nanog mailing list archives
I-D on operational MTU/fragmentation issues in tunneling
From: Pekka Savola <pekkas () netcore fi>
Date: Mon, 11 Oct 2004 11:12:55 +0300 (EEST)
Hi all, I've written a very short (about 5 pages of meat) Internet-Draft describing the issues and operational approaches to the problems faced with doing tunneling in the network -- as these issues kept coming up again and again with IP-in-IP, GRE, L2TP, etc. The approaches may be different for passive monitoring ('wiretapping' etc.) and 'active' tunneling. The document is about to be IETF Last Called for Informational RFC, but prior to that, I'd like to solicit comments/feedback/review from the people here because I'm 100% sure a lot of people have been faced with these issues (we certainly have..). Please send comments to me by the end of this week, either on- of off-list, as you deem appropriate. Find it at: http://www.ietf.org/internet-drafts/draft-savola-mtufrag-network-tunneling-01.txt Abstract Tunneling techniques such as IP-in-IP when deployed in the middle of the network, typically between routers, have certain issues regarding how large packets can be handled: whether such packets would be fragmented and reassembled (and how), whether Path MTU Discovery would be used, or how this scenario could be operationally avoided. This memo justifies why this is a common, non-trivial problem, and goes on to describe the different solutions and their characteristics at some length. -- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
Current thread:
- I-D on operational MTU/fragmentation issues in tunneling Pekka Savola (Oct 11)
- Re: I-D on operational MTU/fragmentation issues in tunneling Iljitsch van Beijnum (Oct 13)
- Re: I-D on operational MTU/fragmentation issues in tunneling Pekka Savola (Oct 14)
- Re: I-D on operational MTU/fragmentation issues in tunneling Sabri Berisha (Oct 14)
- Re: I-D on operational MTU/fragmentation issues in tunneling Joe Maimon (Oct 14)
- Re: I-D on operational MTU/fragmentation issues in tunneling Sam Stickland (Oct 19)
- Re: I-D on operational MTU/fragmentation issues in tunneling Joe Maimon (Oct 19)
- Re: I-D on operational MTU/fragmentation issues in tunneling Joe Maimon (Oct 14)
- Re: I-D on operational MTU/fragmentation issues in tunneling Mikael Abrahamsson (Oct 14)
- Re: I-D on operational MTU/fragmentation issues in tunneling Andre Oppermann (Oct 14)
- Re: I-D on operational MTU/fragmentation issues in tunneling Sabri Berisha (Oct 15)
- Re: I-D on operational MTU/fragmentation issues in tunneling Iljitsch van Beijnum (Oct 13)
- <Possible follow-ups>
- Re: I-D on operational MTU/fragmentation issues in tunneling Joe Maimon (Oct 15)