Date: Mon, 22 Feb 1999 18:24:07 -0700 From: Wes Peters <wes@softweyr.com> To: Joao Carlos Mendes Luis <jonny@jonny.eng.br> Cc: net@FreeBSD.ORG Subject: Re: IP frags from wcarchive ??? Message-ID: <36D20337.2C1AA00E@softweyr.com> References: <199902222100.SAA02125@roma.coe.ufrj.br>
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Joao Carlos Mendes Luis wrote:
>
> Hi,
>
> Does anybody have a hint on what could cause this ?
>
> Feb 22 17:49:13 madrid /kernel: ipfw: 20150 Reset TCP 209.155.82.18 146.164.53.65 in via ed0 Fragment = 182
> Feb 22 17:49:21 madrid last message repeated 5 times
>
> 209.155.82.18 is wcarchive.cdrom.com, 20150 is my ipfw rule that deny
> every TCP incoming packet for a disallowed (not allowed in a previous
> rule) port. The problem is why is it getting here fragmented. IIRC,
> FreeBSD's TCP has path MTU discovery, right ?
>
> On my side, every hop is an ethernet or fddi, until the international link,
> which has a 1500 byte mtu.
Unless you have absolute control of the routing path, you're highly
likely to encounter one or more routers that are broken with respect
to path mtu discovery.
--
Where am I, and what am I doing in this handbasket?
Wes Peters +1.801.915.2061
Softweyr LLC wes@softweyr.com
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