How to use the Linux packet generator module. 1. Enable CONFIG_NET_PKTGEN to compile and build pktgen.o, install it in the place where insmod may find it. 2. Cut script "ipg" (see below). 3. Edit script to set preferred device and destination IP address. 3a. Create more scripts for different interfaces. Up to thirty-two pktgen processes can be configured and run at once by using the 32 /proc/net/pg* files. 4. Run in shell: ". ipg" 5. After this two commands are defined: A. "pg" to start generator and to get results. B. "pgset" to change generator parameters. F.e. pgset "multiskb 1" use multiple SKBs for packet generation pgset "multiskb 0" use single SKB for all transmits pgset "pkt_size 9014" sets packet size to 9014 pgset "frags 5" packet will consist of 5 fragments pgset "count 200000" sets number of packets to send, set to zero for continious sends untill explicitly stopped. pgset "ipg 5000" sets artificial gap inserted between packets to 5000 nanoseconds pgset "dst 10.0.0.1" sets IP destination address (BEWARE! This generator is very aggressive!) pgset "dst_min 10.0.0.1" Same as dst pgset "dst_max 10.0.0.254" Set the maximum destination IP. pgset "src_min 10.0.0.1" Set the minimum (or only) source IP. pgset "src_max 10.0.0.254" Set the maximum source IP. pgset "dstmac 00:00:00:00:00:00" sets MAC destination address pgset "srcmac 00:00:00:00:00:00" sets MAC source address pgset "src_mac_count 1" Sets the number of MACs we'll range through. The 'minimum' MAC is what you set with srcmac. pgset "dst_mac_count 1" Sets the number of MACs we'll range through. The 'minimum' MAC is what you set with dstmac. pgset "flag [name]" Set a flag to determine behaviour. Current flags are: IPSRC_RND #IP Source is random (between min/max), IPDST_RND, UDPSRC_RND, UDPDST_RND, MACSRC_RND, MACDST_RND pgset "udp_src_min 9" set UDP source port min, If < udp_src_max, then cycle through the port range. pgset "udp_src_max 9" set UDP source port max. pgset "udp_dst_min 9" set UDP destination port min, If < udp_dst_max, then cycle through the port range. pgset "udp_dst_max 9" set UDP destination port max. pgset stop aborts injection Also, ^C aborts generator. ---- cut here #! /bin/sh modprobe pktgen PGDEV=/proc/net/pg/pg0 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 } pgset "odev eth0" pgset "dst 0.0.0.0" ---- cut here