WAN File Transfer Speeds

[ITGURU]

Hi

We have several sites within our Trust all connected via 1GB leased lines. One of our more remote sites connects via TTB then into the network.

We get full 1GB throughput/download from the internet, however to/from the one site when we transfer files via SMB/UNC path we get dismal speeds of 50mb/s and inconsistent.

If i run iperf, I get the same result. However if i transfer via SFTP i can get the full throughput.

To that particular site the ping response time is 24ms, however between all our other sites they are 1ms.

I'm told this is expected as is a case of Long Fat network.

Does anyone else have a MAT where they don't see the full throughput to/from sites that have slightly higher latency?

thanks in advance.

[FN-GM]

What WAN technology is this? Is it SD-WAN, MPLS, Site-to-Site VPN, private circuit etc?

[PaddyNewman]

What does a UDP iPerf give you? I have seen previously on a specific connection that was ~27ms going to our DC for iPerf was hitting 550Mbps constant, never higher. A change of traffic path bringing that down to 15/16ms gave us the full banana. UDP iPerf seems to show the full speed, but TCP being the full handshake, window scaling, seeing what it can do over that connection, it will see limitations. Odd SFTP is fine though.

[MatthewL]

If you are using site to site VPN some hardware does have limits on speed also got to factor in other traffic that maybe using the connection when testing.