I am not sure if this has been discussed before since I have not followed the IPSec mailing list for a while.
I understand from the Internet IP Security Domain of Interpretation for ISAKMP [RFC2407] that the IP Compression (IPComp) transforms define optional compression algorithms that can be negotiated to provide for IP payload compression [RFC2393] and that compression algorithms must be published and in the public domain. I also understand from RFC2394 that the DEFLATE compression algorithm is available publicly, and from RFC2395 that Hi/fn, Inc. holds patents on the LZS compression algorithm and that source and object licenses are available on a non-discriminatory basis.
However, if an IPSec implementation also intends to support IPComp, I could not find in any documents which compression algorithm must be implemented as a minimum in order to support interoperability.
Can someone please tell me which one of these two compression algorithms (i.e. DEFLATE [RFC2394] or LZS [RFC2395]) must be supported as a minimum for interoperability reason if implementing IPComp or if none has been mandated since IPComp interoperability was not a concerned?
Thanks in advance for your answer.
Francois
___________________________________
Francois Rousseau
Director of Standards and Conformance
Chrysalis-ITS
1688 Woodward Drive
Ottawa, Ontario, CANADA, K2C 3R7
frousseau@chrysalis-its.com Tel. (613) 723-5076 ext. 419
http://www.chrysalis-its.com Fax. (613) 723-5078