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Configure iptables firewall to allow DHCP, DNS, HTTP, SMTP, FTP, IMAP, POP, and Squid ports – deny all other services.

1 pc for router ( place firewall) 1 pc for server ( place web,dhcp,ftp,etc)

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You can use system-config-firewall if you have GUI installed on RHEL, Cent OS or Fedora systems. Then just put ticks and apply.

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