[nSLUG] Recording audio from a Vonage Box

Stephen Gregory nslug at kernelpanic.ca
Tue Jun 24 12:56:01 ADT 2008

On Tue, Jun 24, 2008 at 09:15:47AM -0400, Gerald wrote:
> iptables -t filter -A INPUT -d external-ip -i eth0 -p udp -m udp --dport 
> 1024:65535 -m state --state RELATED,ESTABLISHED -j ACCEPT
> iptables -t filter -A INPUT -d external-ip -i eth0 -p tcp -m tcp --dport 
> 1024:65535 -m state --state RELATED,ESTABLISHED -j ACCEPT

According to the vonage docs you do no need to forward any
ports. These two rules basically make your firewall useless and don't
do what you expect. The INPUT chain only applies to the firewall
itself. If you wanted packets passed through your firewall you would
use the FORWARD chain along with rules in the PREROUTE chain in the
nat table.

I strongly recommend that you remove these rules.


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