CAT CDMA and Ubuntu Server with Squid and Frox

[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
Phone = #777
ISDN = 0
Modem = /dev/ttyUSB0
Baud = 9600
 
 
Username = evdo@catevdo.com
Password = cdmacat
 
 
Stupid Mode = 1
New PPPD = yes
 
 
[novatel]
Modem = /dev/ttyUSB0
Baud = 115200
SetVolume = 0
Dial Command = ATDT
Init1 = ATZ
Init3 = ATM0
FlowControl = CRTSCTS
 
 
[Dialer cdma]
Username = evdo@catevdo.com
Password = cdmacat
Phone = #777
Stupid Mode = 1
Init1 = ATZ
Inherits = novatel

ppp0 = the network adapter with internet (via wvdial - usb modem)
eth0 = the network adapter for LAN connection

sudo ifconfig eth0 192.168.0.1

# allows forwarded packets
sudo iptables -A FORWARD -i ppp0 -o eth0 -s 192.168.0.0/24 -m conntrack --ctstate NEW -j ACCEPT
 
# allow forwarding of established or related packets
sudo iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
 
# does the NAT
sudo iptables -A POSTROUTING -t nat -j MASQUERADE

sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"

net.ipv4.conf.default.forwarding = 1
net.ipv4.conf.all.forwarding = 1

# create acl rule
acl localnet src 192.168.0.0/24
 
# allow localnet pass
http_access allow localnet
 
# set port to 8080 and transparent for transparent proxy
http_port 8080 transparent
 
# change RAM cache size (normally use amount of RAM divide by 3 (RAM/3))
cache_mem 256 MB
 
# size of file to cache in RAM
maximum_object_size_in_memory 1024 KB
 
# disk cache directory (I used 10GB)
# I don't know how much size for suitable in my cafe'
cache_dir ufs /var/spool/squid 10240 16 256
 
# maximum size of file want to cache
maximum_object_size 30720 KB

#uncomment below line (change port to squid port if necessary)
HTTPProxy 127.0.0.1:8080
 
#uncomment below line
ForceHTTP yes
CacheModule HTTP
 
#comment below line (for disable local cache and use squid cache instead)
#CacheModule local
#CacheSize 4000

# redirect http port (80,88,9898) from eth0 to port 8080 (squid proxy port)
sudo iptables -A PREROUTING -m multiport -t nat -i eth0 -p tcp --dport 80,88,9898 -j REDIRECT --to-port 8080
 
# redirect ftp port (21,6001,8021) from eth0 to port 2121 (frox port)
sudo iptables -A PREROUTING -m multiport -t nat -i eth0 -p tcp --dport 21,6001,8021 -j REDIRECT --to-port 2121

# stop squid
sudo service squid stop
 
# recreate squid cache
sudo squid -z
 
# start squid
sudo service squid start
 
# stop frox
sudo service frox stop
 
#start frox
sudo service frox start

#save iptables's rules to home directory
sudo iptables-save > /home/[username]/iptables.rules
 
#copy its to /etc
sudo cp /home/[username]/iptables.rules /etc/iptables.rules

pre-up iptables-restore < /etc/iptables.rules

auto eth0
iface eth0 inet static
    address 192.168.0.1
    netmask 255.255.255.0
    network 192.168.0.0
    pre-up iptables-restore < /etc/iptables.rules

#!/bin/sh
echo "Stopping firewall and allowing everyone..."
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
echo "Done."