Ubiquiti USG L2TP VPN throughput

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wratterus

1687 posts

Uber Geek

#273123 5-Aug-2020 15:06

Wondering if anyone here is using a USG and has an IPSec L2TP VPN setup - wondering what sort of throughput you are seeing.

There are countless threads on Ubiquiti's forums about it, but difficult to get any proper info. Connecting here from either Windows or Apple clients.

Using ER-X in the past (without hardware offloading cause it's still broken) I seem to get around 30 - 35mbps both ways, which isn't bad considering.

With the USG (and I've confirmed offloading is enabled) I seem to get around 50mbps down, but only around 10mbps up.

Keen to hear from anyone who's got one setup in the same way, to see what sort of speeds you're seeing through the VPN.

Thanks!

pistol

39 posts

Geek
Inactive user

#2535235 5-Aug-2020 15:15

Honestly,
Setup Wireguard on a Pi4 then just forward the port on the USG.

Not sure on the full speeds possible but just ran a test from where I am which shows no performance impact with it on/off. Connection here is around 300Mbps

nztim

3824 posts

Uber Geek

ID Verified

Trusted

TEAMnetwork

Subscriber

#2535250 5-Aug-2020 15:43

I am by no means a USG expert but with VPNs in general have you checked the MTU size?

1492 for IPoE and even lower for PPPoE

Any views expressed on these forums are my own and don't necessarily reflect those of my employer.

wratterus

1687 posts

Uber Geek

#2535267 5-Aug-2020 15:54

Good thought, I was under the impression that Spark recommend 1500 now - the USG currently is on the default (1492), so I could try tweaking that. Actual speeds through the USG are mint, around 900/350 on Spark gigabit fibre last time I did a random speedtest.

I don't really understand the MSS MTU relationship well, but I think MSS - 40 (for the headers) = MTU, so I could try and set 1460 in the MSS clamping and see what happens, in theory that would give me a MTU of 1500 I think.