[lug] Debian App DNS Issues

John Starkey jstarkey at breezedev.com
Wed Oct 29 16:51:28 MDT 2008

Nate Duehr wrote:
> Is this a mobile machine, or does it stay on the same network?  DHCP 
> or static?
Static desktop on my SOHO network.
> Ultimately, whatever is in /etc/resolv.conf and /etc/nsswitch.conf are 
> controlling what the DNS resolver on the system is going to give to 
> applications running on it.
Any idea what actually hits those files and sends back to the app 
though? I'm wondering if the vanilla apps are hitting a DNS library  or 
binary other than the ones the Deb repo apps are. As I mentioned 
Iceweasel (Deb's Firefox) works out of the box, but if I install a fresh 
FF download from the site there's no DNS resolution.

So the vanilla apps seem to only care about what /etc/hosts says and 
skip DNS all together.
> I'm curious what IP address your system is trying to resolve from... 
> I've seen some DHCP servers in cheap SoHo routers hand out their own 
> internal address and then try to proxy DNS requests for all the 
> "internal" machines that REALLY suck, performance-wise, and sometimes 
> they're just flat-out broken.
Nah, this is all homegrown BIND9, static IP, etc. But everything is 
point at it being between the app and the OS. The network has 7 servers 
on 3 zones running ~80 VPS's (web development network) that are all 
resolving fine.
> Boil it down to basics.  When it breaks, see if /etc/resolv.conf is 
> correct.  If it's not... that's the troubleshooting target to hunt down.
resolv.conf is static on my machine. I think I remember something 
changing it earlier in the year and I went on a hunting expedition to 
get rid of it.



John Starkey
I just know I'm a better manager when I have Joe DiMaggio in center field. --Casey Stengel

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