Wireshark · Wireshark-users: Re: [Wireshark-users] How to figure out openssl's tls packet sequences ??

["Prokash Sinha" <prokashs@xxxxxxxxx>]

Thanks much Stephen. That leftmost button tells me a lot...

 

On that there is a tab selection for offload... And I see the kinds of offload (i.e TCP/IP checksum, TCP large send ).

 

Since we I'm interested here for checksum: For TCP calculation supported is YES, and options fields supported Yes. For UDP it is (Yes, nothing-no options )... I don't know what is/are options fields, but I guess I can now carryon .. looking for them on my own ...

 

BTW, on a secure connection ( just using openssl ), the packet sequences are a little different, and I still see the incorrect checksum warning like the one I was getting under SIP/SSL, but the data flies thru one end to other quite nicely ...

 

Thanks a bunch to both of you Stephen and Luis...

 

Appreciate it.

 

-pro

On Thu, Sep 25, 2008 at 2:51 PM, Stephen Fisher <stephentfisher@xxxxxxxxx> wrote:

On Thu, Sep 25, 2008 at 02:43:12PM -0700, Prokash Sinha wrote:

> Also for tcp checksum, under windows it is showing intel pro/1000 mt,
> and it is more like a mother board controller (rather than a daughter
> card). Gooling seems to make me feel that it has offloading
> capabilities, but could not find anything particular to look at using
> Device manger for the controller...

When running Wireshark under Windows, you can view a screen that gives
information on IP, TCP, UDP checksum offloading for your network card.
Click on the Interfaces toolbar button (left most button) and click on
Details for your card and look under Task Offload.


Steve

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