1gbit Internet WAN and routers ER605 and ER7206

Hi everyone,
I got a new fast internet from down 1000mbit /up 300mbit.
And my question is, I did some tests and it seems to me that the ER605 fluctuates a lot when it comes to speed measurement, so when measuring it shows me about 950mbit and then it drops somewhere to 800-700-650.. and after a while it rises again and drops again..
When I measure the line directly on the WAN port without a router, the internet speed is stable 940-890, 920 mbit.
So I think that the ER-7206 v1 model could help solve this problem. I have it hidden at home as a backup.
I also use WireGuard VPN.
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Thank you for your post. From your tests we can see the line itself is solid at ~940 Mbps, so the fluctuation you observe when the ER605 is in-line is almost certainly caused by the router. The most common culprits are an older firmware build, or CPU spikes produced by QoS, traffic statistics, IPS or logging. Please:
1. Upgrade to the latest firmware.
2. Disable QoS, bandwidth control, IPS and any logging you don’t need.
3. Re-run the test with a multi-thread tool (speedtest-cli or iperf3) to rule out browser artefacts.
4. Check Status → CPU/Memory while testing; if utilisation stays above 90 %, the hardware is the bottleneck.
After these steps you should see a stable 920–940 Mbps; if not, the ER605’s NAT throughput is simply topping out and a higher-spec model (ER7206) would be required to guarantee full gigabit.
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Thank you for your post. From your tests we can see the line itself is solid at ~940 Mbps, so the fluctuation you observe when the ER605 is in-line is almost certainly caused by the router. The most common culprits are an older firmware build, or CPU spikes produced by QoS, traffic statistics, IPS or logging. Please:
1. Upgrade to the latest firmware.
2. Disable QoS, bandwidth control, IPS and any logging you don’t need.
3. Re-run the test with a multi-thread tool (speedtest-cli or iperf3) to rule out browser artefacts.
4. Check Status → CPU/Memory while testing; if utilisation stays above 90 %, the hardware is the bottleneck.
After these steps you should see a stable 920–940 Mbps; if not, the ER605’s NAT throughput is simply topping out and a higher-spec model (ER7206) would be required to guarantee full gigabit.
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Good morning,
thanks for your answer. You were right that it is caused by the ER605 router. This model is super small and compact.
1) I have QOS and bandwidth control, IPS and any logging turned off.
I have the latest FW. I don't know off the top of my head.
BUT, I changed it to the ER-7206 version v1 while it was running. And the internet speed is stable as it should be. So approximately ~940 Mbps. So it was caused by a weak router.
Chat GPT told me that there is a difference in performance between these models regarding Wireguard
| Model | WireGuard VPN performance |
| ------------ | -------------------------------- |
| ER707-M2 | \~ 343 Mbps
| ER7406 | \~ 341.3 Mbps
| ER7206 | \~ 177.2 Mbps
But the question is, if that's really the case, Wireguard only reaches about 177mbit on the 7206 router. So then it's worth considering whether to buy the ER7406 or ER707-M2 model. They are identically priced. So I'm thinking about it.
So how is it please?
Thank you
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For the ER7206 V2, the WireGuard VPN throughput is 341.3 Mbps; you can find this figure in the official Spec or Datasheet on our website.
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Thank you, I forgot to add that I have version 1.0 of the ER7206 model.
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