[c-nsp] ARP entries from another subnet
Vincent De Keyzer
vincent at dekeyzer.net
Mon May 29 11:00:31 EDT 2006
Hello,
I have the following weird situation:
* two LANs, A and B
* LAN A has IP 10.1.1.0/24
* LAN B has IP 10.2.2.0/24
* def. gateway for LAN A is router Ra = 10.1.1.1
* def. gateway for LAN B is router Rb = 10.2.2.1
* Ra and Rb are connected together via a network (cloud)
* host Ha = 10.1.1.10 is on LAN A
* host Hb = 10.2.2.10 is on LAN B
Now, something went wrong and LAN A and LAN B ended up connected together
(say: a UTP cable between the two switches).
Within the ARP table of Ha, there was an entry for 10.2.2.10 ! So to reach
Hb, it would go directly instead of using its default gateway (Ra).
How did this ARP entry arrive in there?
Vincent
PS: Ha is a Catalyst 2950.
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