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Q: iChat AV and Firewalls - Mac Networking

In article <c8magvo4onlhnm7khbakfche105v72v77o4ax.com>, Martin Raab <6qz877r001sneakemail.com> wrote: > Hello comp.sys.mac.comm, > we trying to set up the communication between some iChat AV Users with > iSight Cameras and 2 seperate offices. > > Both offices do have a static IP with diffrent types of firewalls ( > Watchguard, Cisco PiX). > > Inside LAN IPs are RFC1918 - like 192.168.x.x ... > > Even if we allow from INSIDE everything to OUTSIDE, the connection > wont work. > > Any ideas ? > > Thanks in advance. From Apple's Knowledge Base: -- start -- Frequently used by corporations and educational ...

  1. #1

    Default Re: Q: iChat AV and Firewalls

    In article <c8magvo4onlhnm7khbakfche105v72v77o4ax.com>,
    Martin Raab <6qz877r001sneakemail.com> wrote:
    > Hello comp.sys.mac.comm,
    > we trying to set up the communication between some iChat AV Users with
    > iSight Cameras and 2 seperate offices.
    >
    > Both offices do have a static IP with diffrent types of firewalls (
    > Watchguard, Cisco PiX).
    >
    > Inside LAN IPs are RFC1918 - like 192.168.x.x ...
    >
    > Even if we allow from INSIDE everything to OUTSIDE, the connection
    > wont work.
    >
    > Any ideas ?
    >
    > Thanks in advance.
    From Apple's Knowledge Base:

    -- start --
    Frequently used by corporations and educational institutions for
    increased security, firewalls work by blocking certain Internet traffic
    from entering or leaving a network. Network administrators typically
    open a minimal amount of network ports, allowing the traffic for
    approved applications to enter and leave the network while blocking
    other network traffic.

    UDP Ports
    UDP Port 5060 is used by iChat AV for signaling and initiation of chat
    invitations. To use iChat AV behind a firewall, make sure your network
    administrator has opened UDP port 5060.

    UDP Ports 16384 to 16403 are used to send and receive video and audio
    data. For any particular conference, 4 ports from that range of 20 are
    utilized.
    One port is used for each of the following:
    Video in
    Video out
    Audio in
    Audio out

    --end--

    iChat also uses uPnP, which is a newish standard to open static NAT
    ports to individual computers behind a NAT device. If the NAT device
    does not support uPnP, I would think you may also have to statically map
    the outside NAT ports to the inside IP address. Windows Messenger
    videoconferencing uses a similar system (although its performance is a
    lot worse than iChats).

    Note that you didn't have to do this before because text chat messages
    go through a central server, but video chat performance would probably
    be unacceptable if done in the same fashion.

    Hope this helps,
    Jose R. Perez

    Jose R. Perez Guest

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    Default Re: Q: iChat AV and Firewalls

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