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 From:  Andreas Ferrari <aferrari at stasoft dot ch>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Problem with MTU
 Date:  Fri, 07 Jul 2006 11:36:57 +0200
Hir Chris

Chris Buechler schrieb:
> On 7/6/06, Andreas Ferrari <aferrari at stasoft dot ch> wrote:
>> Why do I get still a MTU of 1495 when I set it to 1400??
>> I had set it by hand to 1400.....
> How did you "set it by hand"?  
ifconfig interface mtu size -> (on https://mym0n0.foo/exec.php)

 > Where are you seeing it as 1495?
sorry I mean 1492 (little writing mistake)

I had to set it because a postfix server behind the m0n0wall still gets 
a lot of timeouts.

The mss clamping feature didnt solve my problem..
Only setting it hard with ifconfig (see above) solved the problem... can 
you please explain me that, I'm very confused about that and frustrated 
of solving a broken MTU discovery paths....

 From the M0n0-interface:
If you enter a value in this field, then MSS clamping for TCP 
connections to the value entered above minus 40 (TCP/IP header size) 
will be in effect. If you leave this field blank, an MTU of 1492 bytes 
for PPPoE and 1500 bytes for all other connection types will be assumed.

If I understand that right then a MTU of 1400 should give me a mss size 
of 1360??

> -Chris
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