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#!/bin/sh
#
# rc.firewall - Initial SIMPLE IP Masquerade test for 2.1.x and 2.2.x
#               kernels using IPCHAINS
#
# Load all required IP MASQ modules
#
#   NOTE:  Only load the IP MASQ modules you need.  All current IP MASQ modules
#          are shown below but are commented out from loading.

# Needed to initially load modules
#
/sbin/depmod -a

# Supports the proper masquerading of FTP file transfers using the PORT method
#
/sbin/modprobe ip_masq_ftp

# Supports the masquerading of RealAudio over UDP.  Without this module,
#       RealAudio WILL function but in TCP mode.  This can cause a reduction
#       in sound quality
#
/sbin/modprobe ip_masq_raudio

# Supports the masquerading of IRC DCC file transfers
#
/sbin/modprobe ip_masq_irc


# Supports the masquerading of Quake and QuakeWorld by default.  This 
#   modules is for for multiple users behind the Linux MASQ server.  
#   If you are going to play Quake I, II, and III, use the second example.
#
#Quake I / QuakeWorld (ports 26000 and 27000)
#/sbin/modprobe ip_masq_quake
#
#Quake I/II/III / QuakeWorld (ports 26000, 27000, 27910, 27960)
#/sbin/modprobe ip_masq_quake ports=26000,27000,27910,27960


# Supports the masquerading of the CuSeeme video conferencing software
#
#/sbin/modprobe ip_masq_cuseeme

#Supports the masquerading of the VDO-live video conferencing software
#
#/sbin/modprobe ip_masq_vdolive


#CRITICAL:  Enable IP forwarding since it is disabled by default
#
#           Redhat Users:  you may try changing the options
#           in /etc/sysconfig/network from:
#
#                       FORWARD_IPV4=false
#                             to
#                       FORWARD_IPV4=true
#
echo "1" > /proc/sys/net/ipv4/ip_forward


# Dynamic IP users:
#
#   If you get your IP address dynamically from SLIP, PPP, or DHCP, 
#       enable this following option.  This enables dynamic-ip address 
#       hacking in IP MASQ, making the life with Diald and similar 
#       programs much easier.
#
#echo "1" > /proc/sys/net/ipv4/ip_dynaddr


# MASQ timeouts
#
#   2 hrs timeout for TCP session timeouts
#  10 sec timeout for traffic after the TCP/IP "FIN" packet is received
#  160 sec timeout for UDP traffic (Important for MASQ'ed ICQ users) 
#
/sbin/ipchains -M -S 7200 10 160


# DHCP:  For people who receive their external IP address 
#        from either DHCP or BOOTP such as ADSL or Cablemodem 
#        users, it is necessary to use the following before the 
#        deny command.  The "bootp_client_net_if_name" should be 
#        replaced by the name of the link that the DHCP/BOOTP 
#        server will put an address onto. This will be something 
#        like "eth0", "eth1", etc.
#
#        This example is currently commented out.
#
#
#/sbin/ipchains -A input -j ACCEPT -i bootp_clients_net_if_name -s 0/0 67 -d 0/0 68 -p udp

# Enable simple IP forwarding and Masquerading
#
#  NOTE:  The following is an example for an internal LAN address 
#         in the 192.168.0.x network with a 255.255.255.0 or a "24"
#         bit subnet mask.
#
#         Please change this network number and subnet mask to match your 
#         internal LAN setup
#
/sbin/ipchains -P forward DENY
/sbin/ipchains -A forward -s 192.168.0.0/16 -j MASQ