On 4/27/2015 5:11 PM, Tom Herbert wrote: > On Mon, Apr 27, 2015 at 4:33 PM, Joe Touch <[email protected]> wrote: >> >> ...
>>> Without any optional fields or flags, the difference with GUE is an >>> additional four byte header between the UDP header and the >>> encapsulated IP header. For IPv4 that header is 0x00040000, and for >>> IPv6 the header is 0x00290000. These should be the same bit pattern in that case. ... >> Does GUE actually treat the contents differently based on the type of >> packet *while in transit*? If not, then, IMO, it'd be better to drop >> those unnecessary 4 bytes. >> > They're not unnecessary! GUE defines a protocol header, and my example > was to demonstrate the bare minimum header to just do IP-in-UDP. The > other bits provide the extensibility for fragmentation, checksum, > virtual networking, security, etc. and also the protocol number (GUE > can encapsulate anything that can be expressed as an IP protocol). See > draft-ietf-nvo3-gue-00. But you have still not explained how GUE treats IPv4 and IPv6 differently on-path. If not, then those bits aren't needed in the GUE header to differentiate between IPv4 and IPv6. Joe _______________________________________________ Int-area mailing list [email protected] https://www.ietf.org/mailman/listinfo/int-area
