[33450] in North American Network Operators' Group
Re: IPIP-tunnel with 1500 MTU
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Thu Jan 11 13:58:14 2001
Message-Id: <200101111856.f0BIuCNo13976@black-ice.cc.vt.edu>
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: nanog@merit.edu
In-Reply-To: Your message of "Thu, 11 Jan 2001 18:44:22 +0100."
<Pine.LNX.4.30.0101111840140.20762-100000@uplift.swm.pp.se>
From: Valdis.Kletnieks@vt.edu
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Date: Thu, 11 Jan 2001 13:56:12 -0500
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On Thu, 11 Jan 2001 18:44:22 +0100, Mikael Abrahamsson <swmike@swm.pp.se> said:
> I would like to tunnel IP packets over an IP network, and this IP network
> has 1500 MTU (regular ethernet MTU). In the cisco tunnel (and most others)
> the tunnel MTU ends up being 1450-something bytes. This is not acceptable,
> I need something that is able to split the packet up into two packets so
> that the tunnel MTU will be 1500.
Why is it "not acceptable"? Can you configure a Path MTU of 1450 to avoid
fragmenting, or run Path MTU Discovery?
--
Valdis Kletnieks
Operating Systems Analyst
Virginia Tech
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