June 2018
Intermediate to advanced
368 pages
11h 1m
English
Content preview from Managing Mission - Critical Domains and DNS
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Debugging under anycast
Debugging under anycast can be tricky ,since there are multiple nodes that could potentially reply to given queries. If what you are debugging is an out-of-sync node, you have to find it.
You can use the existing convention of querying for bind.hostname, which can be configured explicitly to any arbitrary string (it defaults to the result of a call to gethostname() otherwise):
(toronto shell)$ dig @f.root-servers.net CH TXT hostname.bind +short "YYZ.cf.f.root-servers.org"(tokyo shell)$ dig @f.root-servers.net CH TXT hostname.bind +short "ICN.cf.f.root-servers.org"
The non-BIND specific ID.SERVER label was later specified, which accomplishes the same thing:
(toronto)$ dig @f.root-servers.net CH TXT id.server +short ...
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