overhead
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...
All round numbers, wrote Dr. Johnson, are false, and these numbers
are very round: A reply packet has a 30-byte
overhead plus the name
of the
service ("_ldap._tcp.example.com" for instance); each
SRV RR ...
...
30 bytes general
overhead
20 bytes for the
query string, "_foobar._tcp.example.com."
...
