Date: Thu, 31 May 2001 15:15:26 -0400 (EDT) From: Rob Simmons <rsimmons@wlcg.com> To: Mike Silbersack <silby@silby.com> Cc: freebsd-security@FreeBSD.ORG Subject: Re: Limiting TCP RST Response Packets Message-ID: <Pine.BSF.4.21.0105311514090.4425-100000@mail.wlcg.com> In-Reply-To: <20010531135800.F73746-100000@achilles.silby.com>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: RIPEMD160 Maybe that should be mentioned in LINT? Robert Simmons Systems Administrator http://www.wlcg.com/ On Thu, 31 May 2001, Mike Silbersack wrote: > > On Thu, 31 May 2001, Rob Simmons wrote: > > > -----BEGIN PGP SIGNED MESSAGE----- > > Hash: RIPEMD160 > > > > You will need to add the following line to your kernel config file, and > > recompile the kernel: > > > > options TCP_RESTRICT_RST > > > > You should also read the comments about this option in the LINT file. > > No. Bad. This is a paranoid response that will reduce the general > friendlyness of your box, and doesn't help much (if it all) more than > simply letting the built-in ratelimiting function. > > However, if you wish to reduce the rst packets per second, tune the > net.inet.icmp.icmplim sysctl. Don't reduce the count to zero, that means > unlimited. I find 20 to be a nice limit, personally. > > Mike "Silby" Silbersack > > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.5 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE7FphSv8Bofna59hYRAyTvAJ979VdkOCleyOBmXGN1avmhm+B3igCfZsXb GgT+DR70aWE6BPs5XufqAcM= =u7r3 -----END PGP SIGNATURE----- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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