With pktgen , you can send small packets , such as 64bytes packets , and you can also assign a CPU core to a specific NIC for generating traffic.
I just referred to http://www.linuxfoundation.org/collaborate/workgroups/networking/pktgen. many thanks !
| # uname –ri 3.2.0-34-virtual x86_64 # lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.04.1 LTS Release: 12.04 Codename: precise |
confirm pktgen module has been installed.
| # modinfo pktgen filename: /lib/modules/3.2.0-34-virtual/kernel/net/core/pktgen.ko version: 2.74 license: GPL description: Packet Generator tool author: Robert Olsson <robert.olsson@its.uu.se> srcversion: B34DE3D9C4CC746E0B50842 depends: intree: Y vermagic: 3.2.0-34-virtual SMP mod_unload modversions parm: pg_count_d:Default number of packets to inject (int) parm: pg_delay_d:Default delay between packets (nanoseconds) (int) parm: pg_clone_skb_d:Default number of copies of the same packet (int) parm: debug:Enable debugging of pktgen module (int) |
Network topology
| -- eth1 ubuntu eth2 -- | | ----------- vSW --------- |
eth1 : 192.168.30.100 , MAC 52:54:00:14:d3:f1
eth2 : 192.168.30.101 , MAC 52:54:00:cd:fb:85
eth1 and eth2 are in the same VLAN.
download sample script from ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/examples/
| # wget ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/examples/pktgen.conf-2-2 |
pktgen.conf-2-2 is a sample script for 2 CPUs , 2 NICs.
My Ubuntu VM has 2 vCPUs and 2 vNICs , so I’ll use this script.
| # mv pktgen.conf-2-2 pktgen.conf-2-2.sh # chmod u+x pktgen.conf-2-2.sh |
edit pktgen.conf-2-2.sh
I edited red line.
| #!/bin/sh #modprobe pktgen 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 eth1" pgset "add_device eth1" 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 eth2" pgset "add_device eth2" 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/eth1 echo "Configuring $PGDEV" pgset "$COUNT" pgset "$CLONE_SKB" pgset "$PKT_SIZE" pgset "$DELAY" pgset "dst 192.168.30.101" pgset "dst_mac 52:54:00:cd:fb:85" PGDEV=/proc/net/pktgen/eth2 echo "Configuring $PGDEV" pgset "$COUNT" pgset "$CLONE_SKB" pgset "$PKT_SIZE" pgset "$DELAY" pgset "dst 192.168.30.100" pgset "dst_mac 52:54:00:14:d3:f1" # Time to run PGDEV=/proc/net/pktgen/pgctrl echo "Running... ctrl^C to stop" pgset "start" echo "Done" # Result can be vieved in /proc/net/pktgen/eth[1,2] |
run the script
error
| # ./pktgen.conf-2-2.sh ./pktgen.conf-2-2.sh: 6: ./pktgen.conf-2-2.sh: Syntax error: "(" unexpected |
edit the script
from
| 1 #!/bin/sh |
to
| 1 #!/bin/bash |
run the script again.
| # ./pktgen.conf-2-2.sh Removing all devices Adding eth1 Setting max_before_softirq 10000 Removing all devices Adding eth2 Setting max_before_softirq 10000 Configuring /proc/net/pktgen/eth1 Configuring /proc/net/pktgen/eth2 Running... ctrl^C to stop |
- stats
eth1
| # cat /proc/net/pktgen/eth1 Params: count 10000000 min_pkt_size: 60 max_pkt_size: 60 frags: 0 delay: 0 clone_skb: 1000000 ifname: eth1 flows: 0 flowlen: 0 queue_map_min: 0 queue_map_max: 0 dst_min: 192.168.30.101 dst_max: src_min: src_max: src_mac: 52:54:00:14:d3:f1 dst_mac: 52:54:00:cd:fb:85 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: 612783 errors: 0 started: 4718340134us stopped: 4736156921us idle: 232438us seq_num: 612784 cur_dst_mac_offset: 0 cur_src_mac_offset: 0 cur_saddr: 0x641ea8c0 cur_daddr: 0x651ea8c0 cur_udp_dst: 9 cur_udp_src: 9 cur_queue_map: 0 flows: 0 |
eth2
| # cat /proc/net/pktgen/eth2 Params: count 10000000 min_pkt_size: 60 max_pkt_size: 60 frags: 0 delay: 0 clone_skb: 1000000 ifname: eth2 flows: 0 flowlen: 0 queue_map_min: 0 queue_map_max: 0 dst_min: 192.168.30.100 dst_max: src_min: src_max: src_mac: 52:54:00:cd:fb:85 dst_mac: 52:54:00:14:d3:f1 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: 878218 errors: 0 started: 4718340133us stopped: 4775020348us idle: 5393504us seq_num: 878219 cur_dst_mac_offset: 0 cur_src_mac_offset: 0 cur_saddr: 0x651ea8c0 cur_daddr: 0x641ea8c0 cur_udp_dst: 9 cur_udp_src: 9 cur_queue_map: 0 flows: 0 Result: Starting |
packet cap data
