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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 HPUX
inet
inet(7F) inet(7F) NAME
inet - Internet protocol family SYNOPSIS
DESCRIPTION
The internet protocol family is a collection of protocols layered on top of the (IP) network layer, which utilizes the internet address format. The internet family supports the SOCK_STREAM and SOCK_DGRAM socket types. Addressing Internet addresses are four byte entities. The include file defines this address as the structure Sockets bound to the internet protocol family utilize an addressing structure called Pointers to this structure can be used in system calls wherever they ask for a pointer to a There are three fields of interest within this structure. The first is which must be set to AF_INET. The next is which specifies the port number to be used on the desired host. The third is which is of type and specifies the address of the desired host. Protocols The internet protocol family is comprised of the IP network protocol, Internet Control Message Protocol (ICMP), Transmission Control Proto- col (TCP), and User Datagram Protocol (UDP). TCP is used to support the socket type while UDP is used to support the socket type. The ICMP message protocol and IP network protocol are not directly accessible. The local port address is selected from independent domains for TCP and UDP sockets. This means that creating a TCP socket and binding it to local port number 10000, for example, does not interfere with creating a UDP socket and also binding it to local port number 10000 at the same time. Port numbers in the range 1-1023 inclusive are reserved for use by the super-user only. Attempts to bind to port numbers in this range by non-super-users fail and result in an error returned. AUTHOR
was developed by the University of California, Berkeley. SEE ALSO
tcp(7P), udp(7P). inet(7F)