I'm trying to get my STN box more secure by adding some commands to the 
startup. One of them should be correct to block ping (ICMP) requests. 
The command goes as follows:

ipfwadm -I -a deny -P icmp -W $ANYDEV -D $OURBCAST

STN starts without err msg's, but the external NIC is still pingable.
I'm not that familiar with ipfwadm commands, but one thing that seems 
wrong is then $OURCAST variable, which could mean the internal network. 
Since I'm using a private network range (10.0.0.x), this wouldn't be 
visible anyway. Pinging internal hosts works just fine. Pinging the STN 
box external NIC from inside works fine too.
Can somebody tell me how to make the external NIC not pingable (less 
visibility from the internet)?

Thanks,
Sean

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