enabling UDP ports for netmeeting

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I am trying to enable UDP ports so that netmeeting will allow packets to pass throught my firewalling. I have downloaded and applied ipchains 1.3.8-1. I got the following commands that another server uses to allow netwmeeting to run fine:
 
echo "Starting IPCHAINS for UDP"
/sbin/ipchains -P forward DENY
/sbin/ipchains -A forward -j MASQ -s 10.0.0.0/24 -d 0.0.0.0/0
 
However when I run the first ipchains command I get the following message:
 
[root@bella1 /root]# /sbin/ipchains -P forward DENY
ipchains: Protocol not available
 
I no networking guru and would appreciate some assistance. Thanks in advance.

Pat Grogan
 

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