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DNS Server lost after NAC Upgrade to 6.1.X

DNS Server lost after NAC Upgrade to 6.1.X

Michael_Kirchne
Contributor

‎03-11-2015 01:14 PM

After I upgraded a few NAC Appliances from 5.X to 6.1.X or from 6.1.X to latest 6.1.182 I had sometimes the problem that NAC lost its DNS Server information in the /etc/resolvresolv.conf.

After dnetconfig (without changing something) all worked fine again.

Does anybody know a reason for that? It doen't happen on every appliance.

Best Regards
Michael
10 REPLIES 10

Michael_Kirchne
Contributor

‎04-08-2015 01:43 AM

yes
0 Kudos

James_A
Valued Contributor

‎04-08-2015 01:43 AM

Well, do your appliances have two network interfaces configured, with a gateway in both? Are they the Ubuntu versions?
0 Kudos

Michael_Kirchne
Contributor

‎04-08-2015 01:43 AM

Great - but I just don't get what you mean 
0 Kudos

James_A
Valued Contributor

‎04-08-2015 01:43 AM

I got around to filing 01124098 on this.

0 Kudos

James_A
Valued Contributor

‎04-08-2015 01:43 AM

I see this sometimes on my NAC servers with two NICs. It happens because /etc/network/interfaces has gateway lines for each interface, which causes a hang while the network is being configured, and so the DNS configuration is never set in /etc/resolv.conf. My guess is sometimes dnetconfig has a race condition with this which is why it only works sometimes. I've been meaning to file a bug on this but haven't got around to it.
0 Kudos
GTM-P2G8KFN