CSS sending out ICMP redirect

[zhichao]

We have a CSS configured as IP address 10.88.2.31, 10.88.2.56 configured as VIP.

From the sniffer trace, it is sending icmp redirect to the clients accessing the VIP 10.88.2.56.

Following is the message:

icmp redirect ignored if=sbif2 src=10.88.2.31 dst=10.88.2.9 gw=10.88.2.56 code=1 orig_src=10.88.2.9 orig_dst=10.88.2.56

[Gilles Dufour]

what's the arp entry on your client for both ip addreses ?

The physical interface ip and the vip should have

different mac address.

If your client uses the same mac address for both, the css will send a redirect to correct the client.

Gilles.

[zhichao]

the client did not configure any arp entry on its PC.

thanks

[Gilles Dufour]

do a 'arp -a' and see the actual arp database.

Maybe the pc does not use the right mac address.

Also, what CSS model are you talking about and what software version.

Thanks,

Gilles.

[zhichao]

Hi Gilles

You are right. ARP -A shows the client has the same MAC addresses for the physcial and VIP addresses.

Is this the CSS problem or normal behavior?

FYI, it is a CSS11050 running ap0500002 (5.00 Build 2).

[Gilles Dufour]

Could be a CSS issue.

Upgrade to the latest build 5.0(2.04)

You can find it at :

http://www.cisco.com/cgi-bin/tablebuild.pl/webns-maint

If the problem is still there after that, this would be a client side issue.

BTW, you can see exactly who is at fault by capturing a sniffer trace on the client, then clear the arp entry on the client and ping the vip and see what the CSS replies to the arp request.

Gilles.