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Using a Sniffer to Diagnose Firewall Problems

Many problems can be isolated by running a packet sniffer on your firewall. Our favorite is tetheral, a part of the ethereal package, because it will put the packets into a more readable form than tcpdump, which is another good option. tetheral is also handy for command line diagnosis work because it works without all the fuss of a GUI and all the "voodoo" of a more lower-level sniffer such as tcpdump.more...

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