Internet sharing with ipchains

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I got a question. I have configured a server to serve as a firewall and
provide MASQ connection to the internet. Now after I have set my default
input policy to DENY nobody can connect the internet via any service
(www,ftp, etc...). But after I allowed input for port 1023:65535 everything
seems to work fine. Is there something that I have missed as allowing
1023:65535 is making a big hole in the firewall. My intention for the DENY
as the default input policy is to allow what I permit and DENY everything by
default.

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