FYI, I am trying to open a Unix snoop on the Ehtereal, from a Sun Sparc 9 box...
On Tue, 03 Feb 2004 Guy Harris wrote : > >On Feb 2, 2004, at 8:28 PM, Jonty Ray wrote: > >> Have Ethereal 0.10.1 and The h225 setup msg appears as unreassembled packet ( >> incorrect TCP check sum ) > >You're probably capturing traffic being sent by the machine running Ethereal, and the >machine probably has a network interface that does checksum offloading. Packets sent >on an interface that does checksum offloading, when they're captured by the machine >sending the packet, don't have a valid checksum - the host hasn't given the packet a >checksum, as it's letting the network interface do that. > >Select "Preferences" from the "Edit" menu, open up the "Protocols" list, select >"TCP", turn off the "Check the validity of the TCP checksum when possible" option, >and click "OK" (click "Save" before you click "OK" if you want this to be your >default setting). > >That causes Ethereal not to check whether the TCP checksum is valid on a packet, so >that it'll be willing to reassemble higher-level packets across TCP segment >boundaries even if the checksum appears to be bad. > >> All other msgs like call proceeding and alerting appear fine. > >Those messages are probably small enough that they don't cross TCP segment boundaries. >
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