default iptables rules
kassube at gmx.net
Sun Sep 16 21:45:02 UTC 2007
Jimmy Wu wrote:
> Also, I've heard of port stealthing on certain
> firewall software -- does anyone know what that is?
Usually a client trying to connect to a closed port gets an answer from
the machine "service not available", i.e. the port is closed. For a
stealthed port there is no answer. It is debatable if that is useful,
though. Some proponents of stealth ports think, an attacker can not find
out if there is a machine listening on that IP address. However, if there
is no machine, a router on the way to that IP should respond with an
answer "machine not available". If there is no answer, there is a machine
available at that IP address. But maybe there are other reasons, why
stealth ports might be useful.
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