Linux-kernel mailing list archive 1998-49,: Re: Logging unserved ports

# Re: Logging unserved ports

Andi Kleen (ak@muc.de)
Wed, 9 Dec 1998 07:02:31 +0100

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In muc.lists.linux-kernel, you wrote:
>Hi,
> The TIS gauntlet firewall modifies the BSDi kernel
>so that when packets are received on unserved ports the
>kernel logs a security alert via syslog. That way you
>don't have to be actively scanning the network for port
>scans and can just scan your syslog instead. I looked
>through the Linux security HOWTO and couldn't find any
>mention of this. Is this possible with the Linux kernel?

Sure. Just add a logging firewall rule for the unused port range(s)
But be careful, the standard firewall does no load limiting for
firewall logs, so an attacker might easily fill up your logging
disk.

-Andi

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