The name might be new, but the software is the same. Wireshark's powerful features make it the tool of choice for network troubleshooting, protocol development, and education worldwide.

Wireshark was written by networking experts around the world, and is an example of the power of open source. It runs on Windows, Linux, UNIX, and other platforms. This download is for Windows only.

Wireshark can read live data from Ethernet, Token-Ring, FDDI, serial (PPP and SLIP) (if the OS on which it's running allows Wireshark to do so), 802.11 wireless LAN (if the OS on which it's running allows Wireshark to do so) and ATM connections (if the OS on which it's running allows Wireshark to do so).
OS: Win 2000/XP/2003/Vista
Whats new:
Bug Fixes
The following vulnerabilities have been fixed. See the security advisory for details and a workaround.
Wireshark could crash when reading an MP3 file.
Versions affected: 0.99.6
Beyond Security discovered that Wireshark could loop excessively while reading a malformed DNP packet.
Versions affected: 0.10.12 to 0.99.6
Stefan Esser discovered a buffer overflow in the SSL dissector.
Versions affected: 0.99.0 to 0.99.6
The ANSI MAP dissector could be susceptible to a buffer overflow on some platforms.
Versions affected: 0.99.5 to 0.99.6
The Firebird/Interbase dissector could go into an infinite loop or crash.
Versions affected: 0.99.6
The NCP dissector could cause a crash.
Versions affected: 0.99.6
The HTTP dissector could crash on some systems while decoding chunked messages.
Versions affected: 0.10.14 to 0.99.6
The MEGACO dissector could enter a large loop and consume system resources.
Versions affected: 0.9.14 to 0.99.6
The DCP ETSI dissector could enter a large loop and consume system resources.
Versions affected: 0.99.6
Fabiodds discovered a buffer overflow in the iSeries (OS/400) Communication trace file parser.
Versions affected: 0.99.0 to 0.99.6
The PPP dissector could overflow a buffer.
Versions affected: 0.99.6
The Bluetooth SDP dissector could go into an infinite loop.
Versions affected: 0.99.2 to 0.99.6
A malformed RPC Portmap packet could cause a crash.
Versions affected: 0.8.16 to 0.99.6
The IPv6 dissector could loop excessively.
Versions affected: 0.99.6
The USB dissector could loop excessively or crash.
Versions affected: 0.99.6
The SMB dissector could crash.
Versions affected: 0.99.6
The RPL dissector could go into an infinite loop.
Versions affected: 0.9.8 to 0.99.6
The WiMAX dissector could crash due to unaligned access on some platforms.
Versions affected: 0.99.6
The CIP dissector could attempt to allocate a huge amount of memory and crash.
Versions affected: 0.9.14 to 0.99.6
The following bugs have been fixed:
Handling of non-ASCII file names and paths has been improved.
Wireshark could crash while editing a coloring rule or a UAT table.
The display filter code could crash while bitwise ANDing an IPv4 address.

New and Updated Features
The following features are new (or have been significantly updated) since the last release:
Most of the capture code has been moved out of the GUI, which means that Wireshark no longer needs to be run as root.
Many display filter names have been cleaned up. If your favorite display filter just went missing, please consult the display filter reference to find out where it ended up.
You can now filter directly on SNMP OIDs.
IO graphs have more display options, and you can now export graphs.
You can now follow UDP streams in addition to TCP and SSL streams.
You can now disable coloring rules without deleting them.
Main window toolbar buttons are now available even when the window is small.
The version of WinPcap that ships with the Windows installers has been updated to 4.0.2.
The Windows installers now include a "services" file, which maps port numbers to names.
The Windows installer now enables npf.sys by default under Vista. Wireshark will print a warning at startup if npf.sys isn't loaded under Vista.
Optimizations have been applied in some places to make Wireshark start up and run faster.

New Protocol Support
ANSI TCAP, application/xcap-error (MIME type), CFM, DPNSS, EtherCAT, ETSI e2/e4, H.282, H.460, H.501, IEEE 802.1ad and 802.1ah, IMF (RFC 2822), RSL, SABP, T.125, TNEF, TPNCP, UNISTIM, Wake on LAN, WiMAX ASN Control Plane, X.224,
Updated Protocol Support
3Com XNS, 3G A11, ACN, ACP123, ACSE, AIM, ANSI IS-637-A, ANSI MAP, Armagetronad, BACapp, BACnet, BER, BFD, BGP, Bluetooth, CAMEL, CDT, CFM, CIP, Cisco ERSPAN, CLNP, CMIP, CMS, COPS, CTDB, DCCP, DCERPC ATSVC, DCERPC PNIO, DCERPC SAMR, DCERPC, DCOM CBA-ACCO, DCP ETSI, DEC DNA, DFS, DHCP/BOOTP, DHCPv6, DIAMETER, DISP, DMP, DNP, DNS, DOP, DTLS, DUA, eDonkey, ELSM, ESL, Ethernet, FC ELS, FC, FCOE, FTAM, FTP, GDSDB, GIOP, GPRS-LLC, GSM A, GSM MAP, GTP, HSRP, HTTP, IAX2, ICMPv6, IEEE 802.11, INAP, IP, IPMI, IPv6, ISAKMP, ISIS, iSNS, ISUP, IUUP, JXTA, K12, Kerberos, L2TP, LAPD, LDAP, LINX, LPD, LWAPP, MEGACO, MIKEY, MIME Multipart, MMS, MP2T, MPEG PES, MPEG, MTP2, MySQL, NBAP, NetFlow, nettl, NFS, NSIP, OSPF, P_MUL, PANA, PER, PKCS#12, PMIPv6, PN-PTCP, PN-RT, PPI, PPPoE, PRES, PROFINET, PTP, Q.932 ROS, Q.932, QSIG, Radiotap, RADIUS, RANAP, RNSAP, ROS, RTCP, RTP, RTSE, RTSP, SCCP, SCTP, SDP, SIGCOMP, SIP, Slow Protocols, SMB, SMPP, SMTP, SNDCP, SNMP, SRP, SSL, STANAG 4406, STUN2, TCAP, TCP, text/media, TIPC, ULP, UMA, UMTS FP, V5UA, VNC, WiMAX M2M, WiMAX, WLCCP, X.411, X.420, X.509 SAT, XML,

New and Updated Capture File Support
Catapult DCT 2000, Endace ERF, Juniper NetScreen snoop, Visual Networks, Windows Sniffer (NetXRay)