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 From:  "Aaron Cherman" <aaronc at morad dot ab dot ca>
 To:  <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] MTU Trouble in FreeBSD 6
 Date:  Fri, 22 Dec 2006 13:20:14 -0700
>> Hey everyone, I just upgraded to 1.3b1.  Once the unit was up and running 
>> I started receiving the same kernel messages as I did when I tried 
>> pfSense in this config.
>>
>> kernel: em0: discard oversize frame (ether type 8100 flags 3 len 1518 > 
>> max 1418)
>>
> <snip>
>> It does not appear that the MTU is actually getting forced.  Again, I had 
>> this issue when I > upgraded to pfSense a while back trying to combat the 
>> lockups.
>>
>
> No, looks like it is getting forced and therefore won't accept
> anything larger than your MTU.  That doesn't affect what your clients
> are sending.
>
> I'm guessing you probably have it set at 1400 because you had MTU
> issues in the past with connections hanging or similar issues that
> used to be common with VLAN's.  What happens if you take that out now?

With those in it does affect traffic a great deal - not a lot passes.  They 
were added due to some traffic having issues with the VLANs - ie. some web 
sites not accessible.  I will change the config and try that CF card when we 
another slow traffic time.


Aaron