Bandwidth share using tc
========================

Public domain
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    #!/usr/bin/bash
    # Userside interface = $INTIF = receive of user = $DOWNLINK control
    # Internet interface = $EXTIF = send of user = $UPLINK control
    # Users = 172.16.20.10 172.16.20.254 
    
    INTIF="eth0"
    EXTIF="eth1"
    
    DOWNLINK="128"
    UPLINK="64"
    
    MINDOWN="28"
    MINUP="10"
    
    LAN="172.16.20.10 172.16.20.254" 
    
    iptables -t mangle -F
    tc qdisc del dev ${INTIF} root > /dev/null 2>&1
    tc qdisc del dev ${EXTIF} root > /dev/null 2>&1
    
    tc qdisc add dev ${INTIF} root handle 1: htb 
    tc qdisc add dev ${EXTIF} root handle 1: htb
    
    
    tc class add dev ${INTIF} parent 1: classid 1:1 htb rate ${DOWNLINK}kbit ceil ${DOWNLINK}kbit
    tc class add dev ${EXTIF} parent 1: classid 1:1 htb rate ${UPLINK}kbit ceil ${UPLINK}kbit
    
    
    COUNT=1
    HANDLE=1
    for IP in $LAN; do
    
      tc class add dev ${INTIF} parent 1:1 classid 1:1${COUNT} htb rate ${MINDOWN}kbit ceil ${DOWNLINK}kbit
      tc filter add dev ${INTIF} parent 1: protocol ip prio 1 handle ${HANDLE} fw classid 1:1${COUNT}
      iptables -t mangle -A FORWARD -o ${INTIF} -d ${IP} -j MARK --set-mark ${HANDLE}
    
      HANDLE=$( expr ${HANDLE} + 1 )
    
      tc class add dev ${EXTIF} parent 1:1 classid 1:1${COUNT} htb rate ${MINUP}kbit ceil ${UPLINK}kbit
      tc filter add dev ${EXTIF} parent 1: protocol ip prio 1 handle ${HANDLE} fw classid 1:1${COUNT}
      iptables -t mangle -A FORWARD -o ${EXTIF} -s ${IP} -j MARK --set-mark ${HANDLE}
    
      COUNT=$( expr ${COUNT} + 1 )
      HANDLE=$( expr ${HANDLE} + 1 )
    
    done
    
    
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_BY: Pejman Moghadam_  
_TAG: tc, iptables, bash-script, bash, traffic-control_  
_DATE: 2007-11-27 00:18:06_