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New Member

DHCP PROBLEM ON CAT 3750

Hi.

I am trying to configure my CATALYST 3750 as a DHCP Server.

I need to configure a STATIC DHCP binding between a MAC and a IP address.

I had configure the follow but the PC (winXP)does not get the address from the switch.

With a sniffer I see the DHCP request but there is No reply.

The configuration is:

service dhcp

ip dhcp pool test

host 1.x.1.x.0.0.0

client-identifier 0002.8a96.9fba

default-router 1.1.1.254

what am I missing???

THANKs

12 REPLIES
Purple

Re: DHCP PROBLEM ON CAT 3750

Hi,

Have you configured a VLAN (routed) interface on the switch with a 1.1.1.x address ?

Paresh

Bronze

Re: DHCP PROBLEM ON CAT 3750

Hello,

Microsoft Windows clients require a slight change to the client-identifier, which is prepending a '01' for Ethernet. You might want to try the following:

service dhcp

ip dhcp pool test

host 1.1.1.5 255.0.0.0

-->client-identifier 0100.028a.969f.ba

default-router 1.1.1.254

Regards,

Nethelper

New Member

Re: DHCP PROBLEM ON CAT 3750

used debug ip dhcp, to see if your cisco switch heard the dhcp request.

Regards.

New Member

Re: DHCP PROBLEM ON CAT 3750

Yes,

The switch receives the DHCP request, it can be seen using the debug DHCP and also using a sniffer.

New Member

Re: DHCP PROBLEM ON CAT 3750

I had try it, did not help.

Any other idea?

New Member

Re: DHCP PROBLEM ON CAT 3750

Yes.

interface vlan 1 has the ip address of 1.1.1.254 /8

enabled.

Bronze

Re: DHCP PROBLEM ON CAT 3750

Hello,

can you post the full configuration of the switch, and indicate on which port the client is connected to which the static binding has to be go ?

Regards,

Nethelper

New Member

Re: DHCP PROBLEM ON CAT 3750

Hi.

See the attached file.

The DHCP client is connected to interface fastethernet 1/0/1

Thanks for your help.

New Member

Re: DHCP PROBLEM ON CAT 3750

YES, interface vlan 1 is enabled.

New Member

Re: DHCP PROBLEM ON CAT 3750

Could you post "show vlan bri" and "show int f--"

Thanks

New Member

Re: DHCP PROBLEM ON CAT 3750

Could you post "show vlan bri" and "show int f--"

Thanks

New Member

Re: DHCP PROBLEM ON CAT 3750

Hi

Did you resolve this problem...did you upgrade your IOS because I think there is a bug...

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