network card link speed unstable

hello all.
i use wired network connected via homeplug ( electric grid adapter ).
the problem : network link speed is limited to 10 mbps often, sometimes a restart solves the problem and the link speed rise to 100 mbps but more often then not it doesnt
solve the problem. the homeplug leds indicates that the link speed is => 105 mbps allways.

troubleshooting i tried : got a new cable,didnt solve the problem.
reset the homeplugs and updated firmware ,still the same.
dualbooted windows, link is allways 100 mbps stable.
the home plugs are each connected to the wall without a splitter.

this problem is since i switched to opensuse 12.3. i didnt have the problem of no network after installation.

opensuse 12.3 64 bit on thinkpad t61 with 1gb ethernet onboard.

any ideas as to what can be the problem ?

nobody have an idea where to start ?
ive been looking online for troubleshooting info and couldent find something meaningful
maybe this is not the right forum topic ?
ill leave it open for a few days while looking for a solution…
if anybody have any idea on where to start i will be greatful.

Be patient. Others who may be able to assist may not be online, or had time to read this post yet.

the problem : network link speed is limited to 10 mbps often, sometimes a restart solves the problem and the link speed rise to 100 mbps but more often then not it doesnt
solve the problem. the homeplug leds indicates that the link speed is => 105 mbps allways.

A likely negotiation issue… what is reported by the following?

/usr/sbin/ethtool eth0

*assuming eth0 is your interface in question

thanx deano,
the output is :
Settings for eth0:
Supported ports: TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: off (auto)
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes

That output looks okay, but perhaps auto-negotiation is causing the issue sometimes. It can be hard set to 100M FD if necessary. Other than that, I can’t really offer any further advice with these devices.

thanx
i will try to set it
if it wont work i will report
:good:

thank you deano for the pointer…
after trying to set autonegotiation from the computer side i discovered the problem was on router side.
something withe its firmware was wrong.
took some time to narrow it down though.

Glad you’ve tracked it down. Well done.