On Fri, Sep 18, 2009 at 10:35:32AM -0500, Manish Aggarwal wrote: > HI, > I have a query about the Sequence number in the ESP Header. > If for any packet, the receiver finds the seq number as ZERO, what is the > desired behavior..? > > Should this result in the anti-replay check failure..? > Should this be treated as a corrupted packet..?
Solaris/OpenSolaris treats 0-on-the-wire as an anti-replay failure. Here's the code that does early-replay-checking (i.e. replay checking so obvious you don't need to crunch the authentication algorithm): http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/inet/ip/sadb.c#6156 And here's ESP calling, and bumping the appropriate bean-counters for "early-replay drop": http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/inet/ip/ipsecesp.c#1239 Hmmm, the comment here is quite old. We *do* check for collisions in early-replay, and have since AH/ESP support arrived in Solaris. Must've been a leftover from bringup... Hope this helps, Dan _______________________________________________ IPsec mailing list [email protected] https://www.ietf.org/mailman/listinfo/ipsec
