Get TCPView from sysinternals.com Eric S --------snip---------------
> There is no "comfortable" way to watch open TCP connections. You can open a > command line and type in "netstat -n 5". This will show you all open > connections. Durring normal/low workload there should only be some few > connections from the local IP and a port between 1024 and 5000 (with the > default settings) or a value up to 64000 (if you've changed the MaxUserPort > registry value) > > Here is the setup of my test enviroment > > Host1: Sender > A windows machine (can also be a client windows on you notebook) > This has running the IIS SMTP service configured to send all messages trough > a smart host. (Host2) > Attached is a small vbscript that can be used to generate a certain number > of test messages with a variable delay between each message. > > Host2: The Imail Server > This Server is configured to relay for a certain IP (Host3) The MX for the > recipient domain of the test messages points to Host3 or the hosts file on > Host2 has an entry that points the recipient domain to the host3's IP. The > Imail-configuration does NOT contain any virt.Server of the test domain. (a > tipical gateway configuration) > So each test message creates two connections (one from host1 to host2 and > one from host2 to host3) on the Imail server. If you have enough information > on host1 (for example a logfile or a spool folder) then you can also check > if host2 was not able to accept all incomming messages maybe without > notifying you in the logfiles. > > Host3: Receiver > This host does nothing else then receiving all test messages and store them > in a pop3 mailbox, so that we can count if 100% of al send messages on Host1 > is also arriving successfully on Host3. > > Note: > Durring this test you should watch also your CPU usage values as a real > overload (depends on amount of processed messages and your hardware/network > configuration) will create delivery failures in any way. > > Happy testing! > I'm pretty sure this will happen with each server independent of the used > NIC if the number of processed messages into a certain timerange (240 > seconds) is high enough. > > Markus > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
