From: <vpp-dev@lists.fd.io> on behalf of chetan bhasin
<chetan.bhasin...@gmail.com>
Date: Tuesday 17 November 2020 at 12:27
To: "Neale Ranns (nranns)" <nra...@cisco.com>
Cc: vpp-dev <vpp-dev@lists.fd.io>
Subject: Re: [vpp-dev] Facing issue Ipv6 routing (Vpp 1908)
Hi Neale,
Thanks for your response!
Note - This issue is not reproduced in labs but coming in one of our deployment
sites.
Ah well, if it’s in deployment and not your labs, then it’s probably the
polarisation frequency of the flux capacitor 😉
Let me explain the issue -
Client <------------> SUT(VPP 19.08 + our customized plugins)
<-------------------->Server
While sending icmpv6 (Echo Request) from client towards server , sometimes that
Request comes out from the wrong interface. ie
Client <------------> SUT(VPP 19.08 + our customized plugins)
<-------------------->Server
-----ECHO Request-->
-<----ECHO Request—
Request or reply here? Is it VPP’s echo response that is not forwarded
correctly?
Again, you have to time me more about ‘sometimes’. What are the conditions that
are different. For example, the patch you first pointed to might be an issue if
you happen to be adding/deleting routes when the reply is sent.
- Are we aware about any such known issues ?
-Suggest anything we should look into out-of-tree plugin code , which could
narrow down the issue.
A packet trace of the working and non-working case would certainly help. Plus
the output of ‘sh ip6 fib’ so we can try and determine which route it is using.
/neale
Thanks,
Chetan Bhasin
On Tue, Nov 17, 2020 at 3:59 PM Neale Ranns (nranns)
<nra...@cisco.com<mailto:nra...@cisco.com>> wrote:
Hi Chetan,
I think you’ll have to expand a bit on ‘sometimes’ for us to help. Under what
conditions does this happen?
/neale
From: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>
<vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>>
Date: Tuesday, 17 November 2020 at 07:40
To: vpp-dev <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>>
Subject: [vpp-dev] Facing issue Ipv6 routing (Vpp 1908)
Hello Everyone,
We are facing an issue with respect to ipv6 fib lookup (Vpp-1908).
Sometimes a packet comes out of the wrong interface , looks like due to wrong
fib lookup.
I have found one change which is not part of our code
https://gerrit.fd.io/r/c/vpp/+/27255
Can anybody please suggest , is that change could cause such a problem ?
Thanks,
Chetan Bhasin
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