Running a VPN on one of my clients makes the ER707-M2 CPU spike to 100%
This behaviour has never occured before, but it's also been a while since I've used a VPN on one of my clients.
Whenever I'm running Proton VPN on my Linux computer, my ER707-M2 router's CPU spikes to 100%, causing slowness throughout my entire network (speed tests on other devices barely making it past 30Mbps despite being on a 1Gbps connection). Doesn't matter if I use UDP, TCP or WireGuard. I have yet to test if this also happens on a Windows computer.
Controller version is 5.14.26.1.
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Disabling deep packet inspection resolves the issue. But DPI has always been enabled on my controller and I never had this problem.
I'll see if I can get a Wireshark trace going. The network is completely loop-free, no changes have been made in the topology recently.
Or maybe the VPN's not at fault per se. It could also be that Peer to Peer traffic (like Bittorrent) is creating a huge strain on the DPI. I will do some further testing.
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Hi @Matva
Thanks for posting in our business forum.
Matva wrote
Disabling deep packet inspection resolves the issue. But DPI has always been enabled on my controller and I never had this problem.
I'll see if I can get a Wireshark trace going. The network is completely loop-free, no changes have been made in the topology recently.
Or maybe the VPN's not at fault per se. It could also be that Peer to Peer traffic (like Bittorrent) is creating a huge strain on the DPI. I will do some further testing.
DPI.. No wonder.
DPI will examine every packet from the local network. You use a VPN and create much work to do with the CPU. That spikes the CPU.
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Hi @Matva
Thanks for posting in our business forum.
Have you Wireshark to monitor if there is any re-transmission on the LINUX?
Suspect this might be a problem with the VPN. No clear sign indicates that this is a fault on the router yet. But this is a clear sign that your network experienced the re-transmission and seems to have a loop. This is also a clear symptom of the loop.
I would expect to learn more about your network diagram, configs on the router, and the monitor results.
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Disabling deep packet inspection resolves the issue. But DPI has always been enabled on my controller and I never had this problem.
I'll see if I can get a Wireshark trace going. The network is completely loop-free, no changes have been made in the topology recently.
Or maybe the VPN's not at fault per se. It could also be that Peer to Peer traffic (like Bittorrent) is creating a huge strain on the DPI. I will do some further testing.
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Hi @Matva
Thanks for posting in our business forum.
Matva wrote
Disabling deep packet inspection resolves the issue. But DPI has always been enabled on my controller and I never had this problem.
I'll see if I can get a Wireshark trace going. The network is completely loop-free, no changes have been made in the topology recently.
Or maybe the VPN's not at fault per se. It could also be that Peer to Peer traffic (like Bittorrent) is creating a huge strain on the DPI. I will do some further testing.
DPI.. No wonder.
DPI will examine every packet from the local network. You use a VPN and create much work to do with the CPU. That spikes the CPU.
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