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Date:      Wed, 16 May 2001 11:22:05 -0400
From:      James Housley <jim@thehousleys.net>
To:        "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: ppp problems on 4.3-RELEASE and PPPoE
Message-ID:  <3B029B1D.FA853EFF@thehousleys.net>
References:  <200105161519.IAA09749@gndrsh.dnsmgr.net>

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"Rodney W. Grimes" wrote:
> 
> Someplace along the network path between the client and server someone
> is probably blocking icmp packets, and thus causing path MTU discovery
> to fail.
> 
> You have a non standard MTU of 1492 on your PPP link, and without the
> ICMP type 3, code 4 packets getting through the windblows box is going
> to use an MTU of 1500.
> 
> Good luck in finding the person dropping ICMP type 3 packets in your
> path, unless it happens to be you....
> 

I know!  That is why the "tcpmssfixup" option was added to ppp and
enabled by default.  With this option the ICMP type 3 and 4 messages
aren't needed.  ppp is suposed to fix the packet size.

Jim
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