We have a client who was not getting the full 400Mbps speed from their internet connection. Upon investigation, we found their Unifi Secure Gateway was auto-negotiating the WAN connection to the ISP router @ 100Mbps.
We put this down to a poor cable so attended the site to replace the cable.
I initially tested the ISP's router with just a short pre-made cable and whilst I wasnt getting the advertised 400Mbps we were getting 200+ Mbps.
So I made a 30-metre cable round to where our USG was and before connecting to our USG I tested with just my laptop to ensure I was still getting the 200+ Mbps. Nope, it was hard capped @ 94Mbps.
Went back to the ISP router with the pre-made and tested and sure enough, 200Mbps again.
Thinking it could be the quality of cable I was using I made a shorter 2m length of cable and tested just into the ISP router and again 200Mbps
Ok now that's weird
So I then thought the length of the cable, or something I have run it next to is causing issues, so I pulled the cable back, laid it across the floor and chopped about 10m off it, tested and again hard-capped @ 90Mbps.
Any thoughts as to what could explain this?
Just to rule them out:
- I tested on 3 different speed testing sites each time and all showed the same results
- It was the same port on the ISP router each time
- The ISP router is a high-quality Cisco router
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