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1841ARP

we have configured 1841 but after some time we get the arp problem and required to do clear arp.

so we debug the ARP and found the following message.

can any one help me to undersand what this means and how can we solve this ARP issues.

ARP packet debugging is on

*May 25 08:04:25.091: IP ARP: rcvd req src 130.22.236.1 00e0.4c81.86d1, dst 130.22.236.2 FastEthernet0/0

*May 25 08:04:25.091: IP ARP: sent rep src 130.22.236.2 0021.55a3.b8ac,

dst 130.22.236.1 00e0.4c81.86d1 FastEthernet0/0

*May 25 08:05:16.215: IP ARP req filtered src 192.168.0.101 001e.ec71.1686, dst 192.168.0.1 0000.0000.0000 wrong cable, interface FastEthernet0/1

*May 25 08:05:25.091: IP ARP: rcvd req src 130.22.236.1 00e0.4c81.86d1, dst 130.22.236.2 FastEthernet0/0

*May 25 08:05:25.091: IP ARP: sent rep src 130.22.236.2 0021.55a3.b8ac,

dst 130.22.236.1 00e0.4c81.86d1 FastEthernet0/0

*May 25 08:06:25.299: IP ARP: rcvd req src 130.22.236.1 00e0.4c81.86d1, dst 130.22.236.2 FastEthernet0/0

*May 25 08:06:25.299: IP ARP: sent rep src 130.22.236.2 0021.55a3.b8ac,

dst 130.22.236.1 00e0.4c81.86d1 FastEthernet0/0

*May 25 08:06:44.247: IP ARP req filtered src 192.168.0.1 0015.1761.2520, dst 192.168.0.100 0000.0000.0000 wrong cable, interface FastEthernet0/1

*May 25 08:06:49.511: IP ARP: rcvd req src 130.22.120.51 001f.d0e3.d192, dst 130.22.120.21 FastEthernet0/1

*May 25 08:06:49.511: IP ARP: sent rep src 130.22.120.21 0021.55a3.b8ad,

dst 130.22.120.51 001f.d0e3.d192 FastEthernet0/1

1 REPLY
Hall of Fame Super Silver

Re: 1841ARP

Hello Santosh,

it looks like there is a rogue DHCP server giving addresses in the 192.168.0.x range:

there are ARP requests for IP subnet 130.22.236.x on fas0/0

ARP requests for 130.22.120.x on f0/1

but there are also requests for net 192.168.0.x on fas0/1

this is the meaning of:

IP ARP req filtered src 192.168.0.1 0015.1761.2520, dst 192.168.0.100 0000.0000.0000 wrong cable, interface FastEthernet0/1

From IEEE OUI search page

http://standards.ieee.org/cgi-bin/ouisearch

001517 is

001517 (base 16) Intel Corporate

Lot 8, Jln Hi-Tech 2/3

Hope to help

Giuseppe

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