Two IP on host

  • Thread starter Thread starter Irakli
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Irakli

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)
ISP.

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?
 
In
Irakli said:
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)
ISP.

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?
Click to expand...

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.
 
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.
Click to expand...


Kevin thanks for a response.

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

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.
Click to expand...

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