How do I configure my firewall to accept nmblookup data?

I'd like to have my firewall allow nmblookup data so that I can view the systems in my domain located in the Shared section of Finder. Currently I'm forced to disable the Firewall which doesn't protect my machine by default when it leaves our corporate HQ. My question is if there's an easy way to enable this one rule without hacking up conf files or a way to have the firewall determine based on what network it's connected to whether to enable itself or not.
Any help would be most appreciated. Thanks for taking the time to read this post.

You can use ipfw tool in command line and add only the network you want to protect, or enable the firewall in the preferences pane and add a new rule to check in some networks (ip address based) but allow the others.

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