DHCP problem
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12-12-2007 04:15 AM - edited 03-05-2019 07:57 PM
hi all,
I am configuring a catalyst 4507 switch as DHCP server , it was working fine but suddenly it stopped distributing dhcp in some pools and still working in others !!
i used clear ip dhcp binding , ireloaded the switch and still having same problem .
using debug ip dhcp server events it gives the following
006853: *Dec 11 14:13:41.859: DHCPD: address pool xyz is empty
configuration
interface vlan 128
ip address 172.20.128.1 255.255.255.0
ip dhcp pool xyz
network 172.20.128.0 255.255.255.0
default-router 172.20.128.1
inter gig7/14
switchport mode access
switchport access vlan 128
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12-12-2007 04:55 AM
Is it possible that all the potential DHCP addresses in the pool are active, even though they are not in the bindings table? When you reboot the switch it will lose its bindings table, unless you keep it on a server as well. But there might still be clients out there that still believe they have a valid lease. So, before the DHCP server allocates an IP address, it will ping it first to make sure it is not accidentally in use already. Could it be it got a ping back for every address in the range?
(Clutching at straws here, but its the best I can think of.)
Kevin Dorrell
Luxembourg
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12-12-2007 05:36 AM
Dear Kevin ,
i tried the command
ip dhcp ping packets 0
to disable pinging but i have the same problem .
also when applying clear ip dhcp binding * , no ips return to the pool , and also the number of pcs in the vlan does not exeed 50 devices .
