Linux RoadRunner Setup

Last Modified: June 20, 2002

Okay, so you have 2 (or more) computers and your too cheap to pay for extra road runner accounts. 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)

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)

Okay create a /etc/rc.d/rc.local file that looks like this: 
    # Force Ip forwarding to activate
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 eth0 -j MASQ

# Keeps sessions from timing out too quickly 
/sbin/ipchains -M -S 604800 30 30

# Set permenant ip address of the machine
/sbin/ifconfig eth0:1 192.168.0.1

# Start DHCP server to obtain ip address from roadrunner
/sbin/dhcpcd eth0
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.