Backup DNS Server?

Hopefully some networking guru can help me.

So lately, I've been playing around with server software stuff on Ubuntu to learn more about Linux and, to a certain extent, how the Internet works. I was finally able to set up a zone record (Is that the correct term?) for a domain. Now, I'm wondering what can I do so if the first server gets turned off, there will be another server able to handle the requests.

And I'm not worrying too much about security at the moment, it's just an internal server. I'm using BIND9 on Ubuntu Server 8.10.

#523037

Can't you just setup the second server's BIND9 as backup server?

AFAIK backup servers are part of the DNS standard (search for the RFCs).

#523087

I use BIND9 myself on my network on my server. Basically, when my server goes down, then so does DNS (and DHCP). Makes it a bugger if the server goes down, because so does my whole network.

I think it is possible to set your router to have some DNS entries; I myself have DD-WRT-enabled Linksys routers; where it is possible to do so. Having two DNS servers running on the same subnet might be a little tricky though; as I know that DHCP doesn't work with TCP/IP like that.

#523098

In Windows, you can tell it to use DHCP for the IP address, and at the same time set two fixed DNS servers.

I have never tried to setup a DHCP server to assign more than one DNS to it's clients.

#523154

Machines can have thousands (literally) of CNAMEs directed all to the same IP address.

#523166

Sometimes this problem occurred from IP adress. you can change your IP address with restart modem and then check it. I think it'll be ok.

#525289