Wireshark 1.2.2

Wireshark (also known as Ethereal) is a network protocol analyzer that enables you to capture and examine data from a live network or from a capture file on disk. You can interactively browse the capture data and view summary and detail information for each packet. Wireshark has several powerful features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session. It can read capture files from tcpdump (libpcap), NAI Sniffer (compressed and uncompressed), Sniffer Pro, NetXray, snoop, Shomiti Surveyor, AIX s iptrace, Microsoft Network Monitor, Novell s LANalyzer, RADCOM s WAN/LAN Analyzer, HP-UX nettl, ISDN4BSD, Cisco Secure IDS iplog, the pppd log (pppdump-format), and the AG Group s/Wildpacket Etherpeek. It can also read traces made from Lucent/Ascend WAN routers and Toshiba ISDN routers. Any of these files can be compressed with gzip and Wireshark will decompress them on the fly.

Bugs fixed:

  • The GSM A RR dissector could crash. (Bug 3893) Versions affected: 1.2.0 to 1.2.1
  • The OpcUa dissector could use excessive CPU and memory. (Bug 3986) Versions affected: 0.99.6 to 1.0.8, 1.2.0 to 1.2.1
  • The TLS dissector could crash on some platforms. (Bug 4008) Versions affected: 1.2.0 to 1.2.1

News source: Official website
Download: Wireshark 1.2.2
View: Release notes

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It will capture the packets recieved on the NIC you are monitoring. As such if you've got 5 computers all plugged into an 8 port hub you'll see everything (pretty much). However if you have a switch you'll only see ARP requests from/to other computers (plus data destined/sent from the PC Wireshark is installed on.)