Nameserver records outside current domain
Len Conrad
LConrad at Go2France.com
Thu Jun 28 17:54:12 UTC 2001
>Was looking at my DNS records
uh oh :)))
>In a multiple-domain hosting environment, where the primary domain is
>foo.com. The entry for bar.com has:
>@ IN NS ns1.foo.com
>@ IN NS ns2.foo.com
>
>Now since all the other records in this bar.com domain all resolve to IP
>addresses, how does the NS records resolve to an IP? Does it have to do
>another lookup for foo.com to find these?
When a DNS queries the .com parent for bar.com, the .com parent returns a
"referral" that looks like this:
;delegation data
bar.com. Ns ns1.foo.com.
bar.com. NS ns2.foo.com.
;glue records
ns1.foo.com a ip.ad.re.ss
ns2.foo.com a ip.ad.re.s2
The querier doesn´t have to resolve the ns ip´s, they are in the
"additional section" of the referral.
Len
http://MenAndMice.com/DNS-training
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