rt-ac68u wan speed limit randomly drops

[ggzzz]

I have a 300Mbps down / 100Mbps up connection and my dl speed randomly drops to 100Mbps. I checked my router admin page and it looks like my router WAN speed limit keeps dropping randomly from 1Gbps to 100Mbps. Router reboot seems to fix the issue temporarily, as you can see in the attached screenshot my current WAN speed limit is 1Gbps.. I am 100% sure it's not an issue with my ISP as wired connections straight from the modem to other machines have no trouble maintaining max speeds.

Please help.

 

[JDB]

Auto negotiation on Ethernet is often funny on many devices.
Try another cable, sometimes it fixes it, simple as it sounds.
Or force it to 1000baseT on either end (assumes you are happy to fiddle under the hood and have the ability to it on the modem at all).


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[ggzzz]

Auto negotiation on Ethernet is often funny on many devices.
Try another cable, sometimes it fixes it, simple as it sounds.
Or force it to 1000baseT on either end (assumes you are happy to fiddle under the hood and have the ability to it on the modem at all).


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thanks for the reply. i will try another cable and see if it fixes the issue permanently.

i'd love to "force it to 1000baseT" but have no idea how to do that and a quick google search didn't return any useful guides unfortunately. my modem is a huawei hg8245h if that matters.

 

[ggzzz]

are you able to confirm that it is not actually an issue with the router itself, because i am willing to shell out money for something better that won't have this problem (like maybe the ac86u?)

 

[JDB]

Given the symptoms I’d say it’s almost certainly dropping to 100baseT. The 68u is a decent bit of kit so don’t think it’ll randomly be doing this due to some hardware issue/limitation


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[ggzzz]

Given the symptoms I’d say it’s almost certainly dropping to 100baseT. The 68u is a decent bit of kit so don’t think it’ll

randomly be doing this due to some hardware issue/limitation


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thanks.

would reducing the number of cables plugged into the modem (all 4 ports are currently in use) help eliminate the chances of it dropping? i don't have any idea on what could be triggering the drop to 100baseT... is there a way to set "port priority" or something like that so the max speed of the connection between my modem and router will stay 1Gbit all the time?

again thanks for responding.

 

[JDB]

I would say on the router it would be worth switching to Merlin’s firmware as then it’s super easy to have a script do the setting change for you, something similar to this
https://blog.kamens.us/2014/11/30/howto-set-the-link-speed-duplex-of-a-port-on-an-asus-router/

On the modem, just log into it and have a look around. I suspect you might end up having to go into the telnet interface on the modem to do it. By before you try that forcing it on the router side might be enough.

Of course it might just be the cable yet!


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[ApexRon]

At this point I don’t believe you have an ASUS router issue. You have received some great advice from previous replies. Auto-negotiation can be an issue but it would be a continuous problem unless there is a cable issue which would make it random. I looked at huawei hg8245h information, what a great product, on paper at least, but too much technology information for me to give any suggestions.

Realize that some ISP will throttle throughput speed, not modem speed, to prevent bandwidth hogs from impacting the internet experience of others. They will also do this during peak traffic hours.

 

[JDB]

FWIW very similar situation https://www.snbforums.com/threads/wan-drops-from-1000-to-100.36640/


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