Linux's iptables allows powerful firewalls to be implemented at a minute fraction of the cost of many commercial offerings. Basic iptables firewalls are packet filters, which means they inspect the ...
In my last column, I sang the praises of application-layer proxy firewalls and introduced Balazs Scheidler's Zorp firewall suite, available in both commercial and free-of-charge versions. This column ...
Say, I'm just tooling around with iptables on an RH8.0 box. I was trying to add a filter for all telnet connections to be rejected except from one particular machine on my LAN. The command I'm using ...