RayMitchell wrote:
> I just installed Wireshark on WinXP and I have a question. I have
> Internet access through a cable modem and, thus, I have a LAN IP
> address (192.168.1.102) as well as an Internet DHCP IP address. I
> have a mail server running on my machine that is only visible to the
> LAN. The various email clients on my machine (Eudora, Outlook, etc.)
> seem to work fine using the LAN mail server for local email to each
> other as well as the mail server supplied by my ISP for Internet
> email. When I run Wireshark I can see all the email and other
> activity between my LAN machine and the Internet but absolutely no
> activity between my LAN mail server and any of the LAN mail clients,
I.e., when you run Wireshark on a particular machine, you see no traffic
between two programs running on that same machine?
That traffic is not supplied to the mechanism that WinPcap uses to do
packet capture; as Wireshark uses WinPcap to capture packets, that means
that Wireshark won't see that traffic.
See
http://wiki.wireshark.org/CaptureSetup/Loopback
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