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Old 05-31-2001
Lightbulb Support Needed: Education On Hold

I'm Presently Writting A College Report On Operating Systems, Not Enjoying It Very Much.

I Was Hoping Someone Could Direct Me To A Site Where I Could Get Information Such As The Role Of Operating Systems, Types Of Operating Systems (Multi-User Multi-Tasking etc), Modes Of Operating systems (Different Hierarchy's etc), Features Of Operating systems (Instruction Sets etc), Functions Of Operating systems (Memory Management etc).

If Anyone Knows Of Any Good Informative Sites Please Let Me Know.

Thanks,

Andy.
 
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synos(1)							Mail Avenger 0.8.3							  synos(1)

NAME
synos - guess operating system from TCP SYN fingerprint SYNOPSIS
synos [--mtu mtu] [--db path] syn-fingerprint DESCRIPTION
synos takes a SYN fingerprint, in the format described for the CLIENT_SYNFP environment variable in the avenger(1) man page, and outputs a guess as to the type of the client operating system. synos makes use of the OpenBSD SYN fingerprint database (which is also repackaged with Mail Avenger). OPTIONS --mtu val Certain operating systems set the initial TCP window size based on the maximum transmission unit, or MTU, of the network. For such operating systems, synos usually checks the window size using both the client's MSS option plus 40 bytes (for TCP and IP headers), or a hard-coded MTU, which defaults to 1,500 bytes. If either value works, the fingerprint is considered to match the operating system. You can change the value 1,500 by specifying this option. A value of 0 tells synos to use only the value derived from the MSS option. --db file Specifies an alternate location for the SYN fingerprint database. FILES
/usr/local/share/pf.os Default location of SYN fingerprint database. SEE ALSO
avenger(1), asmtpd(8) The Mail Avenger home page: <http://www.mailavenger.org/>. The OpenBSD home page: <http://www.openbsd.org/>. BUGS
The operating system type is determined by heuristics that are not always reliable. Moreover, not all operating systems can be distinguished. The database may not even contain a client's particular operating system and version. It is not hard to fool synos deliberately by changing TCP socket options or injecting raw packets onto the network. AUTHOR
David Mazieres Mail Avenger 0.8.3 2012-04-05 synos(1)