[cisco-voip] DHCP not really working

[Patrick Diener]

do the IP Phones get the correct Voice VLAN from the switch? Somehow
it looks like the DHCP request is received on an subinterface with an
IP Address not in the 192.168.42.0/24 range...

Regards
Patrick

On 8/17/07, Kelemen Zoltan <keli at carocomp.ro> wrote:
> Hi!
>
> It's a bit off-topic, however I'm all clueless, so any help would be
> appreciated.
>
> I have a CCME (2811, with 12.4(13r)T), with 7911G phones installed. Two
> VLANs, one for data, one for voice.
>
> The router should be responsible for DHCP for the phones, but it does
> not seem to work - phones already in the network have their IP adress,
> keep their address through a reset, but new phones added to the network
> can't get an IP.
>
> However, more people have access to the router and it is very possible
> it might have been misconfigured.
>
> For starters, I noticed a
>
> no service dhcp
>
> in the running config, so I removed that. The dhcp debug messages began
> to appear, but it seems like the router still can't find "itself":
>
> Aug 17 14:13:41.160: DHCPD: DHCPREQUEST received from client
> 0100.1bd4.60b5.e2.
> Aug 17 14:13:41.160: DHCPD: Finding a relay for client 0100.1bd4.60b5.e2
> on interface FastEthernet0/1.2.
> Aug 17 14:13:41.880: DHCPD: DHCPREQUEST received from client
> 0100.1bd4.609c.cf.
> Aug 17 14:13:41.880: DHCPD: Finding a relay for client 0100.1bd4.609c.cf
> on interface FastEthernet0/1.2.
>
> Here are relevant parts of the configuration:
>
> no ip dhcp use vrf connected
> ip dhcp excluded-address 192.168.42.1 192.168.42.2
> !
> ip dhcp pool ITS
>    network 192.168.42.0 255.255.255.0
>    option 150 ip 192.168.42.1
>    default-router 192.168.42.1
> !
> !
> no ip domain lookup
>
> ......................
>
> any ideas? useful show commands?
> most sh ip dhcp ... commands show nothing, except for
>
> Router#sh ip dhcp server statistics
> Memory usage         23512
> Address pools        1
> Database agents      0
> Automatic bindings   0
> Manual bindings      0
> Expired bindings     0
> Malformed messages   0
> Secure arp entries   0
>
> Message              Received
> BOOTREQUEST          0
> DHCPDISCOVER         0
> DHCPREQUEST          1912
> DHCPDECLINE          0
> DHCPRELEASE          0
> DHCPINFORM           0
>
> Message              Sent
> BOOTREPLY            0
> DHCPOFFER            0
> DHCPACK              0
> DHCPNAK              0
>
> Router#sh ip dhcp pool ITS
>
> Pool ITS :
>  Utilization mark (high/low)    : 100 / 0
>  Subnet size (first/next)       : 0 / 0
>  Total addresses                : 254
>  Leased addresses               : 0
>  Pending event                  : none
>  1 subnet is currently in the pool :
>  Current index        IP address range                    Leased addresses
>  192.168.42.1         192.168.42.1     - 192.168.42.254    0
>
> Thanks,
>   Zoltan
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