Notification if DHCP-pool gets depleted? (pf 2.1.5)

iorx

Hi!

Got a case where I'm not really sure if the address pool is big enough.

So the questions:

Can I get a Notification (the built in pf-function) when the pool of addresses is depleted?
What should I look for in the DHCP-log?
Any monitoring I could use to get a better picture of the DHCP leases?

Brgs,

jimp

There isn't a way to be notified currently, but what you're looking for in the DHCP log would be something along the lines of "no free leases"

Similar to:

dhcpd: DHCPDISCOVER from xx:xx:xx:xx:xx:xx via em0: network y.y.y.0/24: no free leases

There aren't any monitoring options for pool utilization currently.

iorx

I'm noob here it feels like. Can I see further back in dhcpd-log? Can find the log file.

phil.davis

The webGUI log display show however many lines you have set it to display.
The whole log is in /var/log/dhcpd.log
From command line:

clog /var/log/dhcpd.log

will spew out all the content.
You can "grep" for what you like.

iorx

Thank you!
Of course in /var/log … ::) But no "no free leases" found in the file.

Though, I could only see like 2 days back, the logs are trunked at 512KB it looks like. Anyway possible to increase this? Googled a bit on this but didn't find what, where or how to do it.

Next step is to figure out a way to trigger some kind of alert if it runs out of addresses.

jimp

If you are on 2.2, the size of the log file may be increased on the Settings tab under Status > System Logs.

iorx

Thank you sir! A great incentive to upgrade to 2.2.

I have to convince the customer of that this is a good thing to do now. Currently running 2.1.5 with a couple of VLAN, site-to-site IPSEC and OpenVPN connections.
Upgrade and at the same time take them from a /24-subnet to a /16. Internal address space is for the moment 10.200.100.0/24 and i don't see anything that's in the way for that to become /16.

Brgs,