Slow wifi for internal resources but fast on internet with Deco E4
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Hi
I have this strange issue with my wifi. If I access my local NAS from wifi either with SMB or FTP I get slow speed (it varies between 10 Mbit/s to 25 Mbit/s). However if i download from internet (HTTP, HTTPS, FTP) I get speed around 80-90 Mbit/s from the same laptop sitting at the same place and testing right after the internal test. Speedtest.net shows 94,36 down and 94,80 up.
The NAS is cabled on a gigabit switch. If I connect my laptop with cable directly to the gigabit switch I get speeds around 900 Mbit/s when downloading from the NAS so both the laptop and NAS are performing fine.
If I connect my laptop to the main Deco with cable I get 85-90 Mbit/s when downloading from my NAS. I am aware that the Deco E4 is capped at 100 Mbit/s on the ethernet port so that is good speed.
I don't understand why accessing my NAS is so slow on wifi when accessing internet is much faster. I expect that I can access my internal NAS with the same speed as accessing internet. I have even tested with the same protocol (FTP).
Hope I can get some help here to solve my issue.
Thank you
Kenn
Thank you for your reply.
I made a simple hand drawing of the network
The switch is a 3COM Gigabit Switch 5 - Model 3CGSU05
You ask whether I have tested the wireless speed from the Deco. I have done a test with Speedtest.net from my laptop wirelessly if that is what you mean. That gave me almost 100 Mbit/s so that is good.
I access the NAS local IP. I haven't opened for access externally.
I have also tried to remove the switch so both the main Deco and the NAS and wired computer is connected directly to the Linksys router, That makes no difference, still bad performance on the internal network. On the laptop I tried to copy a big file from the wired computer. It also performed bad so it is not only the NAS but seems to be internal traffic in general.
Last thing I tried was to attach the NAS directly to the second LAN port of the main Deco. Now I can copy from the NAS with full speed (almost 100 Mbit/s) from my wireless laptop. I find that very strange. As if the Deco doesn't like the switch. But it is also not working well when I use the Linksys router as a switch. On the other hand when connecting through the 3COM switch internet speed is fine and that also passes through the switch to get to the router. That makes no sense to me.
Both Deco's as well as the Linksys Router and NAS are on latest firmware. The switch is unmanaged so I don't think that can be firmware updated.
I found another forum topic from another user with a similar issue. He has a Deco M5 but besides that the issue is the same. https://community.tp-link.com/en/home/forum/topic/207514
Again thank you for your help, hope we can solve this.
Kenn