Hi,
I have just tried to configure 2 node Windows 2008 NLB cluster and I run
into problem.
Until now I have successfully installed Windows Server 2003 NLB clusters. I
used 2 nic per node and unicast mode.
For example
Node1 Node2
Pub Interface (default) Pub
Interface (default)
IP:192.168.1.11/24
IP:192.168.1.13/24
GW: 192.168.1.1
GW: 192.168.1.1
NLB Interface*
NLB Interface*
IP:192.168.1.12/24
IP: 192.168.1.14/24
GW:-
GW:-
NLB IP Address: 192.168.1.15
*DNS registration, File Share client and server, NetBIOS over TCP/IP
disabled on this interface.
After configuring IP addresses I would run NLB manager and configure cluster
in unicast mode.
When I tried this on Windows Server 2008, I could not access NLB address
outside local subnet. Only when I configure DEFAULT GATEWAY on both NIC's,
NLB started working.
When I run network monitor I notices that in this configuration, Windows
2003 would always respond using Public LAN (source MAC address would be from
public NIC), no matter if i tried to connect to Public or NLB IP address.
In Windows 2008 if I tried to connect to Public IP, response packet would
had source MAC address from Public NIC and when I accessed NLB address then
source MAC would be from NLB NIC. For me this looks like change from 2003.
So how do we correctly configure unicast NLB cluster with 2 NIC's in Windows
Server 2008? Do we just add default gateway to NLB NIC?
Krunoslav
P.S.
When I tried to search for solution I found that other people had this issue.
P.S.S.
I posted this exact question on
http://social.technet.microsoft.com/...-87e24451f875/ and one of answers is
>We had a Similar issue with a 2008 cluster, which turned out to be a problem >with both Unicast and Multicast IGMP. We contacted premier support and worked >with them for quite a bit, to discover (or bet told that) this is a "feature" in 2008. >By default, IP forwarding is disabled. A cluster with multiple NICs will not respond >without a default gateway enabled. This can be worked around by entering the >following command from a command prompt:
>replace the section in quotes with the name of the cluster NIC.
>--netsh interface ipv4 set int "Front-end" forwarding=enabled
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