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On Wed, Jul 2, 2014 at 7:19 PM, Nilesh Govindrajan <me@xxxxxxxxxxxx> wrote:
> Hi,
>
> We have a setup - 1 director and 2 real servers and LVS TUN is used
> because they're located at different places.
>
> Now, the problem is that whenever someone tries to upload a large
> image (~400 KB) via CloudFlare, it just gets stuck and fails. The same
> works when I do it directly.
>
> Tried contacting CloudFlare, and they say everything is right on their side.
>
> I suspect this has something to do with LVS Tun. What could be the problem?
>
> Tried setting MTU = 1400 as per
> http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-Tun.html#setting_mtu_by_route
> but that doesn't help either.
Okay some info on the MTU thing, I was seeing ICMP frag required
messages in tcpdump on director.
As per the guide, I changed MTU of outgoing interface on real servers
to 1480 and changed MTU of tunnel to 1500. It stopped those messages
and now I see lot of packets with F flag possibly indicating that
fragmentation works correctly. But uploads still don't work.
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