On Fri, Aug 3, 2012 at 2:15 PM, Konstantin Olchanski <[log in to unmask]> 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.