Panigari Singh rearranged electrons thusly:
> Why resolving Ipaddress to Name is necessary in DNS? I mean where is it
> required?
resolving forward, or back?
1. You cant go around remembering that hotmail is [whatever] ... and indeed,
www.hotmail.com resolves to at least 7 ips
mallet@mjollnir:~> nslookup www.hotmail.com
Server: rocklines.oyeindia.com
Address: 192.168.1.1
Non-authoritative answer:
Name: www.hotmail.com
Addresses: 64.4.11.135, 216.32.243.7, 64.4.43.7, 64.4.44.7
216.33.238.7, 64.4.10.7, 64.4.11.7
and as for reverse lookups (where nslookup on an ip returns the name) - this
is the PTR record. Several ISPs (like geocities.com for instance) wont accept
mail from an IP with no valid rDNS.
Also it helps verifying that a host is what it claims it is.
--
Suresh Ramasubramanian + mallet<@>efn.org
You spamma my mailbox, I nukea da ass
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