What's limiting my network connection speed to 100mbps?

[alpg]

Hello everyone,
i need your help as i struggle to use the auto backup plans on my NAS WD DX4000.
My LAN port on the motherboard is INTEL 82579V gigabit port.
to my knowledge the cables are CAT5 which should support gigabit.
my cable modem is a cheap one (they only sell this model in my country)

But it says it has "4X RJ-45 Ethernet Port (10/100/1000 Mbps BaseT MDIX)"
My DX4000 is also dual gigabit lan capable. Both cables are pluuged in. i dont use a router, so an ethernet cable comes goes to my MOBO directly and 2 Cables go to my DX4000 Directly from the modem which also is Gigabit capable (at least should be. if it helps the model of my cable modem is CBW 383ZN but i dont think you can find english source for it but you can click the link to google translated to english tech spec document of the manufacturer : https://translate.google.com/translate?sl=tr&tl=en&js=y&prev=_t&hl=tr&ie=UTF-8&u=http%3A%2F%2Fwww.netmaster.com.tr%2Furun%2F68%2Ft&edit-text=

also based on some source the international model number is castlenet cbw3843g4s

Anyway when i go to my Control Panel-Networking-Ethernet Connection and click on my connection i can see the SPeed is limited to 100MBPS, also on Task Manager/Ethernet Connection i can see it is limited to 100MBPS so when i try to send files to my NAS the speed is limited 11MB/s so it takes days to back up my data.


i really have no way to change my cables because they are embedded inside my walls. maybe i can try with a different cable but to try it i ll need to buy 30Meters long networking cable. So is there a way to understand what is limiting my network speed and how to unlimit it.

My wifi is 300MBPS capable so maybe using wifi to transfer files can be a better option but still i want to take advantage of the cables.

i can provide screenshots
any help will be appreciated.

 

[bill001g]

Do not plug both your ethernet cables from your nas into the router. The router would need special features to combine both. You are to a point lucky it is not causing large issues for you.

The device you call a modem is actually a router also.

Take your pc near the router and try one of the cable you know works to the nas. See if the settings in the control panel go to 1g. Of course make sure you have the speed set to auto in the nic settings.

It would not be uncommon for the in wall wires to have issues. Remove the plates on both ends and make sure all 8 wires are connected properly. Wall jacks usually have a color code printed on them make sure the wire colors match. You can also try to pull the wires out cut off a very small amount and then re punch them into the wall jack. It would be extremely unlikely for the wires in the wall itself to develop a failure...maybe a rat eating them but they do not fail because they get old or something.

Pretty much when the cable drop to 100m it means the blue or brown pair in the ethernet cable is having a issue. Other than broken ports in equipment this is almost always a cabling issue

 

[alpg]

Do not plug both your ethernet cables from your nas into the router. The router would need special features to combine both. You are to a point lucky it is not causing large issues for you.

The device you call a modem is actually a router also.

Take your pc near the router and try one of the cable you know works to the nas. See if the settings in the control panel go to 1g. Of course make sure you have the speed set to auto in the nic settings.

It would not be uncommon for the in wall wires to have issues. Remove the plates on both ends and make sure all 8 wires are connected properly. Wall jacks usually have a color code printed on them make sure the wire colors match. You can also try to pull the wires out cut off a very small amount and then re punch them into the wall jack. It would be extremely unlikely for the wires in the wall itself to develop a failure...maybe a rat eating them but they do not fail because they get old or something.

Pretty much when the cable drop to 100m it means the blue or brown pair in the ethernet cable is having a issue. Other than broken ports in equipment this is almost always a cabling issue

thank you for your message.
i unplugged the 2nd cable after your warning.

unfortunately i dont have the chance to move my desktop computer next to the modem (its really too much work, my cables usually go through the wall from the back of the case to the monitor and desk) but i ve got my laptop out and went to connected to the modem/router used the second (now unplugged) cable of the Nas to it and Boom. it was shown as gigabit.

the cable which goes through the wall is done by me there s no socket or jack or anything. its embedded in the wall cement (it was the easiest way to do it and even though i was a little worried to not be able to replace it i ve gone with it anyway)

i think i should get someone to unplug both ends of the cable and punch them. or maybe if its not that hard i can do it if there s a nice guide to it.
thanks again.

 

[bill001g]

Take your laptop and plug it in instead of your desktop. It still could be the cable even if the laptop get 1g, some cables are just barely acceptable and some machine will not connect. Make sure the nic on the desktop is set to auto speed

You could cut the ends off and put new rj45 plugs on but it takes some skill and the tool cost at least $10. The punch down wall jacks are called keystones and are more expensive than just the plastic rj45 plugs and you will need short ethernet patch cables to connect between the new jacks and your equipment. Still the total cost will likely not be more than the tool and the rj45 plugs and the odd of a person with no experience getting the keystones correct is much higher than crimping on rj45. You can try multiple times if mess up the keystone just by pulling the wires out.