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?
This textbox defaults to using Markdown to format your answer.
You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!
Heya,
Just came across this answer and decided to write some general guidelines for anyone who comes across this in the future despite the old question.
It’s possible that your issue is related to DDoS protection, network configuration, or some other factors affecting the network performance when using WireGuard. To rule out any DigitalOcean-specific issue, you can try testing without WireGuard to see if the issue persists.
If you still experience the problem, I recommend opening a support ticket with DigitalOcean and providing the details of your setup and tests. Our support team will be happy to help narrow down the issue and guide you towards a resolution. To open a support ticket, please visit the DigitalOcean support page.
Additionally, you may find the DigitalOcean Droplet limits documentation helpful for understanding bandwidth on DigitalOcean Droplets.
Hope that this helps!
Become a contributor for community
Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.
DigitalOcean Documentation
Full documentation for every DigitalOcean product.
Resources for startups and SMBs
The Wave has everything you need to know about building a business, from raising funding to marketing your product.
The developer cloud
Scale up as you grow — whether you're running one virtual machine or ten thousand.
Get started for free
Sign up and get $200 in credit for your first 60 days with DigitalOcean.*
*This promotional offer applies to new accounts only.