topic Re: How many DHCP bindings are in use? in General Topics

How many DHCP bindings are in use?

steveo — Mon, 31 Mar 2014 16:29:17 GMT

All,

I've been digging around and as far as I can tell there isn't a way to just show me how many DHCP bindings are currently in use, is there?

I have interfaces that are serving up /21's of addresses and I'd love to be able to just run a quick command telling me: There are 567 addresses in use out of 2000 or a % or something. As far as I can tell the only thing you can do is just show me a HUGE list of all the IPs which is pretty useless besides knowing a lot of people have addresses..

Thanks!

Re: How many DHCP bindings are in use?

gwesson — Mon, 31 Mar 2014 16:47:35 GMT

Hello,

> show dhcp server lease all | match pool

This will output the leases, but only match lines with "pool" in the name. A sample output is:

> show dhcp server lease all | match pool

Allocated IPs: 0, Total number of IPs in pool: 26. 0.0000% used

Allocated IPs: 7, Total number of IPs in pool: 21. 33.3333% used

Hope this helps,

Greg

Re: How many DHCP bindings are in use?

steveo — Mon, 31 Mar 2014 17:24:09 GMT

Hmmmm.. Is this maybe a 5.1 or 6.0 feature? We're currently running 5.0.6 and if I just run the command:

show dhcp server lease all

I get a listing of bindings, however I don't see anything that says 'pool' so if I run the full command:

show dhcp server lease all | match pool

It matches nothing so it doesn't show me anything..

Thanks!

Re: How many DHCP bindings are in use?

gwesson — Mon, 31 Mar 2014 21:28:20 GMT

Sorry about that, my firewall is running 6.0.1 and I assumed it would be the same on a 5.0 box as well. It looks like the 'pool' output was added to the 6.0 version, so that's a new feature. There is no feature in 5.0 that would give you a summary from what I could find.

Your best bet would be to turn on logging in your SSH program, turn off CLI paging (set cli pager off), then do a grep -c or something similar to count the number of lines you got that match your /21 (cat output.txt | grep -c 172.16.).

Once you're ready to upgrade to 6.0, you can use the other command I gave before.

Cheers,

Greg

Re: How many DHCP bindings are in use?

_slv_ — Tue, 01 Apr 2014 07:24:13 GMT

On 5.0.9 You can use:

admin@PA-200> show dhcp server lease ethernet1/4.31 | match committed

My question is - is it possible to monitor by SNMP? (on 5.x or 6.x)?

Regards

Slawek