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smb browsing broken by firewall

If you run system-config-securitylevel and enable the firewall, the
default iptables rules utilize conntrack for a stateful firewall. 
This is a good thing.

The rules, however, are insufficient to allow network browsing to work
in SMB applications such as nautilus smb:/// (Network Servers).  I
have traced this down to the fact that iptables/netfilter conntrack
code does not support tracking protocols which use broadcast/multicast
packets.  This will affect all broadcast/multicast-based network

My question is, how should we fix this?  This thread mentions the
possibility of implementing the broadcast/multicast support in the
conntrack kernel module, or using the -m recent module to poke holes
in the firewall:


What are people's thoughts on how to solve this problem?

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