[ale] PPP Perfromance

[Doug McNash]

Some network traffic can't be fragmented but I am drawing 
a blank right now as to what besides ICMP that traffic is.
Packets get fragmented if they enter a network segment 
that has an MTU smaller than the packet size. There is a 
DO_NOT_FRAGMENT flag which if set causes the packet to be 
dropped and and ICMP UNREACHABLE error to be sent back if 
fragmentation is required somewhere along the line.   



On Fri, 31 Oct 2003 05:52:29 -0500
  Geoffrey <esoteric at 3times25.net> wrote:
>Ryan wrote:
>>I thought MRU and MTU were things that ppp negotiates 
>>automatically when
>>bringing the link up. Is there any benefit to forcibly 
>>setting them? Or
>>are they required to give ppp an idea of what to say 
>>during that
>>negotiation?
>
>I'm sure there is some benefit, but I can't point you to 
>any document to prove it.  I can say that back when I was 
>doing virtual office for AT&T, I had a problem getting to 
>a particular company site on the intranet. After much 
>gnashing of teeth, I literally stumbled upon a solution 
>which was to change the mtu.  I don't recall whether I 
>set it higher or lower, but I do know that once I changed 
>it, I was able to get to that site with no problem.
>
>That was a wierd one...
>
>-- 
>Until later, Geoffrey	esoteric at 3times25.net
>
>Building secure systems inspite of Microsoft
>
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--
Doug McNash <dmcnash at yahoo.com>