Dear friend: ( I am not on the list)

I've got a LAN with one linux + few win9x clients, the linux  redhat
6.0, kernel 2.2.12 has one isdn to connect online frequently.  Use
IP-masqurade, squid, sock to get online.( i rarely thinking about the
security)Nowadays, my friends on win9x are complaining about the
firewall.  They find a website www.dialpad.com which enable u to connect
analog telephone via Web browser<it's a java applet>  but remote could
hear us, but we can't hear the remote voice. That because of we use
ip-masq, so the udp stream didn't come to the correct win9x client
through the linux. 
I've read help from www.dialpad.com. it want me to 

use ipchains to allow masq upd ports 51200-51201 and tcp ports 7175
,51210
/usr/sbin/ipmasqadm autofw -A -v -r upd 51200 51201 -c tcp 7175
/usr/sbin/ipmasqadm autofw -A -v -r tcp 51210 51210 -c tcp 7175 

but i don't know how to enable it... my ipchains settings in
/etc/rc.d/rc.local
//////////////ipchains -P forward DENY
//////////////ipchains -A forward -s 10.0.0.0/24 -j MASQ     
#my pc are 10.0.0.x, and my linux is 10.0.0.1
when i run ipmasqadm autofw xxxx,, it said 
/////////Adding autofwd tcp ports 51210 - 51210 via tcp ctl port 7175 US
/////////autofw: setsockopt failed: Invalid argument

Please help me
Yours Simon
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