From: Dmitry Labutcky <avl@strace.net>
To: netfilter@lists.netfilter.org
Subject: Re: Match DF ( Don´t Fragment) bit
Date: Fri, 25 Apr 2003 12:43:40 +0300 [thread overview]
Message-ID: <200304251243.40088.avl@strace.net> (raw)
In-Reply-To: <Pine.LNX.4.51.0304251108380.9600@dns.toxicfilms.tv>
Hi!
> On Wed, 23 Apr 2003, Mathias Sundman wrote:
> > If a mashine on LocalNet1 sends full size packets (1500b)
> > to a mashine on LocalNet2, it will exceed 1500 bytes
> > when it´s encrypted and sent over the internet. These packets
> > will then be fragmented. This is fine as long as the fragments
> > gets through...
>
> How about using -j TCPMSS --clamp-mss-to-pmtu
> or setting mtu to a lower value to avoid fragmentation ?
But if one or more routers in tracepath does not support pmtu?
Setting mtu to lower is solution, but this not always good idea.
Another solution may be in clear DF flag on forwaders packets.
--
/bye
----------------------------------------------------------------------
Dmitry U.Labutcky System administrator of Swift Trace
mail to: avl@strace.net Simferopol, Crimea, Ukraine
phone: +380-652-516546 Yaltinskaya 20, office 502
next prev parent reply other threads:[~2003-04-25 9:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-23 15:24 Match DF ( Don´t Fragment) bit Mathias Sundman
2003-04-25 9:15 ` Maciej Soltysiak
2003-04-25 9:43 ` Dmitry Labutcky [this message]
2003-04-25 20:00 ` Martijn Lievaart
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