NIC operating at 100MB not 1GB

R

runningconfig

n00b
Joined
Jul 10, 2011
Messages
46
Helllllo,

Having some issues with the NIC on my laptop. Last night I noticed my transfer speeds were significantly slower than usual, when I checked the NIC speed it was set at 100MB.

Laptop - Dell Inspiron 15R SE 7520 - Windows 7 x64
NIC - Realtek RTL8105E-V

Troubleshooting steps thus far:
- different cable
- different switch
- removed/updated driver (from Dell and directly from Realtek)
- statically set NIC with 1GB Full-Duplex
- flash BIOS

Anyone have any ideas?
 
Maybe the nic card itself is going out. I had this same issue last week. Switched the cable out with cat 7. It's all good now.
 
Different OS like Linux live CD, or Bart's PE to eliminate current installation?
 
The Linux Live is one of the better options assuming the hardware has been physically checked out good. If the driver stack for the NIC got screwed up somehow, that can easily cause issues. On the server side, we see it quite frequently.
 
eh... still 100MB using live Ubuntu.. :/

Code: 
ubuntu@ubuntu:~$ sudo ethtool eth0
Settings for eth0:
	Supported ports: [ TP MII ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Half 1000baseT/Full 
	Supported pause frame use: No
	Supports auto-negotiation: Yes
	Advertised link modes:  10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	Advertised pause frame use: Symmetric Receive-only
	Advertised auto-negotiation: Yes
	Link partner advertised link modes:  10baseT/Half 10baseT/Full 
	                                     100baseT/Half 100baseT/Full 
	Link partner advertised pause frame use: Symmetric Receive-only
	Link partner advertised auto-negotiation: Yes
	Speed: 100Mb/s
	Duplex: Full
	Port: MII
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: on
	Supports Wake-on: pumbg
	Wake-on: g
	Current message level: 0x00000033 (51)
			       drv probe ifdown ifup
	Link detected: yes
 
okay.. so I tried plugging in another host to that port and it was running at 100MB.

I then noticed that the other computer on that switch was running at 100MB (based on link light) and after replacing that cable it came up at 1GB. I then plugged my laptop back in using the same cable I was using previously and it's now running at 1GB.

Not sure what happen here.
 
runningconfig said:
okay.. so I tried plugging in another host to that port and it was running at 100MB.

I then noticed that the other computer on that switch was running at 100MB (based on link light) and after replacing that cable it came up at 1GB. I then plugged my laptop back in using the same cable I was using previously and it's now running at 1GB.

Not sure what happen here.
Click to expand...

What kind of "switch" were they plugged into? Perhaps it was a small Ethernet hub and not a real switch? With a hub everything has to run at the same speed and will get negotiated down to the speed of the slowest link that gets plugged in.
 
HUB :confused:.

If it was a hub I'm sure I would have been complaining about slow speeds way before this.

It's just a cheap $25 Airlink 8-Port 1GB switch, which is probably why I had issues in the first place. :cool:
 
Some "Green" switches are known for forcing all ports to operate at the lowest connected speed.
 
You must log in or register to reply here.
Back
Top