On 4/28/2015 11:49 AM, Tom Herbert wrote: >> If you examine the first 4-bits of the IP field, you will: >> > >> > - work with any IP version in the future >> > - no need new GUE codepoints for new IP versions >> > >> > If you keep duplicate information in the header, you will: >> > >> > - need to explain what you do when the two fields >> > do not match >> > >> > - still need to check the first 4 bits of the IP >> > header anyway > > We've already been handling these case for more than twenty years in > having two Ethertypes for IPv4 and IPv6. This is not a new issue for > the implementation.
The rationale for ethertypes was hardware. That was a bad justification then (esp. because it was transient, depending on hardware capability at the time). Again, let's not make the same mistake again and again and again. Joe _______________________________________________ Int-area mailing list [email protected] https://www.ietf.org/mailman/listinfo/int-area
