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,