DCC through a firewall

Vernon Schryver vjs@calcite.rhyolite.com
Tue Jul 16 21:33:12 UTC 2002

> From: "Luke Galea" <lgalea@bluecatnetworks.com>

> 	I am having difficulties getting my firewall to allow DCC.
> What ports must I open?? I found port 6277 but I must be missing
> something.. I tried allowing from 6277 to user ports.. and from user
> ports to 6277... both UDP and TCP.. and I tried from 6277 on my box
> externally.. I must have just gotten confused somewhere along the way..

As the FAQ tries to say in
DCC clients send to the server's UDP port 6277 from an anonymous port,
and of course, receive from the distant server's port 6277.

DCC inter-server flooding uses a pair of TCP connections, one originated
by each peer.  Each of the two TCP connections uses a anonymous client
port number or a port number specified in the /var/dcc/flod file.  The
server port number is also 6277.

Vernon Schryver    vjs@rhyolite.com

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