F5 address conflict detected for problem

Hi all,

I have a weird problem with my F5 boxes. the problem is that F5 internal VLAN takes the IPs of the servers which are behind the F5 and F5 ltm logs is full of these errors:

Oct  8 12:43:34 tmm tmm[1878]: 01190004:4: address conflict detected for 192.168.180.138 (00:21:28:3a:48:9a) on vlan 4090
Oct  8 12:44:00 tmm tmm[1878]: 01190004:4: address conflict detected for 192.168.180.120 (00:21:28:3a:49:1e) on vlan 4090
Oct  8 12:44:38 tmm tmm[1878]: 01190004:4: address conflict detected for 192.168.180.108 (00:21:28:3f:a1:3e) on vlan 4090
Oct  8 12:44:40 tmm tmm[1878]: 01190004:4: address conflict detected for 192.168.180.123 (00:21:28:3a:50:46) on vlan 4090
Oct  8 12:45:10 tmm tmm[1878]: 01190004:4: address conflict detected for 192.168.180.117 (00:21:28:3a:48:c2) on vlan 4090

These IP addresses in the logs are belong to the servers behinf the F5 but somehow F5 claims that they are IPs on F5.

When I run the command "arp -a", I got the following output below. the mac addresses linked with IP addresses below must be the server's mac addresses.
? (192.168.180.135) at 00:01:D7:A2:8A:02 [ether] on internal
? (192.168.180.120) at 00:01:D7:A2:8A:02 [ether] on internal
? (192.168.180.117) at 00:01:D7:A2:8A:02 [ether] on internal
? (192.168.180.138) at 00:01:D7:A2:8A:02 [ether] on internal

all IP addresses belong to servers not F5 LTM seems like IP addresses on F5, A2.8A.02 is the mac address of internal interface of F5.

this situation causes my IPMP configuration not to work and makes my servers unreachable.

does anyone have an idea what would make F5 to behave in this way?

br
//sezen

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