Linux Pacbell DSL Setup

Last Modified: June 20, 2002

If you have problems, check the FAQ

Okay, so you have 2 (or more) computers and your too cheap to pay for "PREMIUM" access. Well guess what, they stick you with something called PPPoE (PPP over ETHERNET) it makes setup a LITTLE more work, but it won't stop us! Here is what you will need:

A linux box with 1 network card (redhat 6.0 or greater is best)
A 10MB hub ($20-$25)
A copy of PPPoE from www.roaringpenguin.com, ROAR!

First you need to make sure you have the following options compiled into your kernel:
(run make menuconfig in /usr/src/linux)

In the NETWORKING OPTIONS section

Network Firewalls
IP firewalling
IP always defragment (this option was removed in newer kernels)
IP masquerading
ICMP masquerading
aliasing support (this allows you to do the eth0:1 interface)

In the Network Device section

PPP (point-to-point) support

Install the PPPoE Package from Roaring Penguin, just run the /usr/sbin/adsl-setup program (its kick ass automagic!)

Okay create a /etc/rc.d/rc.local file that looks like this:

# Enable IP forwarding /bin/echo 1 >/proc/sys/net/ipv4/ip_forward # Insert protocol specific modules /sbin/insmod /lib/modules/2.2.XX/ipv4/ip_masq_cuseeme.o /sbin/insmod /lib/modules/2.2.XX/ipv4/ip_masq_ftp.o /sbin/insmod /lib/modules/2.2.XX/ipv4/ip_masq_irc.o /sbin/insmod /lib/modules/2.2.XX/ipv4/ip_masq_quake.o /sbin/insmod /lib/modules/2.2.XX/ipv4/ip_masq_raudio.o /sbin/insmod /lib/modules/2.2.XX/ipv4/ip_masq_user.o /sbin/insmod /lib/modules/2.2.XX/ipv4/ip_masq_vdolive.o # Default forward policy = DENY /sbin/ipchains -P forward DENY # Setup masqurading /sbin/ipchains -A forward -i ppp0 -j MASQ #(interface is where to masq TO) # Keeps sessions from timing out too quickly /sbin/ipchains -M -S 604800 30 30 # Bringup internal interface (PPPoE gets mad if eth0:1 is broughtup first) # Thus you can't put this in /etc/sysconfig/network-scripts/ifcfg-eth0:1 :( /sbin/ifconfig eth0:1 192.168.0.1 up /sbin/route add -net 192.168.0.0 netmask 255.255.255.0 eth0:1

Next plug EVERYTHING into your hub

Now setup your client machines with a 192.168.0.XXX address
and a gateway of 192.168.0.1 and your done.