Re: [lvs-users] Real server not responding back

To: Julian Anastasov <ja@xxxxxx>
Subject: Re: [lvs-users] Real server not responding back
Cc: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
From: Nick Wilson <vicnickw@xxxxxxxxx>
Date: Fri, 3 Apr 2020 01:27:21 +1100
Hi Julian,

>        I have an old document for tunnel troubleshooting. I just added
> > some configuration examples including recently supported tunnel modes,
> HTH:
> >
> > <>
> >
> > At the moment with LVS, VIP on the real-server is not set to the loopback
> > interface but the tunl0 interface.
> >
> >         It works, as long as tunl0/hidden is set to 1, if this flag is
> > used to stop ARP replies. Otherwise, the recommended device for VIPs
> > is lo.
> >

Thanks a lot for sharing that how-to document. It was pretty clear and

I followed the document to setup LVS once again from scratch, but
unfortunately it didn't resolve the response issue :(

This time I tried binding the VIP on 'lo' interface instead of 'tunl0' on
the real-server, and still bring tunl0 up as in your doc, but no luck.

All the troubleshooting steps in your doc, like 'ip route get...' resolve

I don't see any IPIP packet decoding happening on the real-server when I do
a tcpdump. Here's how it looks:

tunl0: CIP -> VIP (packet length 40; checksum correct)
ens3: VIP -> CIP (packet length 0; checksum correct)

This goes on for 4-5 times until timeout on the client.

Anyway, please share if anything else comes to your mind.

Have a good day.


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