I have an ipsec vpn setup between 2 Cisco 1800 routers on reasonably fast broadband links. One has 15/100 mb speed,the other has 15/50 mb speed. Between them, everything works well but Outlook communicates rather slowly with the exchange server across the link. The server does not seem to be the issue.
I want to know what is the best way to ascertain the effective network speed across These links, preferably from a workstation to the exchange server but a general sense of speed would do as well.
Netflow gives an decent grade of health, showing that utilization is not high and that 2-5 mb seems to pass regularly.
What can I use to verify clearly, and what switches should I use and how are the results interpreted? I did iperf using defaults and it showed what I think translated to about 1mb but it was in bps and I think the defaults only send at 1mb. What does everyone else use?
I've been told that a gre tunnel would be faster and have less overhead as well, thoughts?