blocking all trafic exapt selcter ports

Kashif Ali Bukhari kbukhari at
Sat Apr 23 10:47:26 CEST 2005

i want to block all inbod access to my linux box and want to allow
dns, http proxy,ssh,telnet,and ftp 
how can i do this 

Syed Kashif Ali Bukhari
Network Associate Asia Net
Cell :- +92-300-4018407 , +92-300-4295604
Ph +92-42-111-111-202 Fax +92-42-5840905
MSN:- kbukhari at ; kashif.bukhari at ,

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