It is possible to have multiple A records for the same host.
check out www.ibm.com
$nslookup www.ibm.com
Server: gnsc3ms.sutterhealth.org
Address: 10.1.50.25
Non-authoritative answer:
Name: www.ibm.com
Addresses: 204.146.81.99, 204.146.80.99
ANSWERS:
-> www.ibm.com
type = A, class = IN, dlen = 4
internet address = 204.146.81.99
ttl = 23315 (6h28m35s)
-> www.ibm.com
type = A, class = IN, dlen = 4
internet address = 204.146.80.99
ttl = 23315 (6h28m35s)
and our beloved
$nslookup www.microsoft.com
Server: gnsc3ms.sutterhealth.org
Address: 10.1.50.25
Non-authoritative answer:
Name: microsoft.com
Addresses: 207.46.131.137, 207.46.131.28, 207.46.131.30, 207.46.130.14
207.46.130.149, 207.46.130.150, 207.46.130.45
Aliases: www.microsoft.com
QUESTIONS:
microsoft.com, type = A, class = IN
ANSWERS:
-> microsoft.com
type = A, class = IN, dlen = 4
internet address = 207.46.130.150
ttl = 9595 (2h39m55s)
-> microsoft.com
type = A, class = IN, dlen = 4
internet address = 207.46.130.45
ttl = 9595 (2h39m55s)
-> microsoft.com
type = A, class = IN, dlen = 4
internet address = 207.46.131.137
ttl = 9595 (2h39m55s)
-> microsoft.com
type = A, class = IN, dlen = 4
internet address = 207.46.131.28
ttl = 9595 (2h39m55s)
-> microsoft.com
type = A, class = IN, dlen = 4
internet address = 207.46.131.30
ttl = 9595 (2h39m55s)
-> microsoft.com
type = A, class = IN, dlen = 4
internet address = 207.46.130.14
ttl = 9595 (2h39m55s)
-> microsoft.com
type = A, class = IN, dlen = 4
internet address = 207.46.130.149
ttl = 9595 (2h39m55s)
The example with IBM shows the 2 A records. www.microsoft.com is an alias
to microsoft.com which as you can see has many A records. This allows for
high availability and round robin of all the hosts, since the cost is all
the same.
Andrew
-----Original Message-----
From: Sean-Paul Rees [mailto:sean@dreamfire.net]
Sent: Saturday, January 08, 2000 2:59 PM
To: lug-nuts@saclug.org
Subject: [lug-nuts] DNS Problem
I have DNS setup on my network server at home. A friend of mine says
that having two+ A records per IP breaks a standard. However, I disagree
with him.
Any ideas?
Cheers,
Sean
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This archive was generated by hypermail 2b29 : Fri Feb 25 2000 - 14:29:10 PST