Hi, Brian, On 06/10/2013 10:12 PM, Brian E Carpenter wrote: > Why wouldn't we add a sentence in -oversized-header-chain > following this: > >> 6. Updating RFC 2460 >> >> If an IPv6 packet is fragmented, the first fragment of that IPv6 >> packet (i.e., the fragment having a Fragment Offset of 0) MUST >> contain the entire IPv6 header chain. > > > The entire IPv6 header including the header chain SHOULD NOT exceed > 256 octets. > > (or whatever magic number we decide on).
I fully agree. -- For instance, at least the individual version of this I-D included wording along those lines (at the time, the I-D was required the entire header chain to be within the first 1280 bytes of a packet). > We might need some words to justify that, but they can be found > in this thread. How about something along the lines of: * A large number of deployed systems reportedly drop packets that do not contain the entire IPv6 header chain within the first XXX bytes. * Since extension headers represent overhead to transmission of IPv6 payloads, the IPv6 header chain is expected to be small fraction of a full-sized packet. With an IPv6 minimum MTU of 1280 bytes, a limit of XXX bytes for the entire header chain already allows for YYY % of overhead. (for the first bullet, we could add an informative reference to Warren et al's I-D). Thanks! Best regards, -- Fernando Gont SI6 Networks e-mail: fg...@si6networks.com PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492 -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
