Iptables breaks a working VoIP phone?

Nicholas Leippe nick at leippe.com
Mon Oct 29 11:18:27 MDT 2007

On Monday 29 October 2007, Kenneth Burgener wrote:
> Dave Smith wrote:
> > Have you run Wireshark on the phone-side to see what the traffic looks
> > like in both scenarios (1, with the Linksys router, and 2, with the
> > Linux firewall?)
> My network is setup like this:
> Internet - Comcast Modem - Linux Firewall - Network Switch - Sipura SPA
> 2100 ATA - All analog phones in house
> The Switch should not be broadcasting all traffic to anything other than
> the source destination interface ports.  This would leave the Linux
> Firewall as the only place I can gather network data.  So I wouldn't be
> able to do any network monitoring with the Linksys router swapped out
> for the Network Switch.

Yes, but you could try this:

Internet - Comcast Modem - Linksys - Linux Firewall - Switch - ATA

And run the linux firewall in bridging mode to snoop all the traffic.

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