Suddenly can't get nameserver resolution on FC21 after ...

[William W. Austin]

I have a Linux workstation with 2 network cards - one to get to the internet (so that I can work remotely from my home office) and one for my local lan (other machines, printers, etc.)

About a week ago I updated it from FC20 to FC21 and had absolutely no problems. Everything was working smoothly and I was able to use both networks with no problems.  Then one of my 2 network cards "died" (SIDS I think) and I replaced it with another of a different model.   I did have to system-config-network-gui to set the network parameters correctly and for two days it ran fine.

However I had a system crash (bad disk) yesterday (user files - nothing related to the system) and after that I replaced the drive and rebooted.  However from that point on I no longer get name resolution from my ISP's 2 name servers.  The new card is still working correctly (and if I know the IP address I can get to my office, web pages, etc.  However if I try to do a ping <host> or nslookup <host> or traceroute <host>, I have to wait until the command times out (or hit delete and kill the command) and eventually I get a variation on "CANNOT CONNECT TO HOST" or some such.

I have checked my ifcfg-* files under /etc/sysconfig/ (all 3 links of each of the 2 nics) and they are unchanged.
My /etc/hosts file is unchanged, and there is nothing in /var/log messages to indicate what the problem is (nor does dmesg show anything unexpected).

In short I have a heavy-duty workstation which should be able to connect to the internet but can't.

Any suggestions will be appreciated, and any requests for further information will be answered.  This one is driving me crazy at this point.

Thanks in advance,
 - wwa
-- 
william w. austin                                     airedad at att.net
"life is just another phase i'm going through. this time, anyway ..."