Hey guys, I want my Debian machine to talk directly to the DNS servers I specify, rather than using the DHCP config.
On Windows this is done in the TCP/IP protocol properties dialog, DNS tab. In Debian I have tried using NetManager to add the DNS servers in the order I want them queried, but this gets overwritten every time I change it. I have also tried editing resolv.conf, and it also gets overwritten (well, it's the same thing, I think, if Netman gets its info from resolv.conf).
The reason is that I have bind9 running on the Debian system for LAN lookup, forwarding out to Open DNS. All the LAN clients point to the Debian machine for DNS, with the router as backup. The router is also set to forward out to Open DNS. The idea is to offload all DNS queries from the router unless the Debian machine is down (and has the nice effect of giving me fast, stable resolution of internal LAN client addresses). This works for all clients but the Debian machine itself, which insists on using the router as DHCP instructs.
It's not a huge deal, but I just want to know how to make it work 🙂.
Thanks!
EDIT:
NM, I figured it out. In case some future seeker looks here...
$nano /etc/dhcp3/dhclient.conf
Add the following line after the requests...
supersedes domain-name-servers 127.0.0.1; # <- replace with correct IP
That will always overwrite what the DHCP server sends. If you want to use your DNS specs as primary, and fall back to the DHCP settings, use...
prepend domain-name-servers 127.0.0.1; # <- replace with correct IP
Then $/etc/init.d/networking restart
And you're all set.
On Windows this is done in the TCP/IP protocol properties dialog, DNS tab. In Debian I have tried using NetManager to add the DNS servers in the order I want them queried, but this gets overwritten every time I change it. I have also tried editing resolv.conf, and it also gets overwritten (well, it's the same thing, I think, if Netman gets its info from resolv.conf).
The reason is that I have bind9 running on the Debian system for LAN lookup, forwarding out to Open DNS. All the LAN clients point to the Debian machine for DNS, with the router as backup. The router is also set to forward out to Open DNS. The idea is to offload all DNS queries from the router unless the Debian machine is down (and has the nice effect of giving me fast, stable resolution of internal LAN client addresses). This works for all clients but the Debian machine itself, which insists on using the router as DHCP instructs.
It's not a huge deal, but I just want to know how to make it work 🙂.
Thanks!
EDIT:
NM, I figured it out. In case some future seeker looks here...
$nano /etc/dhcp3/dhclient.conf
Add the following line after the requests...
supersedes domain-name-servers 127.0.0.1; # <- replace with correct IP
That will always overwrite what the DHCP server sends. If you want to use your DNS specs as primary, and fall back to the DHCP settings, use...
prepend domain-name-servers 127.0.0.1; # <- replace with correct IP
Then $/etc/init.d/networking restart
And you're all set.
