Flint 3 wan speed capped at 100mbps

Router
1

Hi everyone,

I am new to flint and custom routers, and no knowledge with commands and such. So I would appreciate any help, thanks.

A bit of background info, I live in Sydney and running a new flint 3 I bought for fttp nbn on the Optus 500down/40up plan, it is one of those 4 port ntds.

Currently the router seems to be capped at “100mbps full duplex” for the wan shown in the port management tab for whatever reason. I have tried a couple things already from forums I have read, but nothing seems to hit. The things I have tried so far:

  • Tried connecting wan via lan 1 in wan mode
  • Changed ethernet cables(cat6 and cat6e, according to amazon, of which I individually checked between my pc and router to check they support the full 2.5gbps via windows settings)
  • Rebooted it
  • A new 0.5m shielded cat8 cable from ugreen (which I have now found out isn’t really useful)
  • Lowering MTU size (read from another forum post, but not sure if this matters as Optus uses DHCP)
  • Directly connected my pc to the ntd, but even that seems to be limited to 100mbps (it’s a 2.5gbps adapter)
  • Loaded up speedtest.net via ssh on the router, but same result capped at 100mbps(I have no idea what I was doing, am I supposed to delete it afterwards)

One thing to note though, some of the cat6 cables I tried before, lowers the negotiated speed to 10mbps full duplex, even though they still support the 2.5gbps according to windows. I am totally at a lost for what to do, I don’t have an original optus modem either. Right now, I am thinking of trying a cheap gigabit switch to go inbetween the router and ntd, as I am assuming it is the router config causing the issue, or, potentially try a free trial on another nbn plan on the ntd’s port 2. This has been painfully annoying, so I would appreciate any resources I could look into.

Cheers

2

If directly connecting your pc to ntd also gives 100mbps then the flint3 is completely out of the picture. Also it seems like that specific port on the ntd is only 100mbps or is damaged. Can you check it out?

3

Sometimes i have the same issue. Around every 4 weeks the WAN port switch from 1Gbit to 100mbit. First i thought it’s the cable or the port from the other switch. But when i reboot Flint3 everything is fine. I don’t found some infos in the logs when the port switch to 100mbit maybe its deleted so implemented a rotating log and keeping the logs from everyday for 6 weeks.

4

Sorry for the late reply,

I have since figured out that it was probably the UNI-D port that was the issue, or something on optus’ side limiting speeds to 100Mbps. I had Launtel’s free trial on UNI-D2 and that worked with no problems at all. Seems like it should’ve just been a plug and play thing, I will probably be changing service providers afterwards.

Thanks guys, your answers were helpful in sorting this bit out.

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