Configuring FreeBSD as a PPP Dialup Router
This document is based on the author's personal experience setting up FreeBSD as a PPP dialup router using FreeBSD's kernel-mode PPP (/usr/sbin/pppd), and assumes the reader's familiarity with UNIX administration basics. Essentially this document is a walk-through of configuring a FreeBSD system with two modems to be a TCP/IP dialup router.
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Configuring NATd
These instructions will help you configure NATd on FreeBSD 2.2.2-RELEASE to 3.0-SNAP with the firewall implemented.
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IP Aliasing
IP aliasing is the process of adding more than one IP address to a network interface. Typical uses of IP aliasing are virtual hosting of Web and FTP servers and reorganizing servers without having to update any other machines (this last one is especially useful for nameservers). Think of an IP alias as a little kid piggy-backed on their parent interface (which is has the primary address of the physical interface).
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Setting up a DHCP client on older FreeBSD versions
Currently there is no streamlined way of setting up a DHCP client for FreeBSD. I have cobbled together the following procedure out of a lot of trial and error and I would like to save you the same aggravation.
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Setting up a DHCP server on FreeBSD
Setting up a DHCP server for FreeBSD is pretty straightforward, though not as simple as installing a port.
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Setting up the IPFW Firewall
These instructions will help you configure FreeBSD 2.2.2-RELEASE to 3.0-SNAP to act as a firewall.
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