telnet kai security question...

[pestilence]

Klayterh lysh einai na xrhsimpoiseis firewall
an exeis 2.1.x h 2.2.x kernel kai exeis support gia firewall ston pyrhna kane:
ipchains -A input -p tcp -s thn.ip.pu.8eleis.na.eptrepeis -d thn.dikia.sou.ip
telnet -j ACCEPT
kane to idio gia ola ta hosts pou 8eleis na exoun prosbasei.
Kai telos kopse ola ta ypoloipa me:
ipchains -A input -p tcp -s 0/0 -d thn.dikia.sou.ip telnet -j DENY 
Ayto 8a kopsei thn prosbash se ola ta ypoloipa mhxanhmata.
Prosexe na baleis prwta ta hosts pou 8eleis na exoun prosbasei sto systhma sou,
idalliws an baleis prwta ta DENY, den 8a mporei na mpei kaneis, ka8ws to
ipchains koita me thn seira ta rules pou tou exeis orhsh.
Gia perissoteres plhrofories rixe mia matia:
http://howto.linuxberg.com/LDP/HOWTO/IPCHAINS-HOWTO.html
an den exeis ipchains tote:
http://howto.linuxberg.com/LDP/HOWTO/Firewall-HOWTO.html
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