iptables

I'm trying to bring up my firewall on my server on only one of my two
interfaces. ltspbr0 is attached to eth1 and eth0 is the external
connection. In /etc/sysconfig/iptables, I added:
-A INPUT -i ltspbr0 -s 172.31.100.0/24 -j ACCEPT
where the bridge and subsequent network is 172.31.100/24.

There should be no other connections to the outside world on that side of
the server. Is this a gaping security hole, ie, can my users connecting to
the outside world cause a backdoor to the bridge side of the server?

Thanks!

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