| # tshark -V -r aaa.pcap -R '(frame.number == 1)' Frame 1: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) Arrival Time: Dec 1, , 2012 07:03:25.510239000 UTC Epoch Time: 1354518205.510239000 seconds [Time delta from previous captured frame: 0.000000000 seconds] [Time delta from previous displayed frame: 0.000000000 seconds] [Time since reference or first frame: 0.000000000 seconds] Frame Number: 1 Frame Length: 60 bytes (480 bits) Capture Length: 60 bytes (480 bits) [Frame is marked: False] [Frame is ignored: False] [Protocols in frame: eth:ip:udp:pktgen:data] Ethernet II, Src: RealtekU_cd:fb:85 (52:54:00:cd:fb:85), Dst: RealtekU_14:d3:f1 (52:54:00:14:d3:f1) Destination: RealtekU_14:d3:f1 (52:54:00:14:d3:f1) Address: RealtekU_14:d3:f1 (52:54:00:14:d3:f1) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default) Source: RealtekU_cd:fb:85 (52:54:00:cd:fb:85) Address: RealtekU_cd:fb:85 (52:54:00:cd:fb:85) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default) Type: IP (0x0800) Internet Protocol Version 4, Src: 192.168.30.101 (192.168.30.101), Dst: 192.168.30.100 (192.168.30.100) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport)) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00) Total Length: 46 Identification: 0x0000 (0) Flags: 0x00 0... .... = Reserved bit: Not set .0.. .... = Don't fragment: Not set ..0. .... = More fragments: Not set Fragment offset: 0 Time to live: 32 Protocol: UDP (17) Header checksum: 0xdca5 [correct] [Good: True] [Bad: False] Source: 192.168.30.101 (192.168.30.101) Destination: 192.168.30.100 (192.168.30.100) User Datagram Protocol, Src Port: discard (9), Dst Port: discard (9) Source port: discard (9) Destination port: discard (9) Length: 26 Checksum: 0x0000 (none) [Good Checksum: False] [Bad Checksum: False] Linux Kernel Packet Generator Magic number: 0xbe9be955 Sequence number: 1 [Timestamp tvsec: 1354518173] [Timestamp tvusec: 956631] Timestamp: Dec 1, , 2012 07:02:53.956631000 UTC Data (2 bytes) 0000 00 00 .. Data: 0000 [Length: 2] |
when changing packet size from 64 to 1518
| # NIC adds 4 bytes CRC #PKT_SIZE="pkt_size 60" PKT_SIZE="pkt_size 1514" |
packet cap data
| # tshark -V -r zz.pcap -R '(frame.number == 1)' Frame 1: 1514 bytes on wire (12112 bits), 1514 bytes captured (12112 bits) Arrival Time: Dec 1, , 2012 07:23:48.510236000 UTC Epoch Time: 1354519428.510236000 seconds [Time delta from previous captured frame: 0.000000000 seconds] [Time delta from previous displayed frame: 0.000000000 seconds] [Time since reference or first frame: 0.000000000 seconds] Frame Number: 1 Frame Length: 1514 bytes (12112 bits) Capture Length: 1514 bytes (12112 bits) [Frame is marked: False] [Frame is ignored: False] [Protocols in frame: eth:ip:udp:pktgen:data] Ethernet II, Src: RealtekU_cd:fb:85 (52:54:00:cd:fb:85), Dst: RealtekU_14:d3:f1 (52:54:00:14:d3:f1) Destination: RealtekU_14:d3:f1 (52:54:00:14:d3:f1) Address: RealtekU_14:d3:f1 (52:54:00:14:d3:f1) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default) Source: RealtekU_cd:fb:85 (52:54:00:cd:fb:85) Address: RealtekU_cd:fb:85 (52:54:00:cd:fb:85) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default) Type: IP (0x0800) Internet Protocol Version 4, Src: 192.168.30.101 (192.168.30.101), Dst: 192.168.30.100 (192.168.30.100) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport)) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00) Total Length: 1500 Identification: 0x0000 (0) Flags: 0x00 0... .... = Reserved bit: Not set .0.. .... = Don't fragment: Not set ..0. .... = More fragments: Not set Fragment offset: 0 Time to live: 32 Protocol: UDP (17) Header checksum: 0xd6f7 [correct] [Good: True] [Bad: False] Source: 192.168.30.101 (192.168.30.101) Destination: 192.168.30.100 (192.168.30.100) User Datagram Protocol, Src Port: discard (9), Dst Port: discard (9) Source port: discard (9) Destination port: discard (9) Length: 1480 Checksum: 0x0000 (none) [Good Checksum: False] [Bad Checksum: False] Linux Kernel Packet Generator Magic number: 0xbe9be955 Sequence number: 1 [Timestamp tvsec: 1354519422] [Timestamp tvusec: 424679] Timestamp: Dec 1, , 2012 07:23:42.424679000 UTC Data (1456 bytes) 0000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ <snip> [Length: 1456] |
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