Got a tricky internet/LAN issue causing drastic slow down in speeds.

Combat squirrel · 5 Jan 2020 at 12:59

Hi all, so I have an unusual internet setup. My house has an Asus RT-AC87U connected to a BT fibre modem which works great & as expected, getting 68mb down, 18 up always without fail.

In my office which is in another building, I have my Asus RT-AX92U which sees my 87U as its ‘WAN server’ - it is connected via a 1gb lan cable.

The issue is, my 92u connects fine at full speed for several minutes then for no reason I am aware its connection speed to the net drops to 2mb down 1 up…..(or slower)

The only way to stop this is reset both routers, which again works fine for some minutes then speeds drop again.

Settings:

Asus RT-AC87U - default settings- manually assigned IP address of the 92u is 192.168.1.5

87u’s DHCP router setup is 192.168.1.2 - 192.168.1.254

Subnet 255.255.255.0

Asus RT-AX92U - WAN is auto IP (I have tried the 87u’s ip manually of 192.168.1.1 / 255.255.255.0 - both this and auto ip works fine and connects albeit with the above issue, so the data is going through)

92U’s DHCP address range is then 192.168.50.2 - 192.168.50.254

In theory this should work ?? The 92U see’s its wan port for data at 192.168.1.1 then moves this to its own DHCP 192.168.50.2…etc

I want my office and the house devices on there own separate networks.

Any ideas why this frustrating slow down happens?

edscdk · 5 Jan 2020 at 13:05

Probably not the answer you want but I'd just make the 92u a wireless access point

Combat squirrel · 5 Jan 2020 at 13:07

edscdk said:
Probably not the answer you want but I'd just make the 92u a wireless access point

yeah last resort but do want its own network in my office

Hyburnate · 5 Jan 2020 at 13:10

Combat squirrel said:
yeah last resort but do want its own network in my office

Best way for trouble free is to upgrade your router then to a Mikrotik or Ubiquiti which supports VLANs, stick one of the LAN ports VLAN 20 for example and patch your office link in to that and then then put your office "router" as a WAP or buy a cheap Gigabit switch to replace it with.

Use your current 87U as a WAP for the main network.

Combat squirrel · 5 Jan 2020 at 13:15

Interesting just put the 92u in AP mode and its still slow........odd, perhaps the connection between them then ?

Hyburnate · 5 Jan 2020 at 15:15

Combat squirrel said:
Interesting just put the 92u in AP mode and its still slow........odd, perhaps the connection between them then ?

Potentially, is it crimped?

Avalon · 5 Jan 2020 at 15:50

What exactly is the cable? External grade, solid core and shielded buried 6"+ or run in conduit presumably? Ignoring the horrors of double NAT, unplug the cable at both ends, start with two pc's and iperf, this will prove/disprove the cable quickly and easily.

Combat squirrel · 6 Jan 2020 at 12:22

Got it figured eventually it was the cable as it was running through some 1gb power line adaptors, moving the plug to the adjacent one fixed it!

Avalon · 6 Jan 2020 at 14:59

Combat squirrel said:
Got it figured eventually it was the cable as it was running through some 1gb power line adaptors, moving the plug to the adjacent one fixed it!

So it wasn’t the cable, it was the crappy powerline adapters that’s you neglected to mention in the first post. Also as building regs require the building to have its own power board/circuits and local isolation, either you ignored pretty much every rule you had to follow, or those are some pretty amazing powerline adapters that can jump a circuit and maintain gigabit.

Wizzkidy · 6 Jan 2020 at 15:05

I have my Asus RT-AX92U which sees my 87U as its ‘WAN server’ - it is connected via a 1gb lan cable.

