Date: Mon, 23 Aug 1999 11:09:06 +0200 (SAST) From: "Geoff Rehmet" <geoffr@is.co.za> To: yurtesen@ispro.net.tr (Evren Yurtesen) Cc: hackers@freebsd.org Subject: Re: setting up -STABLE for hack contest Message-ID: <19990823090906.94848.qmail@rucus.ru.ac.za> In-Reply-To: <37BDA6E7.1B8F3BFB@ispro.net.tr> from Evren Yurtesen at "Aug 20, 1999 10:05:11 pm"
next in thread | previous in thread | raw e-mail | index | archive | help
Evren Yurtesen writes : > it is possible to detect operating systems from their behaviours > of replying to packets. > > see the program queso from ports/packages. > > but anyway you can change the login prompt from /etc/gettytab file > Also have a look at ports/security/nmap, and go to www.insecure.org. In order to stop someone guessing your OS, you will need to make changes to your TCP implementation. These include, changing the way in which TCP initial sequence numbers are calculated, as well as changing behaviour of TCP wrt the handling of certain "unexpected" TCP segments on open or closed ports - e.g. what happens when someone sends a surprise FIN segment to a closed port. Geoff. -- Geoff Rehmet, The Internet Solution geoffr@is.co.za; geoff@rucus.ru.ac.za; csgr@freebsd.org tel: +27-83-292-5800 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19990823090906.94848.qmail>