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Dialup into 3620 w/ 24pt MICA can't access MS WWW server with NLB

Unanswered Question
Jun 9th, 2003
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I have users dialing up into a 3620 with a 24 modem MICA board. They access one of the intranet WWW servers as part of their normal duties. The WWW site is actually homes on two servers with microsoft Network Load Balancing set up on the adapters. This is similar to how HSRP is configured.

The problem is that when a dialup user attempts to access the virtual address (through HTTP, Ping, etc), they don't get anything. However, accessing the physical IPs works fine. These users can access any other resource on the network fine as well. Users through our VPN and users on the local LAN don't have any issues with the WWW server whatsoever.

Any ideas on what the cause may be?

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makchitale Mon, 06/09/2003 - 18:20
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On the 3620 do you a see a "ip route x.x.x.x" for the virtual address, ie, can we ping it from the 3620? From the 3620 try an extended ping to the virtual address with different source addresses on the 3620 (maybe the loopback0 if used for ip unnumbered under the interface group-async)

How are ip addresses assigned for the dialup users, locally or do they come in with a static ip address.

If these dialup users can reach else where w/o problems that means we have some routing issue here.

Thanks, Mak.

Robert Milanovich Mon, 06/09/2003 - 18:53
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The only IP ROUTE that I have is to the def gateway. I will try the ping as you recommend to see what it comes back with.

The dialup users get their addresses from a pool of IPs that are on the local subnet.

andifur Tue, 06/10/2003 - 16:53
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I am assuming that your are using multicast for the NLB? If so on every Cisco device you have that needs access to the cluster, you will need to add a static ARP entry.

Go into the NLB manger and grab the cluster mac-address and on the cisco, do the following.

conf t# arp xxx.xxx.xxx.xxx.<----- mac-address (cluster IP address) arpa

This will take care of it for you.


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