Aaron Campbell wrote:
> On 2013-09-11, at 2:30 AM, Paul Vixie <p...@redbarn.org> wrote:
>
>> "A DNS UDP responder shall, when transmitting a message which does not
>> include embedded cryptographic marks such as TSIG or DNSSEC signatures, use
>> an effective DNS message payload size which is calculated as MIN(OFFERED,
>> MIN(DISCOVERED, ESTIMATED) - OVERHEAD)) where OFFERED is the EDNS BUFSIZE
>> received from the initiator, and DISCOVERED is the path MTU if known or else
>> the outbound interface MTU, and ESTIMATED is chosen as 576 for IPv4 or 1280
>> for IPv6 as the minimum guaranteed size of an IP datagram, and OVERHEAD is
>> chosen as 64 for IPv4 or 48 for IPv6 as the maximum likely size of the IP
>> and UDP headers.
>
> Shouldn't OVERHEAD actually be 68 for IPv4?
i am counting 40 for the ipv6 header and 8 for the udp header. where are
you getting your 68 number from?
> Also, already mentioned in 2671bis, but OFFERED shouldn't be used unless it
> is at least 512. ("Values lower than 512 MUST be treated as equal to 512.")
a fine plan. orange, can you produce an EDNS0-ter draft along these lines?
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