Its not connected by a 1Gbit LAN cable though is it as your first post mentioned. Power line adapters will not get 1Gbit speeds 99% of the time, I highly doubt moving this to an adjacent socket would have made much difference at all! Something doesn't add up here

Combat squirrel · 6 Jan 2020 at 15:17

Avalon said:
So it wasn’t the cable, it was the crappy powerline adapters that’s you neglected to mention in the first post. Also as building regs require the building to have its own power board/circuits and local isolation, either you ignored pretty much every rule you had to follow, or those are some pretty amazing powerline adapters that can jump a circuit and maintain gigabit.

Blimey lad !!! someone having a bad day? someone got your goat? or is it your just completely making **** up in your head to suit your own rant without any factual information WHAT SO EVER - its ok, I forgive you, the entirety of modern human civilisation is running on idiot mode right now and ignoring facts, and not even seeking them, and then creating massive fiction from nearly zero info.

Right, now iv given as good as iv got....

The setup is actually a LAN cable into the office building from the main house, of course its a separate electrical circuit :rolleyes:

the room the LAN goes into is the spare room NEXT to the office room - its not suitable to run a cable through the wall at the moment so it goes into a 1GB Power lan plug, and travels 15 feet to next rooms power plug and shock horror, works, well, it did until slow down, I reset the plug and now its fine 2 days later, no idea why.

Wizzkidy said:
Its not connected by a 1Gbit LAN cable though is it as your first post mentioned. Power line adapters will not get 1Gbit speeds 99% of the time, I highly doubt moving this to an adjacent socket would have made much difference at all! Something doesn't add up here

I don't want 1gb's speeds - the ONLY REASON there is a LAN cable from the house is - internet connection - with which fibre runs at 68mb//18mb AT BEST - a 100mb LAN connection would be plenty to fulfil that speed, there is no data going to and from the house other than the net.

INTERNALLY in the office yes, everything is on 1gb & AX Wifi, so my internal file transfers to my server etc run just dandy, its simply the net that was clocked down.

So again the internet speed was the only thing tanking, internally in office building the network is blazing fast, well, plenty fast for me, the only reason I have a lan cable to the house is to have an internet connection.

Thanks for all your help people, maybe hold off on ultimate judgement with a lack of facts next time eh

Avalon · 6 Jan 2020 at 17:19

Combat squirrel said:
Blimey lad !!! someone having a bad day? someone got your goat? or is it your just completely making **** up in your head to suit your own rant without any factual information WHAT SO EVER - its ok, I forgive you, the entirety of modern human civilisation is running on idiot mode right now and ignoring facts, and not even seeking them, and then creating massive fiction from nearly zero info.

Right, now iv given as good as iv got....

The setup is actually a LAN cable into the office building from the main house, of course its a separate electrical circuit the room the LAN goes into is the spare room NEXT to the office room - its not suitable to run a cable through the wall at the moment so it goes into a 1GB Power lan plug, and travels 15 feet to next rooms power plug and shock horror, works, well, it did until slow down, I reset the plug and now its fine 2 days later, no idea why.

I don't want 1gb's speeds - the ONLY REASON there is a LAN cable from the house is - internet connection - with which fibre runs at 68mb//18mb AT BEST - a 100mb LAN connection would be plenty to fulfil that speed, there is no data going to and from the house other than the net.

INTERNALLY in the office yes, everything is on 1gb & AX Wifi, so my internal file transfers to my server etc run just dandy, its simply the net that was clocked down.

So again the internet speed was the only thing tanking, internally in office building the network is blazing fast, well, plenty fast for me, the only reason I have a lan cable to the house is to have an internet connection.

Thanks for all your help people, maybe hold off on ultimate judgement with a lack of facts next time eh

It's cute that you you get so upset that people jump to conclusions, but the reality is the only reason anyone concluded anything was based on the details you provided and more importantly the ones you failed to provide in your opening and subsequent posts. Perhaps you should consider who needs re-evaluate how they post? As to your mini tirade, I get that it hurts when you realise you did something monumentally stupid, but unless you've decided to identify as a power line adapter and took offence to me calling your assumed non binary identity 'crappy' then the only other thing I did was point out you have neglected to tell anyone about the variables which were involved and based on the information you'd provided ignored building regs. Low and behold, now you've posted information that suggests you forgot to mention something that would change that in your OP... who would have thought it?

