Using iPerf to test IPSec VPN tunnel

VPN
1

I’m sure it is something simple on my part that I am missing, but I am trying to use iPerf to test a VPN tunnel between 2 locations. I have added rules for port 5201 on each computer on each side of the VPN tunnel. I also created Access and NAT rules on the sonicwall routers that I am using on each side.

Despite this, I continue to get the following message when trying to use iPerf:

iperf3: error - unable to connect to server - server may have stopped running or use a different port, firewall issue, etc.: Connection timed out

I am able to ping, use Remote Desktop, and access network drives through the VPN. I see that iPerf seems rather simple to use, so it really seems like user error on my part.

2

Did you check with Packet monitor on both Sonicwalls to see if there’s blocked traffic?

Does wireshark see the traffic on both devices?

Whats the command you’re running to start iperf server and client?

3

The Windows firewall was treating my domain network as a public network, preventing the traffic from going through.