[Cialug] DNS Issues

[Stuart Thiessen]

One thing I remember that I changed yesterday that may have affected 
things ... Hmmm.  This machine has only 1 NIC. I set up an alias IP 
address so that I could configure PostFix to allow internal users to 
use the alias address for unfiltered SMTP and then when the firewall 
forwards email from the outside, then it can go to the regular IP 
address to be filtered and run through SpamAssassin.  Now, I thought I 
configured things properly through YAST which should have set it up 
fine.

I noticed my routing table has the following:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use 
Iface
192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 
eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 
eth0
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0 
lo
0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0 
eth0

I do not have any network on 169.254.0.0.  Could it be that all of my 
traffic is going to 169.254.0.0?  Would that be able to find the 
gateway?  If 169.254.0.0 is representing my alias address, then I am 
confused because I did set the alias address with an address local to 
the 192.168.0.0 network. I can ping it and such with the designated 
192.168.0.xxx address.

Any ideas on how I could troubleshoot this?

Stuart

On Aug 23, 2005, at 18:22, Stuart Thiessen wrote:

> I understand the question. :)
>
> Well the funny thing of all of this is that the rest of the network's 
> users are having no problem.  This Linux server that is giving me 
> problems is able to receive and process email, and do everything fine 
> except for the fact that it cannot see outside of the local network. I 
> ran a test by running a ping on www.yahoo.com and then put the ip 
> address and www.yahoo.com in my /etc/hosts file.  It still is unable 
> to do anything with it. So that seems to point to a routing problem.  
> Now, does Linux require a daemon to be running to manage routes?  At 
> this point, I can't see anything running that managed routes, but I 
> did not install anything extra to manage routes.
>
> Hmmmm,
>
> Stuart