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Re: MTU problem

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: MTU problem
From: Per Jessen <per@xxxxxxxxxxxx>
Date: Wed, 22 Nov 2006 16:49:09 +0100
Roberto Nibali wrote:

> Salü Per,
> 
> Long time no talk.

Hi Roberto

Yeah, it's been a while - I've been busy getting this LVS setup ready
for prime time. 

> Yes, there's always a chance. You check for SYN/ACK flags and clamp
> mss there, probably killing fragmented packets (which could be
> generated with such things like Word or PDF attachments). I would need
> to take a deeper look at what you've created this time :).

Just what I was hoping for :-)

> The customer is always wrong! Is there a possibility that you do not
> fix this using iptables but by adjusting the route mtu? Could you show
> us the output of:
> 
> ip -o -s -s route show cache

See http://jessen.ch/files/route-show-cache  (this is from real server
4). 

LVS setup - 

one director at 88.198.198.123:25 with 4 real servers via masquerading
over IPIP tunnels.  The tunnels are using 10.0.1.x. 



/Per Jessen, Zürich


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