I've never used talk outside a lan so I cannot comment on how to do it. But let me point out that you can also chat with netcat or cryptcat. First install it:
Code:
sudo apt-get install cryptcat
In the first machine use
Code:
cryptcat -nvlp <port_number> -k <password>
and the in the second use
Code:
cryptcat -nv <ip_number> <port_number> -k <password>
Works similarly to netcat. I think cryptcat is better for net chatting as it sends everything encrypted. While chatting I prefer that one sides starts his lines with the plus sign so they are easier to see.
Note that there is also socat which can use openssl:
http://www.dest-unreach.org/socat/
http://www.dest-unreach.org/socat/do...ssltunnel.html
http://www.dest-unreach.org/socat/doc/socat.html
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