Dear Markus,
your suggestions had a good sound. I'm not able to make the tries directly on the HD installation on the
PC of my office (I'll not be there till monday or tuesday).
Thus, I tried by running the 4.0.2 Cd version of Knoppix from the CD of my laptop.
(BTW, tell me if this make a big difference in test, but I think that trying to connect by ssh
to a Knoppix running machine in the "live" way is a problem interesting in itself).

This is the result of my tries.

root@0[knoppix]# netcardconfig
Sending DHCP broadcast from device eth0 OK.

root@0[knoppix]# netstat -tupan
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:68 0.0.0.0:* LISTEN 1984/pump
tcp 0 0 0.0.0.0:6000 0.0.0.0:* LISTEN 2607/XFree86

root@0[knoppix]# iptables -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination

root@0[knoppix]# /sbin/iptables -A INPUT -i eth0 -p tcp -m tcp --dport 22 -j ACCEPT

root@0[knoppix]# /sbin/iptables -A INPUT -i eth0 -p udp -m udp --dport 22 -j ACCEPT


Then, I connected by ssh to another machine (say pippo its name) where I've an account:
as usual, no problem.
From that machine (pippo), I've written the command

pippo-ugo:ssh -l knoppix XXX.YYY.WWW.ZZ
ssh: connect to host XXX.YYY.WWW.ZZ port 22: Connection refused

where obviously XXX.YYY.WWW.ZZ means the IP number given to my laptop by the DHCP server.

Thus, it seems to not work.
I've read a little the man page about iptables, but this overwhelm my little knowledge of Linux.
Any other idea to go on?


Thanks a lot for your effort,
ciao,
Ugo