Wednesday 17 August 2022

Windows transfer speed slow in one direction over VPN

Copy files A -> B was fine

but B-> A was slow


Checked all the devices, VPN all looking good. It sended up being a simple duplex issue. The link from the switch to the firewall on side B was auto'd to half-100. I hard coded it to 1000 full and all was good.


Steps to follow

Check the full network path from side A<->B is speed/duplex correct on switchports.

RAM+CPU good on each device that is moving the data

Run speed test to make sure internet connetions are ok

Run some ping -t to watchout for packet loss

smokeping or pingplotter several places local, across vpn, internet (1.1.1.1,8.8.8.8,4.2.2.2) for packet loss + latency

Check if Server is VM and check vmware for datastore for any issues

Check for arp issues, is there arp poisoning or static arp entry somewhere, is the mac address hopping around for one of the source/destination IP

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