For realAudio and friends, check http://service.real.com/firewall/index.html.
In the general case, multi-channel protocols (those that use multiple
tcp/udp connections simltaneously) introduce problems in firewalling
environments. They must be explicitly supported. for example, if
addresses and ports are negociated or more generallly transmitted
as data in the packets, then thy must be NATed correctly, otherwise,
the auxiliary channels won't be correctly established.
an old example is ftp.
regards,
mouss
At 09:24 21/09/00 -0700, Ye, Xiaodong wrote:
>Thank you.
>
>Will a stateful inspection kind of firewall naturely block some protocols or
>will the NAT features (One real internet ip and a C Class internal IP) of
>firewall confuse the state table of connections?
>
>Regards,
>
>Yale
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