Hello.
I’m using WireGuard(UDP) to connect my three VPS together, one of which is DigitalOcean’s droplet. And I noticed that when I’m using iPerf3 to test DigitalOcean’s inbound bandwidth, the speed dropped to nearly zero after 1-2 seconds. Here is the output of iPerf3 (on my another VPS): (10.200.200.2 is the IP of DigitalOcean’s droplet connected with WireGuard)
$ iperf3 -c 10.200.200.2
Connecting to host 10.200.200.2, port 5201
[ 4] local 10.200.200.1 port 43684 connected to 10.200.200.2 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 33.6 MBytes 281 Mbits/sec 4 2.48 MBytes
[ 4] 1.00-2.00 sec 0.00 Bytes 0.00 bits/sec 27 2.45 MBytes
[ 4] 2.00-3.00 sec 0.00 Bytes 0.00 bits/sec 27 2.41 MBytes
[ 4] 3.00-4.00 sec 4.92 MBytes 41.3 Mbits/sec 24 2.99 MBytes
[ 4] 4.00-5.00 sec 0.00 Bytes 0.00 bits/sec 27 2.95 MBytes
[ 4] 5.00-6.00 sec 0.00 Bytes 0.00 bits/sec 27 2.92 MBytes
[ 4] 6.00-7.00 sec 0.00 Bytes 0.00 bits/sec 27 2.88 MBytes
[ 4] 7.00-8.00 sec 0.00 Bytes 0.00 bits/sec 27 2.85 MBytes
[ 4] 8.00-9.00 sec 0.00 Bytes 0.00 bits/sec 27 2.81 MBytes
[ 4] 9.00-10.00 sec 0.00 Bytes 0.00 bits/sec 27 652 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 38.5 MBytes 32.3 Mbits/sec 244 sender
[ 4] 0.00-10.00 sec 35.4 MBytes 29.7 Mbits/sec receiver
iperf Done.
But there’s no problem to send data:
$ iperf3 -c 10.200.200.2 -R
Connecting to host 10.200.200.2, port 5201
Reverse mode, remote host 10.200.200.2 is sending
[ 4] local 10.200.200.1 port 43688 connected to 10.200.200.2 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 15.3 MBytes 129 Mbits/sec
[ 4] 1.00-2.00 sec 16.3 MBytes 137 Mbits/sec
[ 4] 2.00-3.00 sec 15.9 MBytes 133 Mbits/sec
[ 4] 3.00-4.00 sec 25.1 MBytes 211 Mbits/sec
[ 4] 4.00-5.00 sec 33.3 MBytes 280 Mbits/sec
[ 4] 5.00-6.01 sec 30.7 MBytes 256 Mbits/sec
[ 4] 6.01-7.00 sec 31.0 MBytes 262 Mbits/sec
[ 4] 7.00-8.00 sec 23.0 MBytes 193 Mbits/sec
[ 4] 8.00-9.00 sec 33.6 MBytes 281 Mbits/sec
[ 4] 9.00-10.00 sec 34.3 MBytes 288 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 262 MBytes 220 Mbits/sec 21 sender
[ 4] 0.00-10.00 sec 260 MBytes 218 Mbits/sec receiver
iperf Done.
Using my 3rd VPS, I can still reproduce the problem, so basically I think this is a problem of DigitalOcean’s droplet.
I guess that maybe some of your DDoS protection system is blocking high-bandwidth UDP, but I’m not sure. Can you help me tracing the problem down?
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