Date: Fri, 12 Oct 2001 10:37:57 -0500 (CDT) From: Mike Silbersack <silby@silby.com> To: Radoy Pavlov <pavlov@euroscript-ls.de> Cc: <freebsd-security@freebsd.org> Subject: Re: Randomizing TCP sequence Message-ID: <20011012103330.F29732-100000@achilles.silby.com> In-Reply-To: <3BC6D445.27C078CF@euroscript-ls.de>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, 12 Oct 2001, Radoy Pavlov wrote: > I'm trying to randomize my tcp sequence. Upon > experimenting with portsentry i made couple of > nmap scans and I was suprized to see that the > value never exceeds the number of 30, which IMO > is weak. I activated net.inet.tcp.strict_rfc1948=1, > which should do the randomizing, still i get a > value of 30 or so. Scan your box from another box; there's something funky with nmaping localhost. When I try it, nmap says that there aren't enough responses for a good identification. Alternately, run tcpdump and watch the sequence numbers; the output is quite pseudo-random. Mike "Silby" Silbersack To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20011012103330.F29732-100000>