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Cisco 851 DHCP allocating problem

Posted on 2011-02-19
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Last Modified: 2012-05-11
We have a Cisco 851 router and have started having issues where the router will not allocate IPs. We then have to restart the router to resolve the problem. We have run debug and here is the output. Has anyone ever seen where the pool is empty, if so, why? I set the release time to 6 days, to extend the problem.

003127: *Apr 22 22:44:50.508 PCTime: DHCPD: Sending notification of DISCOVER:
003128: *Apr 22 22:44:50.508 PCTime:   DHCPD: htype 1 chaddr c03f.0e7b.4811
003129: *Apr 22 22:44:50.508 PCTime:   DHCPD: remote id 020a0000c0a8010100000001
0000
003130: *Apr 22 22:44:50.508 PCTime:   DHCPD: circuit id 00000000
003131: *Apr 22 22:44:50.508 PCTime: DHCPD: DHCPDISCOVER received from client 01
c0.3f0e.7b48.11 through relay 192.168.1.8.
003132: *Apr 22 22:44:50.508 PCTime: DHCPD: Seeing if there is an internally spe
cified pool class:
003133: *Apr 22 22:44:50.512 PCTime:   DHCPD: htype 1 chaddr c03f.0e7b.4811
003134: *Apr 22 22:44:50.512 PCTime:   DHCPD: remote id 020a0000c0a8010100000001
0000
003135: *Apr 22 22:44:50.512 PCTime:   DHCPD: circuit id 00000000
003136: *Apr 22 22:44:50.512 PCTime: DHCPD: Allocate an address without class in
formation (192.168.1.0)
003137: *Apr 22 22:44:50.512 PCTime: DHCPD: subnet [192.168.1.1,192.168.1.254] i
n address pool sdm-pool1 is empty.

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Question by:Harold
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Don Johnston earned 250 total points
ID: 34933708
Has anyone ever seen where the pool is empty, if so, why?

You have more devices requesting an address than you have addresses in the pool.

Do a "show ip dhcp pool" and "show ip dhcp binding".

You can try to shorten the lease duration.
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by:Harold
ID: 34938007
donjohnston:

I have check the config of the DHCP. It is set for for the full scope of 254 addresses, with exclusions of 1 - 99 and some printer IPs. There are about 60 nodes on this network, so I don't see how it can be an empty pool.

I have set the release from the standard config of 8 hours to 6 days, to keep this issue from happening as often.

I can change it again but this has made no difference. Just trying to find a fix.
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Assisted Solution

by:Don Johnston
Don Johnston earned 250 total points
ID: 34938172
If you have 155 addresses and only 60 devices then somethings obviously not right. When you get a device that can't get an address, look at the bindings and see what's going on.
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Author Comment

by:Harold
ID: 34942383
I will have to wait until it fails again. Is there something particular to look for?
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Author Closing Comment

by:Harold
ID: 35033217
I ended up upgrading the IOS. It didn't have a problem for a few days, so I upgraded the Firmware on the switches and it has been quiet. I'll see what it does from here.
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