Firewall/NAT

m0n0wall with MS Network Load Balancing.

Has anyone tried using monowall as firewall for a network that has few servers tied under Microsoft's Network Load Balancing.
Basically the public IP is shared between a number of machines and taken cared off by the Cluster Master.

My setup is using public IP where the m0n0wall's ip is also in the range.

I have problems where the firewall seems to be blocking some local traffic under OPT1 interface.
 
I believe firewall shouldn't disturb traffic at the switch level where its connected to.

I've setup only to filter incoming traffic. For outgoing. its free flow.



[ A ]

[ B ]     [Switch] ------------ [m0n0wall] -------- [ISP]

[ C ]

[ D ]


Eg.

Assume machine B,C,D tied up using NLB where B is the master. Each has its own public ip and each box assigned with a common public IP (taken cared off by NLB master).

Faced one issue where the monobox seemed to block sql access from say machine [D] to the sql server [C]. Its recorded in the log. I even tried to add the rule accordingly
but the behaviour is still the same.

Anybody encountered this before ?

if you need my status.php output, please reply back.

Version tried.
- Beta version 1.3b3
- version 1.231