Two IP on host

Two IP on host

Post by irakli_d » Fri, 30 Apr 2004 22:02:47

Hi All

Can someone explain me how browser resolves more than one A record?
we want to implement some kind of redundancy for our webserver, we are
thinking to get Backup line form another ISP. so if first ISP will go
down users will still be able to access the site by second (backup)

If I put two A records in DNS for one host and let's say first A
record IP is down will browser automaticly resolve second A record?

Two IP on host

Post by Kevin D. G » Fri, 30 Apr 2004 22:44:58

Irakli < XXXX@XXXXX.COM > posted a question
Then Kevin replied below:

This won't really work for redundancy, but you will get somewhat of a load
balance, because DNS will use round robin to give out the IP addresses.
Theoretically half of the clients will get one IP address and half will get
the other IP. This works in theory but realistically it won't happen exactly
that way.
There is a way of giving you redundancy, like using a sort of cluster
service, I can't help you with that, but DNS giving out two IP addresses for
the same host will not work for redundancy.

Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
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Two IP on host

Post by irakli_d » Sat, 01 May 2004 17:53:06


Kevin thanks for a response.

I forgot to mention in my prevoius post, that round robin is disabled
on DNS.

Cluster service will be too much for our company, I was looking for
some sort of "poor man's" redundancy. Ok kevin thanks anyway