Ostinato is a cross-platform network packet and traffic generator and analyzer with a friendly GUI. It aims to be Wireshark in Reverse and thus become complementary to Wireshark. Features custom packet crafting with any field editing support for several protocols - L2: Ethernet, 802.3, LLC SNAP, VLAN (with Q-in-Q) L3: ARP, IPv4, IPv6, IP-in-IP (a.k.a IP Tunneling) L4: TCP, UDP, ICMPv4, ICMPv6 L5: HTTP, SIP, RTSP, NNTP etc. Useful for both functional and performance testing. Works on Windows, Linux and Mac OS X. See the Homepage for a full list of features.

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