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 geo...@is.co.za; ge...@rucus.ru.ac.za; c...@freebsd.org tel: +27-83-292-5800 To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
