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UNIX for Dummies Questions & Answers
OpenBSD as router?
Post 21628 by auswipe on Monday 20th of May 2002 04:10:42 PM
05-20-2002
I have a LinkSys router, but right now I am only using it to provide NAT functionality. Right now, all my traffic from the LinkSys is sent from the LinkSys to my OpenBSD box acting as firewall/proxy server.
I also run natd on the OpenBSD machine to route traffic to my FreeBSD mailserver behind the OpenBSD box.
I prefer the OpenBSD box as it gives me fine grain control of what I let in/out/monitor. I am using OpenBSD 2.9 with two 3Com905 NICs and it works just fine.
I still use ZoneAlarm on my Win32 machines so that I can control what apps try to contact the outside world. ZoneAlarm is great!
There are a large number of tutorials on how to setup an OpenBSD box as a router.
Here is one such article that is well written:
http://mlowe.phpwebhosting.com/pages...e=openbsd.html
It's a little overkill for a home situation, but it keeps me entertained for hours on end. My wife just doesn't understand why it is cool that we have a mail server in the house. She just looks at me and smiles.
I also run natd on the OpenBSD machine to route traffic to my FreeBSD mailserver behind the OpenBSD box.
I prefer the OpenBSD box as it gives me fine grain control of what I let in/out/monitor. I am using OpenBSD 2.9 with two 3Com905 NICs and it works just fine.
I still use ZoneAlarm on my Win32 machines so that I can control what apps try to contact the outside world. ZoneAlarm is great!
There are a large number of tutorials on how to setup an OpenBSD box as a router.
Here is one such article that is well written:
http://mlowe.phpwebhosting.com/pages...e=openbsd.html
It's a little overkill for a home situation, but it keeps me entertained for hours on end. My wife just doesn't understand why it is cool that we have a mail server in the house. She just looks at me and smiles.
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LEARN ABOUT DEBIAN
synos
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)