On Fri, Aug 3, 2012 at 2:15 PM, Konstantin Olchanski <olcha...@triumf.ca> wrote: > On Thu, Aug 02, 2012 at 06:51:11PM +0000, Adam Bishop wrote: >> Yesterday afternoon the core router on our network decided to have a short >> nap and stopped routing packets for an hour or so. Layer 2 connectivity was >> not affected. >> >> As the DHCP server is on a different VLAN to most of my SL servers, a few of >> them were unable to renew their DHCP leases. > > > If you are using SL6 and the NetworkManager: > https://bugzilla.redhat.com/show_bug.cgi?id=829499
If you're using NetworkManager for *anything* on a server, don't. It's fragile and destabilizing. Its main use is in highly dynamic environments, such as laptops hopping from access point to network to VPN to local wire connection to modem to who knows what. I find it safest to simply delete it, but if you've software that demands NetworkManager, use "/sbin/chkconfig off NetworkManager" to disable it and put 'NM_CONTROLLED=no' in your /etc/sysconfig/ifcfg-* files to block it, even if it's accidentally run.
