Linksys WRT-54GL 1.1, Traffic splitting between 2 ISPs, Traffic accounting

This was done for data least cost routing, in South Africa, due to much cheaper "Local" bandwidth.

NOTE: You will need to have the following SD mod installed on your router:
http://www.hendlsofen.de/WRT54GL/eng/WRT54GL_SDMod.html

Firmware used, eko branch:
http://www.dd-wrt.com/dd-wrtv2/downloads/others/eko/V24_TNG/svn13491-snow/NEWD/dd-wrt.v24-13491_NEWD_std.bin

MMC/SD Card Support must be enabled on the router’s web interface:
GPIO pins select – Manual
GPIO pins DI:2  D0:4  CLK:3  CS:7

Install BWLOG:
SSH to your router

cd /mmc/jffs/scripts
wget http://www.krikkit.net/download/wrtbwlog_cust_exp.tgz

tar -zxvf wrtbwlog_cust_exp.tgz

Page will be accessible by going to http://your_router_ip:8000

On the router’s web interface,
Administration --> Commands --> Startup
Startup script:

#!/bin/sh
PATH=/usr/sbin:/sbin:/usr/bin:$PATH

umount /jffs
mount --bind /mmc/jffs /jffs

killall redial
killall pppd

#INTERNATIONAL
INTLUSER=isp1_username
INTLPASS=isp1_password
#LOCAL
LOCALUSER=isp2_username
LOCALPASS=isp2_password
#OTHER SETTINGS
INTRFACE=nic-vlan1
SAIXSMTP=196.43.2.142
ROUTESERVER=196.38.40.110
INTL=ppp0
LOCL=ppp1
TIMEOUT=120

setintlroutes () {
echo ...setting International routes
route add -host $ROUTESERVER $INTL
route add -host $SAIXSMTP $INTL
}

setdefaultroute () {
echo ...applying default route
route del default
route del default
route del default
route add default $INTL
}

getloclroutes () {
echo Downloading Local routes...
sleep 5
wget -T 15 "http://developers.locality.co.za/routes.txt" -O /tmp/routes.dat
sleep 7

if [ ! -f /tmp/routes.dat ]
  then
    echo ...restoring backup routes.txt file
    cp /mmc/jffs/scripts/routes.dat.bak /tmp/routes.dat
    sleep 7
fi
}

backuploclroutes () {
echo ...backing up existing routes.txt file
cp /tmp/routes.dat /mmc/jffs/scripts/routes.dat.bak
rm -rf /tmp/routes.dat
}

setloclroutes () {
echo ...setting Local routes 
for IP in `cat /tmp/routes.dat`
  do
    gpio enable 7
    route add -net $IP $LOCL
    gpio disable 7
  done
}

connect () {
gpio disable 3; sleep 1
pppd plugin /usr/lib/rp-pppoe.so $INTRFACE noipdefault noauth nodefaultroute noaccomp noccp nobsdcomp nodeflate nopcomp novj novjccomp nomppe nomppc usepeerdns user $1 password $2 default-asyncmap mtu 1492 mru 1492 persist lcp-echo-interval 60 lcp-echo-failure 10 maxfail 0 unit $3
gpio enable 3; sleep 1
}

connlinkintl () {
while true
  do
    if [ `ip link show dev ppp0 |grep ppp0 |awk '{ print $2 }'` == "ppp0:" ]
      then
        echo ...International ppp link is up
        break
      else
        echo ...waiting for International to connect
        gpio disable 3; sleep 1
        gpio enable 3; sleep 1
    fi
done
}

connlinklocl () {
while true
  do
     if [ `ip link show dev ppp1 |grep ppp1 |awk '{ print $2 }'` == "ppp1:" ]
       then
         echo ...Local ppp link is up
         break
       else
         echo ...waiting for Local to connect
         gpio disable 3; sleep 1
         gpio enable 3; sleep 1
     fi
done
}

sleep 20
cd /mmc/jffs/scripts/bwlog/
./start.sh &

echo Starting up Traffic Splitting... Please wait...
sleep 40

while true
  do
    if [ `ip link show dev ppp0 |grep ppp0 |awk '{ print $2 }'` == "ppp0:" ]
      then
         echo ...International ppp link is up
      else
         connect $INTLUSER $INTLPASS 0
         connlinkintl
         sleep 10
         setintlroutes
         setdefaultroute
    fi 
    if [ `ip link show dev ppp1 |grep ppp1 |awk '{ print $2 }'` == "ppp1:" ]
      then
         echo ...Local ppp link is up
      else 
         connect $LOCALUSER $LOCALPASS 1  
         connlinklocl
         sleep 10
         setdefaultroute
         getloclroutes
         setloclroutes
         backuploclroutes
         setdefaultroute
    fi
    if [ `ip link show dev ppp2 |grep ppp2 |awk '{ print $2 }'` == "ppp2:" ]
      then
         echo ...Resetting all ppp connections
         killall redial
         killall pppd
      else
         echo all ppp connections seems good
    fi
   echo returning to main loop...
   sleep $TIMEOUT
done

Click “Save Startup”

Firewall script:

#!/bin/sh
PATH=/usr/sbin:/sbin:/usr/bin:$PATH

iptables -t nat -I POSTROUTING -o ppp+ -j MASQUERADE

Click “Save Firewall”

Reboot your router