>From draft... However, some intermediate nodes such as firewalls, may need to look at the transport layer header fields in order to make a decision to allow or deny the packet. If new extension headers are defined and the intermediate node is not aware of them, the intermediate node cannot proceed further in the header chain since it does not know where the unknown header ends and the next header begins.
If intermediate node is not aware of the protocol number, it cannot skip over the "extension", because it doesn't know it is an extension header in the first place. The standard format might make it a little bit easier to implement skipping, after you have updated the software on intermediate node to recognize the new protocol number as an extension header number. -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
