[dns-operations] dns-operations Digest, Vol 92, Issue 13

Paul Vixie paul at redbarn.org
Thu Sep 12 20:26:40 UTC 2013

Aaron Campbell wrote:
> On 2013-09-11, at 11:50 PM, Paul Vixie <paul at redbarn.org> wrote:
>>> 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?
> 48 is correct for IPv6.  But max IPv4 header size is 60 bytes, plus 8 for UDP is 68.

i apologize for misreading you before. i'm choosing 64 for ipv4 because
most ip headers are not full size, and we have to be able to accommodate
a 512-byte udp payload.
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