> -----Original Message----- > From: Vishwas Manral [mailto:[EMAIL PROTECTED]
> How can a node know it is a new Extension Header (which follows the > format as specified in the new draft) or another upper layer protocol? > There can be two unknowns - unknown upper layer protocol and unknown > EH. > > Say if we get a value of x, which is unknown in the Next Header field, > there is no way we can assume the next header is either EH or an upper > layer protocol. So there is no way to say the Next Header follows the > format as specified in the EH. Hi Vishwas, Remember that the motivation for this draft is firewalls. So, if the firewall uses the EH Length field to hop down all unknown headers, but in doing so it never reaches a known "next header" value, presumably that firewall should discard the packet. In other words, unkown upper layer protocols would be reason enough to block such a packet. Bert -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
