[ale] DNS

[James P. Kinney III]

On Tue, 2004-09-14 at 22:55, Brandon Colbert wrote:
> I want to be able to setup a redundant Internet connection using two 
> isp. If one link goes down, I want to be able to access the webserver 
> via other link. I know I am going to have to setup ip alias, but how do 
> I setup the round robin DNS or is there an another way to handle this.
You'll need to have primary and secondary resolv.conf files. Most ISP's
don't care if you use a dns that is not theirs, but it may make things
slow.

At any rate, make sure your ISP's are locked to a specific ethernet
card. Now you can use iptable/ipchains to route a specific ISP's DNS
server requests out a specific ethernet card. The reason for the dual
resolve.conf files is so when one goes down (call it the primary dns)
you can script a ping test of the upstream gateway for each node and
reset a link to /etc/resolve.conf based on which ISP node has died. Make
the last entry in each file a DNS server from the other ISP so current
queries can still get handled if the node dies during a DNS request.

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-- 
James P. Kinney III          \Changing the mobile computing world/
CEO & Director of Engineering \          one Linux user         /
Local Net Solutions,LLC        \           at a time.          /
770-493-8244                    \.___________________________./
http://www.localnetsolutions.com

GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7
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