APU4 - OpenVPN - Traffic above 50 M/Bit heavy paket loss
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Hi,
I´m running an APU4 with OpenVPN (AMD GX-412TC SOC CPU)
Specific traffic is routed through the VPN tunnel (by device) especially to avoid geo-blockingI know that the CPU isn´t the most performant, but I´m encountering a really weired issue.
As long as I have no load on the VPN, everything looks good.
When I start downloading anything with around 5 MB / sec i start facing a packet loss (see screenshot 3%)
If I increase the download speed from 5 mb/sec to 10 mb/sec, I face a paket loss of arround 20% until the VPN tunnel goes offline.
VPN is set up with UDP in IPv4, AES-256-GCM
Following custom options:
tls-client;
remote-random;
tun-mtu 1492;
tun-mtu-extra 32;
mssfix 1448;
persist-key;
persist-tun;
reneg-sec 0;
remote-cert-tls server;load average is obiosly pretty high around 1.5 or higher. Openvpn is using a lot of CPU. That is clear.
Question: Anything I can do avoiding the packet loss? It is a pain that the VPN tunnel goes off and on.
Only thing that came to my mind is a traffic limiter - but this sounds weird to me :) -
I had the same issue with OpenVPN (pfSense 2.4.5-RELEASE-p1) and AMD GX-420CA SoC CPU.
Downloading anything with speed higher than 200 Mb/s causes packet loss of over 20% until VPN_WAN Gateway goes offline.
The best solution I've found is to use Traffic Shaper (not Limiter)
I follow this guide and put 200 Mb/s as my download speed in step 6
After that, packet loss stops at 3-5% when downloading with maximum speed of 200 Mb/s