Section 2. Delegation Details
The answer section may contain a optional CNAME/DNAME chain.
2.2
TC is set if the answer and authority sections exceed the
message size less the reserved space for TSIG and / or EDNS
responses.
2.6.
The presentation length can be up to 1004 (250*4+4) characters
as there are minimum of 5 labels in a maximum length domain
name. This leaves 250 non label start octets which each can
take 4 presentation character (\DDD), 3 inter-label periods
and a optional final period to distingish between relative
and absolute names.
The network length maximum is 255 not 256.
The worst case question section is 259 octets.
2.11
A NS RR adds at 12 octets (name(2), type, class, ttl, rdlen)
+ NSDNAME (minimum 2, max 255). Assuming in zone nameservers
the that do not match the zone's name you get 16 for [a-z].<zone>.
2.14
First should be all glue which matches the <QNAME,QTYPE>.
TC should be signaled if this can't be added.
This allows a resolver to query for missing glue from a
previous referral and get it by forcing a TCP query.
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: [EMAIL PROTECTED]
.
dnsop resources:_____________________________________________________
web user interface: http://darkwing.uoregon.edu/~llynch/dnsop.html
mhonarc archive: http://darkwing.uoregon.edu/~llynch/dnsop/index.html
