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In the AD review of the documents for defining Robust Header Compression (ROHC) over IPsec: http://tools.ietf.org/wg/rohc/draft-ietf-rohc-hcoipsec/ I picked up on a issue that has been mentioned before but not really been dealt with. Namely the varying MTU for packets entering this tunnel. So this work is to enable so that ROHC can compress the inner IP, transport, etc headers inside an IPsec tunnel to save bandwidth that way. ROHC is a stateful compression technology which can result in that the headers being compressed can be both slightly bigger as well as much smaller. Thus the effective MTU for a particular packet inside an IPsec tunnel with ROHC varies depending on which packet in a sequence it is. This will create some issues for any path MTU discovery mechanism, where a smaller packet may result in a ICMP TOO BIG while a slightly larger packet doesn't. So I am interested in what issues you see arising with this technology and what you think should be done about it. Cheers Magnus Westerlund IETF Transport Area Director & TSVWG Chair ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: [email protected] ----------------------------------------------------------------------
