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Re: QoS considerations

To: Black_David@xxxxxxx
Subject: Re: QoS considerations
From: Lars Eggert <larse@xxxxxxx>
Date: Thu, 21 Mar 2002 11:53:25 -0800
Cc: ipsec@xxxxxxxxxxxxxxxxx
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Black_David@xxxxxxx wrote:

IPsec currently makes QoS for tunnels somewhat difficult, as RFC 2401 requires copying the DSCP from the inner header to the outer header on tunnel ingress, and discarding it at tunnel egress, even if it's been changed. This is overly severe, and I believe/hope that it will be made more flexible in the new version of RFC 2401.

I can understand why this should be revisited, but it also requires a revision of RFC 2003. RFC 2401 already specifies some incompatible rules (e.g. for DF flag processing) that are in conflict with IPIP encapsulation as standardized in RFC 2003. (See draft-touch-ipsec-vpn-03.txt.) It may be useful to update 2401 and 2003 together.

Lars
--
Lars Eggert <larse@xxxxxxx>               Information Sciences Institute
http://www.isi.edu/larse/              University of Southern California

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