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Build a Home-Office Router Using FreeBSD and …

2009-05-13 02:35:55来源：未知阅读 ()

Build a Home-Office Router Using FreeBSD and PF
Created: 03/21/2006
General Information
This guide will outline the basic steps for building a home-office router for use with a cable modem or DSL line using FreeBSD and Packet Filter (PF). It will cover updating FreeBSD, building a new kernel, and installing and configuring a DHCP server and DNS server to support a small internal network.
Requirements

Standard installation of FreeBSD 5.3 or greater

Two network cards

A text editor
Before beginning, we need to decide which network adapter is going to be connected to the internal network and which one is going to be connected to the external network (cable modem or DSL line).
Run 'ifconfig' from the command line to list the network adapters:
$ ifconfig
dc0: flags=108843 mtu 1500
      inet6 fe80::20c:29ff:fefc:800c%lnc0 prefixlen 64 scopeid 0x1
      inet 192.168.130.133 netmask 0xffffff00 broadcast 192.168.130.255
      ether 00:0c:29:fc:80:0c
xl0: flags=108802 mtu 1500
      ether 00:0c:29:fc:80:16
lo0: flags=8049 mtu 16384
      inet6 ::1 prefixlen 128
      inet6 fe80::1%lo0 prefixlen 64 scopeid 0x4
      inet 127.0.0.1 netmask 0xff000000
For this document I am going to use the following configuration:
dc0: external interface (IP address provided by ISP's DHCP server)
xl0: internal interface (IP address is static, 192.168.10.1)
Internal network: 192.168.10.0/255.255.255.0
Installation
Kernel source
First, we need to ensure that the kernel source is installed.  We will need the kernel source to recompile the kernel to add PF support.  The kernel source can be installed using 'sysinstall' utility.
From the sysinstall menu:

Select "Configure"

Select "Distributions"

Select "src"

Select "sys"
Update the system
Next we need to update
the system
(don't compile a kernel yet) and
the ports tree
.
Install network services
Once the system has been updated, we can install a few necessary services on our system; a DHCP server to provide IP addresses to clients on the internal network, and a DNS server to forward DNS requests from the internal clients to our ISP's DNS servers.
DHCP server:
#
#
cd /usr/ports/net/ics-dhcp3-server
make install clean (the default options are fine)
DNS server:
#
#
cd /usr/ports/dns/bind9

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