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 From:  John Crowley <jcrowley at gmx dot net>
 To:  Michael Brown <knightmb at knightmb dot dyndns dot org>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Trouble with ADSL+2
 Date:  Wed, 21 Jun 2006 21:46:15 +0200
I will contact my ISP tomorrow allthough I found out a MTU of 1488 is
best to go.

Thanks!

Michael Brown wrote:
> I think his ISP should be able to provide him with their MTU settings. 
> That way he won't have to guess and test to find the best one.  Another
> way to know when it's broken is to ping with the no fragment flag set
> and packet sizes set to 1400 and above.  If the ping breaks after a
> certain MTU then that's as high as the packet size can get before it's
> chopped up.  In this case, probably faster just to set the MTU and ping
> until you find the largest number that will work instead of waiting for
> the ISP to give a response unless it's easy to get their tech support on
> the phone.
> 
> Thanks,
> Michael
> 
>>
>> Yes.  1400 is just a good number to test with.  Using the highest
>> possible MTU with things still working will give you very slightly
>> better performance (slightly fewer packets on large transfers).  I'd
>> try 1460 next, if that works, try going up by 10 until it breaks, then
>> back down until you find the sweet spot.  I'm not familiar with ADSL2,
>> nor German Internet services, so don't know what the ideal MTU would
>> or might be.
>>
>> -Chris
>>
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