Pktgen – a tool to generate packets at very high speed in the kernel

My environment: RedHat Fedora Core 8 x86_64

Firstly check if your pktgen is running:

[root@pandaeatsbamboo pktgen]# ps -e | grep pktgen
8913 ?        00:01:55 kpktgend_0
8914 ?        00:01:55 kpktgend_1
8915 ?        00:00:01 kpktgend_2
8916 ?        00:00:01 kpktgend_3

I have a quad-core AMD CPU therefore you will see 4 processes there.  Pktgen creates 1 thread per CPU.

If you can’t see that, try to:
modprobe pktgen

I have 2 NIC card, eth0 and eth1, here is my sample shell script to kick start the pktgen:

#! /bin/sh

#modprobe pktgen

function pgset() {

    local result

    echo $1 > $PGDEV

    result=`cat $PGDEV | fgrep "Result: OK:"`

    if [ "$result" = "" ]; then

         cat $PGDEV | fgrep Result:

    fi

}

function pg() {

    echo inject > $PGDEV

    cat $PGDEV

}

# Config Start Here -----------------------------------------------------------

# thread config

# Each CPU has own thread. Two CPU exammple. We add eth1, eth2 respectivly.

PGDEV=/proc/net/pktgen/kpktgend_0

  echo "Removing all devices"

 pgset "rem_device_all"

  echo "Adding eth0"

 pgset "add_device eth0"

  echo "Setting max_before_softirq 10000"

 pgset "max_before_softirq 10000"

PGDEV=/proc/net/pktgen/kpktgend_1

  echo "Removing all devices"

 pgset "rem_device_all"

  echo "Adding eth1"

 pgset "add_device eth1"

  echo "Setting max_before_softirq 10000"

 pgset "max_before_softirq 10000"

# device config

# delay 0 means maximum speed.

CLONE_SKB="clone_skb 1000000"

# NIC adds 4 bytes CRC

PKT_SIZE="pkt_size 60"

# COUNT 0 means forever

#COUNT="count 0"

COUNT="count 10000000"

DELAY="delay 0"

PGDEV=/proc/net/pktgen/eth0

  echo "Configuring $PGDEV"

 pgset "$COUNT"

 pgset "$CLONE_SKB"

 pgset "$PKT_SIZE"

 pgset "$DELAY"

 pgset "dst 168.106.1.248"

 pgset "dst_mac  00:24:51:13:06:41"

PGDEV=/proc/net/pktgen/eth1

  echo "Configuring $PGDEV"

 pgset "$COUNT"

 pgset "$CLONE_SKB"

 pgset "$PKT_SIZE"

 pgset "$DELAY"

 pgset "dst 192.168.10.1"

 pgset "dst_mac  00:24:51:13:06:43"

# Time to run

PGDEV=/proc/net/pktgen/pgctrl

 echo "Running... ctrl^C to stop"

 pgset "start"

 echo "Done"

To view the statistics, check the files in /proc/net/pktgen/ethX

[root@pandaeatsbamboo pktgen]# less /proc/net/pktgen/eth0

Params: count 10000000  min_pkt_size: 60  max_pkt_size: 60

     frags: 0  delay: 0  clone_skb: 1000000  ifname: eth0

     flows: 0 flowlen: 0

     queue_map_min: 0  queue_map_max: 0

     dst_min: 168.106.1.248  dst_max:

     src_min:   src_max:

     src_mac: 00:1f:d0:50:19:6d dst_mac: 00:24:51:13:06:41

     udp_src_min: 9  udp_src_max: 9  udp_dst_min: 9  udp_dst_max: 9

     src_mac_count: 0  dst_mac_count: 0

     Flags:

Current:

     pkts-sofar: 10000000  errors: 0

     started: 1244025262231283us  stopped: 1244025310237392us idle: 11640574us

     seq_num: 10000001  cur_dst_mac_offset: 0  cur_src_mac_offset: 0

     cur_saddr: 0xfa016aa8  cur_daddr: 0xf8016aa8

     cur_udp_dst: 9  cur_udp_src: 9

     cur_queue_map: 0

     flows: 0

Result: OK: 48006109(c36365535+d11640574) usec, 10000000 (60byte,0frags)

  208306pps 99Mb/sec (99986880bps) errors: 0

To learn more you can visit here:

http://www.linuxfoundation.org/en/Net:Pktgen