Simple Packet Sender (SPS) is a Linux packet crafting tool. It supports IPv4, IPv6 including extension headers, and tunneling IPv6 over IPv4. It does not require pcap. It features packet crafting and sending one, multiple, or flooding IPv4 and IPv6 packets of type TCP, ICMP, or UDP (or cycling through all three). All values within an Ethernet frame can be modified arbitrarily. It supports IPv4 header options, TCP header options, and TCP, ICMP, and UDP data as well, input from either a keyboard as UTF-8/ASCII, a keyboard as hexadecimal, or from a file. IPv6 support includes hop-by-hop, "first" and "last" destination, routing, authentication, and encapsulating security payload (ESP) extension headers. For those without access to a native IPv6 network, IPv6 packets can be transmitted over IPv4 (6to4). Packet fragmentation is available for IPv4, IPv6, and 6to4. The assumed maximum transmission unit (MTU) can be changed if unusual fragment sizes are needed. IP addresses and port numbers can be randomized.