Hoping somebody here might be able to give me some advice or a solution.

The ISP is Unlimited Internet on Enable Fibre 100/20 plan. I'm not sure on the exact timeframe, but was maybe up to 6 months ago we began to have speed issues on our connection at my work. At the time we thought it could have been a faulty router as it was positioned in a laundry area in the house that didn't have the best ventilation when the dryer was running. We ended up moving the router out to garage where a home business is run from and where the majority of the networking equipment is located. That made no difference to the speed issue. The ONT is still located in the laundry area as it can’t easily be moved.

The issue we are having was with a Huawei HG659b, a Vodafone model with the B26 firmware installed. Were no issues up to that point with internet traffic. Basically a lot of the internet traffic is slow, things that normally would load instantly or download at near full speed were crawling along at speeds of 40KBps. The really weird thing we discovered later on was if we run a speedtest on speedtest.net to particular servers such as stuff fibre and 2degrees in Auckland we would get the normal 115 down and 24 up. Run a speedtest to anything else, including Unlimited Internet’s parent company HD.net and we would only get a maximum of 15Mbps down, and normal upload speeds.

We ended up changing to a Mikrotik router we had in the workshop, that too had the same speed issue, however I think at that stage when we ran a TP-Link TD-W9980 it was fine, but I can’t remember for certain. We ended up going back to the Huawei later and from memory that was fine again. However it didn’t last long and started having the speed issue again and has never run properly since then.

I ended up taking the Huawei router home to test it as I am also with Unlimited Internet, and sure enough it was slow at my place so we were thinking it was a faulty router. I run a TP-Link TD-W9980, about a week later my connection started having the same issue, however it did come right by itself at some stage. I can’t remember the exact timeframes. My home connection has had no issues since then.

However at work, since then we have tested multiple routers, including a Mikrotik hAP mini, my laptop setup with a PPPoE connection directly connected to the ONT, a D-Link DSL-2280AL and just today we purchased a new TP-Link Archer A6. The Mikrotik, my laptop and the TP-Link all have the same speed issue as the Huawei, however we have been running the D-Link for about a month or so without issue for the internet speeds. We decided today to purchase the TP-Link due to issues with the IPv6 configuration on the D-Link, and on setup I noticed the speed issues were occurring on it. I have taken it to my house Tonight and the speed issue is present here too. We’ve re-connected the D-Link at work, and it is normal (although I had trouble getting it to connect to the PPPoE), and my house the TD-W9980 is performing normally when re-connected. My laptop seemed to had come right speed wise but it was performing exactly the same as the other routers quite often.

A weird thing we did notice with the D-Link was an AP inside the house was performing slowly with the same speedtest results, we ended up turning flow control off on our main 24 port switch and it fixed that issue. No other device on the internal network was experiencing speed issues to the internet on the D-Link however.

We have tried isolating the network, and the fact that I get the same speed issues with those routers at my house tells me it is not the internal network at work causing the issue. Testing on both wired and Wifi we get the same results.

Anybody got any ideas? We are puzzled, Unlimited don’t know what is going on, we’ve spoken with Enable as well and they couldn’t see any faulting on their end. If anybody has any suggestions I would appreciate it. Only thing we can think of is perhaps changing ISP, our only worry is it is a problem on Enables Network and the new ISP would have the same issue.

One thing we haven't done is test those routers on a non Unlimited Internet Enable Fibre line. We are hoping to do that in the next few days.