ARP

[#1]

I have a problem with ARP. When I try ping IP address I have this information in debug and I donn't get IP address, why my router send request to 0000.0000.0000 address instead to ffff.ffff.ffff ?

09:11:29: IP ARP: creating incomplete entry for IP address: 126.x.x.252

interface Vlan221

09:11:29: IP ARP: sent req src 126.x.x.253 0015.fa92.36c5,

dst 126.128.253.252 0000.0000.0000 Vlan221.

[Richard Burts]

Dominik

Some devices recognize 0000.0000.0000 as a broadcast address. There is a bit in the config register of the router that deals with the format of broadcast addresses. What is the setting of the config register on your router?

HTH

Rick

[#3]

Configuration register is 0xF

But for other Ip address request is to FF address

09:40:34: IP ARP: sent rep src 10.92.208.89 0015.fa92.36c1,

dst 10.92.208.89 ffff.ffff.ffff GigabitEthernet1/0/12

[Richard Burts]

Dominik

I notice that the ARP with zero address is associated with a VLAN interface and the ARP that works is associated with a physical interface. I wonder if there is some config difference. Can you post the config? Also what kind of device is this?

HTH

Rick

[gpulos]

your configuration register is not 100% correct.

you need to change this to reflect what you want the router to do. a standard config-register would be something like 0x2102 (try this, it should work fine)

see this link for more info:

http://www.cisco.com/en/US/products/ps5854/prod_configuration_guide09186a00802c35d2.html