Still, at least you muddled through, I suppose we can all be grateful for that

the-evaluator · 6 Jan 2020 at 18:20

Wizzkidy said:
Power line adapters will not get 1Gbit speeds 99% of the time

Try 100% of the time. There's absolutely no way a powerline adapter will give 1Gbps. No chance. It may well have a 1Gbps ethernet port on each end so whatever device the adapter is connected to will report a 1Gbps link but no way will a powerline be able to push 1Gbps through it.

the-evaluator · 6 Jan 2020 at 18:23

Avalon said:
those are some pretty amazing powerline adapters that can jump a circuit and maintain gigabit.

It's not uncommon for powerline adapters to work across circuits. In my previous house I had powerlines connected across 2 different ring final circuits and they worked about as well as you coudl expect. Not amazing but it did the job until I ran ethernet. At my current house until recently I had powerline adapters setup with one end on a ring final circuit and the other on a radial with both MCB's being on a different RCD. Again, it worked about as well as you'd expect but it did work and it was fast enough that the usable link over the powerline was faster than my internet connection.

Combat squirrel · 6 Jan 2020 at 19:16

No idea how fast these adaptors run - but im not sending my local network traffic around them so I don't need to worry - they are however transferring data fast enough to the absolute max speed of the net connection anyway and I get about a 20ms ping which isn't bad considering its modem, --> router --> long lan cable --> power adapter in ---->power adapter out ---> router on its own IP -----> phone/mac lol

Avalon · 6 Jan 2020 at 20:26

the-evaluator said:
It's not uncommon for powerline adapters to work across circuits. In my previous house I had powerlines connected across 2 different ring final circuits and they worked about as well as you coudl expect. Not amazing but it did the job until I ran ethernet. At my current house until recently I had powerline adapters setup with one end on a ring final circuit and the other on a radial with both MCB's being on a different RCD. Again, it worked about as well as you'd expect but it did work and it was fast enough that the usable link over the powerline was faster than my internet connection.

The critical bit in what you quoted isn't that they work across circuits, that's well documented - in the early days it wasn't uncommon to find people picking up neighbours power line kit in some circumstances due to unimplemented encryption and/or default keys being used - the critical bit was maintaining gigabit, that's not happening.

jaybee · 7 Jan 2020 at 01:41

I think all he was saying above is that if you had simply included that you were using powerline adapters from the off (fairly important to include in a network related issue) then advice probably would have straight away been to check throughput with them. Instead you said the routers were connected via gigabit cable. Well, they aren't are they.

the-evaluator · 7 Jan 2020 at 07:09

Avalon said:
The critical bit in what you quoted isn't that they work across circuits, that's well documented - in the early days it wasn't uncommon to find people picking up neighbours power line kit in some circumstances due to unimplemented encryption and/or default keys being used - the critical bit was maintaining gigabit, that's not happening.

Agreed, gigabit isn't happening but I'd already mentioned that in my previous post so didn't see the need to go over it again.

Deleted member 77746 · 7 Jan 2020 at 09:42

Combat squirrel said:
I want my office and the house devices on there own separate networks.

You have gone about it the wrong way anyway. Your setup isn't the way in real world how it should work.

Combat squirrel · 7 Jan 2020 at 10:20

mrbell1984 said:
You have gone about it the wrong way anyway. Your setup isn't the way in real world how it should work.

How have I gone about it the wrong way? It works fine now....the devices run on there own separate sets of IP address ranges as intended.....the internal transfer speeds between office mac and server run at the maximum speed of 1gb / sec (that always worked anyway as they are connected with lan cables).....and the Internet now works at the speed it should.

Works to spec, so I don't understand why you think that's wrong somehow.