[ILUG] ARP Insanity!

[Nick Murtagh]

Hi!


I've moved an IP address from server A to server B.

Server A is still responding to ARP requests for the IP address!

The interface on Server A that had the IP address has been removed,
and networking has since been restarted. No software is listening on
that IP address.

Both servers are Ubuntu Breezy.


On Server A:

# netstat -anp -A inet | grep 10.2.1.230
#


Also on Server A:

# ip addr
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
     inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
     link/ether 00:14:22:b0:5e:80 brd ff:ff:ff:ff:ff:ff
     inet 10.2.1.15/24 brd 10.255.255.255 scope global eth0
     inet 10.2.1.231/24 brd 10.255.255.255 scope global secondary eth0:0
     inet 10.2.1.16/24 brd 10.255.255.255 scope global secondary eth0:1
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
     link/ether 00:14:22:b0:5e:81 brd ff:ff:ff:ff:ff:ff
#


 From a third machine:

# arping 10.2.1.230
ARPING 10.2.1.230 from 10.2.1.22 eth0
Unicast reply from 10.2.1.230 [00:14:22:B0:5E:80]  0.833ms
Unicast reply from 10.2.1.230 [00:20:ED:79:2F:70]  0.920ms
Unicast reply from 10.2.1.230 [00:20:ED:79:2F:70]  0.644ms
Sent 2 probes (1 broadcast(s))
Received 3 response(s)
#


Any ideas? I must be missing something obvious...


Nick