Windows Load Balancing connectivity issue

[Mike Ruiz]

Greetings,
I have configured two servers Win2k SP3+ using the
Network Load balancing service using the instructions for
single NIC. The servers are 172.30.10.179 and
172.30.10.180 respectively, and class B, for their
dedicated IP. They are 172.30.10.181 for their Class C.
They are reachable on all three IP's from that network or
from other subnets in our LAN and on the internet via a
static NAT translation in our firewall.
However, I find that when I, from the Internet, VPN
into my LAN via PPTP or IPSEC that I cannot ping, or
communicate with any of those three IP's at any level. I
have connectivity to all other systems in that subnet and
others when VPN'ed in...

I'm convinced this has something to do with the NLB's
unusual treatment of MAC addresses, GRE, PPTP, etc... but
I'm not sure. Could moving to the two NIC version
provide any solution to this??? If anyone can provide
any insight that would be great.

Mike Ruiz,
ESSE, ACP, A+
Network and Enterprise Systems Engineer
Hobart and William Smith Colleges,
Geneva NY
Ph 315-781-3711
(e-mail address removed)

 

[Michael Holzemer]

Does your VPN terminate on a Cisco device? You may need a static ARP entry.

--
Regards,

Michael Holzemer

Please reply in newsgroup
*************************************************

 

[Vivien Wu [MSFT]]

Hello,

To trouble shooting the ping problem, you can refer to the articles below.

Load Balanced Service May Not Work Properly With IP Fragmentation
http://support.microsoft.com/?id=229064

Diagnoses and Treatment of Black Hole Routers
http://support.microsoft.com/?id=159211

You can also check the following things.

1. The output for "wlbs display"

2. System event log

3. Use Network Monitor to check the trace

812953 HOW TO: Use Network Monitor to Capture Network Traffic
http://support.microsoft.com/?id=812953

For more information about NLB in Windows 2000, check the article below.

http://www.eu.microsoft.com/technet/treeview/default.asp?url=/technet/prodte
chnol/windows2000serv/support/NLBConTb.asp

HOW TO: Configure Network Load Balancing Parameters in Windows 2000
http://support.microsoft.com/?id=303608


Sincerely,

Vivien Wu
MCSA, MCSE2000 and MCDBA2000
Microsoft Partner Online Support


Get Secure! - www.microsoft.com/security

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