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What iperf speeds are you getting with UDP?

On windows you can use the test-connection -MTUSize powershell command to figure out the correct mtu.

If your udp speeds are normal but your tcp speeds are not, it could be fragmentation, or out of order packets, or high latency.

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stavefajl@feddit.dk ⁨3⁩ ⁨days⁩ ago
I’m on linux on all devices. I tested packet fragmentation using:
ping -M do -s [packet size] [ip] No fragmentation using packet size 1472 and below (before wireguard overhead).

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stavefajl@feddit.dk ⁨3⁩ ⁨days⁩ ago
I just tested again:

no wireguard, tcp: 9.75 Mbits/s

no wireguard, udp: 1.05 Mbits/s

wireguard, tcp: 248 Kbits/s

wireguard, udp: 1.05 Mbits/s

So, I get the “full” udp speed, but I get some errors / warnings about ‘connection refused’ and ‘did not receive ack’. Obviously not correctly configured, when it is 10 times slower than tcp.
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- Brkdncr@lemmy.world ⁨3⁩ ⁨days⁩ ago
  What’s your mtu inside the vpn?
  
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  - stavefajl@feddit.dk ⁨3⁩ ⁨days⁩ ago
    MTU is 1440.
    
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