DHCP Server Offline.
ean at hedron.org
Fri Jul 15 14:17:58 GMT 2005
On July 15, 2005 10:11 am, Stephan Weaver wrote:
> Hello folks,
> I have a Stand Alone FreeBSD Firewall / Nat / Dhcp Server.
> Everything seems to work fine, up until this morning.
> Users seem to complain they could not get on the network anymore.
> Further investigation revealed the dhcp server could not be contacted.
> Further more, only some of the users were online.
> I am guessing that these clients who were online had an ip address from the
> dhcp server at a previous time and the lease didnt expire as yet.
> And users who were not online, the lease expired and attempted to contact
> the dhcp server and failed.
> I Would appreciate any help or suggestions.
Set the lease expire time to at least 5 days (7 to 10 is better) and the
renewal time to between 4 and 12 hours.
Then setup a dhcp monitoring process that will alert you if it fails to get an
address or renewal.
Make sure you have more addresses available than you ever expect to give out.
I go with 50% more. I've known some admins that want at least double.
> Like what to do in the future incase this happens again.
Setup 2 dhcp servers on the network. If one fails, the other will hopefully
continue to serve addresses. Monitor this one as well.
> I Would like to find out what had happened.
Start reading logs.
> The last thing that i had done to the server was setup, configure and
> install 'ntop';
> dont know if this would cause a problem.
> Thank you in advance.
> Stephan Weaver
> P.S. Please reply to my Directly at @
> stephanweaver at hotmail.com
E-Mail: ean AT hedron DOT org
I am currently looking for work. If you need competent system/network
administration please feel free to contact me directly.
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