Nemesis is a command line, portable "human IP stack". It can be useful for easy injection of packet streams from simple shell scripts. It supports 8 protocols (ARP, DNS, ICMP, IGMP, OSPF, RIP, TCP, UDP), and packets can be injected on either Layer 2 or Layer 3. * nemesis-tcp -v -S 192.168.1.1 -D 192.168.2.2 -fS -fA -y 22 -P foo send TCP packet (SYN/ACK) with payload from ascii file 'foo' to target's ssh port from 192.168.1.1 to 192.168.2.2. (-v allows a stdout visual of current injected packet) * nemesis-icmp -S 10.10.10.3 -D 10.10.10.1 -G 10.10.10.3 -i 5 send ICMP REDIRECT (network) packet from 10.10.10.3 to 10.10.10.1 with preferred gateway as source address. * nemesis-arp -v -d ne0 -H 0:1:2:3:4:5 -S 10.11.30.5 -D 10.10.15.1 send ARP packet through device 'ne0' from hardware source address 00:01:02:03:04:05 with IP source address 10.11.30.5 to destination IP address 10.10.15.1 with broadcast destination hardware address. In other words, who-has the mac address of 10.10.15.1, tell 10.11.30.5 - assuming 00:01:02:03:04:05 is the source mac address of our 'ne0' device. WWW: http://celerity.bartoli.org/nemesis/