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I have a 12mbps connection, so I know that my ichat transfers should be super fast. When I receive files from some people, my transfer rate is about 1k/sec, which is horrible. Why would this be happening? Do I need to do something with my router?

In the Connection Doctor it says Router Type: Port Restricted.

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You'll probably need to modify your router's NAT settings. What brand/model of router do you have? – Austin May 9 '11 at 18:56
I have a ZyXEL Q1000Z. – Nic Hubbard May 9 '11 at 20:39

You'll want to use these two documents to forward the appropriate ports on your router:

If you have specific questions about port forwarding on your router, you could try asking over at Super User.

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