I have two physical network (10.100.0.0/16) and (22.214.171.124/8). A Cisco router route the traffic between these networks.
I have a problem on one switch (catalyst 2950) located on the 126.96.36.199/8 network
From this switch, I can ping the machine 10.100.1.50 and 10.100.1.52. Arp table shows :
Internet 10.100.1.52 0 1111.fde7.ac01 ARPA Vlan1
Internet 10.100.1.50 2 1111.fde7.ac01 ARPA Vlan1
1111.fde7.ac01 is the mac address of the router interface.
If I unplug the router and plug it back, arp tables shows :
Internet 10.100.1.52 4 1111.fde7.ac01 ARPA Vlan1
Internet 10.100.1.50 3 2222.0fff.939b ARPA Vlan1
2222.0fff.939b is the mac address of the 10.100.1.50 machine.
Then I cannot ping 10.100.1.50. I have to clear the arp cache to be able to ping the machine again.
What can I conclude ?
I don't have this problem with all the other switch located on the 188.8.131.52/8 network.
Thanks for your help