> 
> Is it possible to secure the ports on my Debian
> machine so that other machines on the internet
> cannot get through?
> 
> Is there some way to configure pppd to block packets?

ipchains. Read the IPCHAINS-HOWTO. Or just disable all the services
through /etc/inetd.conf (not advised for a couple of ports).
Andrew


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 Andrei S. Ivanov                  
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