I am new in firewall configuration.  It seems that when I read articles on
the web, people suggest that, one should setup the firewalling rules to deny
everything and allow specifics?

What is wrong with having a rules accept all but deny specifics.

Could I not just block ports that I am using, like telnet 23 , ftp 21 , ssh
22, NetBIOS 135-139 and such.  Why should I block everything coming in?

Thanks!


-Sebastian


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