

Tue Jul 20, 2021 9:45 pm

We use OSPF and are having a strange problem where if a path goes down, sometimes it does not re-route correctly and we have to reboot a router on one end of the VPLS tunnel to fix it.

I noticed one of our routers, 10.200.0.110 cannot ping 10.200.0.240 (another router). But it works the opposite direction, 10.200.0.240 has no problem pinging 10.200.0.110.

Ok, then I try to force the Src. Address to see if I get different results. And magically if I put ANY of the IPs in Src Address then 10.200.0.110 can ping 10.200.0.240 just fine. See attachment.

I cannot figure this out. Why would a regular ping be any different then an advanced ping with "Src Address" entered? All Src addresses, from my address list, can successfully ping.


I feel like if I can sort out this ping issue I can sort out my OSPF issue.
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joegoldman
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Posts: 766
Joined: Mon May 27, 2013 2:05 am

Re: Can only ping 1 direction, but it gets weirder...

Thu Jul 22, 2021 5:01 am

What does your ip route show for that particular route ? Does it specificy a bad src-address? Torch the interface without a src-address and see what src/dst its trying to use.

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