Problems after router change

I have just changed my wireless router and am having problems connecting with iChat video. I have tested it with Apple testers on my old router (802.11g/b) and it works perfectly but it will not connect with my new one (802.11n) although it does work OK from one of my computers to the other - perhaps a local network issue? The message I get is that I have been disconnected because no data has been received in the last 10 seconds. The routers are the same make (Netgear) and I have populated each of them with much the same data regarding Firewall rules etc. Any help would be appreciated. I could just go back to the old one but I'm hoping for better speeds and range from the new one so would like to get it working.

Hi,
The DG834G Netgear that I had would not work without the DOS being Off and the Pings being allowed.
Do you still have the Port Forwarding setting Enabled ?
I am curious about the VPN.
Some VPNs are set up with an Internet connection as part of the process.
It sounds like this one is not. iChat cannot resolve two connections to the Internet (Wifi and Ethernet at the same time for instance)
The No Data for 10 Secs message means you were connected (even if you did not see any Video or hear any Audio).
The message means that iChat did not end the chat and that an external event did, such as pulling an Ethernet cable, router failure, turning off the Mac's Airport card.
DOS work on a threshold basis and if it receives "Too much Data, Too Quickly" it cuts the port that this is happening on to "Protect" the whole connection.
This threshold cannot be changed and tends to be lower than iChat can Stream video over modern connection speeds.
I would try two things separately.
The SIP ALG is something I did not have on my Netgear.
iChat Uses SIP so I would try it with that ON.
Also try setting iChat menu > Preferences > Video Section > Bandwidth Limit to 500kbps
iChat 5 Can "See" your whole Internet Connection speed. (iChat 4 and Earlier was limited to a max of 1.5Mbps set in System Preferences > Quicktime > Streaming - a setting that does not exist in Snow Leopard)
It could be that the new router allows faster throughput and that you have moved to iChat 5 meaning you are bumping into the DOS threshold.
Of course the issue could be at the other end. The log is not that specific about which end "Cut" the connection.
7:34 PM Sunday; July 25, 2010
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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