>Ok.. once and a while when researching mail problems I see a message
>about invalid glue at root from DNSREPORT.COM .. Can anyone enlighten
>me as to what glue at root is,
When DNS returns with a "referral" rather than an "answer", the DNS packet
contains the NS records where the querier should query next, plus the A
records for those same NS records. The A records are the "glue records"
that you need to contact those NS hosts.
Each DNS server has a "root hints" file which is nothing but a "referral"
for the root servers: NS records and A their records. The root hints
file enables "root connectivity" for the DNS machine. Not having a root
hints file causes a DNS to lose root connectivity and be unable to
navigate the DNS namespace by following referralsd to obtain answers from
authoritative nameservers.
Scott will have to explain what "invalid glue at root" is.
>what a customer would need to do to fix it
the DNS admin would fix it.
> and how it might impact mail delivery ?
If a DNS loses root connectivity, it can't answer queries from the mail
server which then can't send mail.
Len
http://MenAndMice.com/DNS-training
http://BIND8NT.MEIway.com : ISC BIND 8.2.4 for NT4 & W2K
http://IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways
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