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Date:      10 May 2001 11:09:06 +0200
From:      Dag-Erling Smorgrav <des@ofug.org>
To:        "Retal" <lirandb@netvision.net.il>
Cc:        <freebsd-security@FreeBSD.ORG>
Subject:   Re: Some Kernel options
Message-ID:  <xzp7kzplgel.fsf@flood.ping.uio.no>
In-Reply-To: <002601ba1df7$4da07940$b88f39d5@a>
References:  <002601ba1df7$4da07940$b88f39d5@a>

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"Retal" <lirandb@netvision.net.il> writes:
> options         KBD_INSTALL_CDEV        # install a CDEV entry in /dev

This option has no (visible) effect unless you use a USB keyboard.

> options         TCP_DROP_SYNFIN         #drop TCP packets with SYN+FIN

This option has no effect unless you set tcp_drop_synfin="YES" in
/etc/rc.conf.

> options         TCP_RESTRICT_RST        #restrict emission of TCP RST

Don't.  Use blackhole(4) instead.

> options         ICMP_BANDLIM

This option has an easily demonstrable effect: try running 'nmap -sS'
against your machine.

> BTW: if i add TCP_DROP_SYNFIN, it should effect setup option in my
> firewall ?if it is, how ?

See the rc.conf(5) man page.

DES
-- 
Dag-Erling Smorgrav - des@ofug.org

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