January 28, 201115 yr Hi I just realized that my network has switched to 10mbit since my last reboot. Before this i had a stable 1000mbit link. i tried this: ethtool -s eth0 speed 1000 duplex full but it did not help. This is my Ethernet info: NIC info (from ethtool) Settings for eth0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Advertised auto-negotiation: Yes Speed: 10Mb/s Duplex: Full Port: MII PHYAD: 0 Transceiver: internal Auto-negotiation: on Supports Wake-on: pumbg Wake-on: g Current message level: 0x00000033 (51) Link detected: yes NIC driver info (from ethtool -i) driver: r8169 version: 2.3LK-NAPI firmware-version: bus-info: 0000:03:00.0 Ethernet config info (from ifconfig) eth0 Link encap:Ethernet HWaddr 00:11:11:76:83:e4 inet addr:192.168.2.65 Bcast:192.168.2.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:4524 errors:0 dropped:0 overruns:0 frame:0 TX packets:4551 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2915356 (2.7 MiB) TX bytes:1946648 (1.8 MiB) Interrupt:27 does anybody know what happened? syslog-2011-01-28.txt
January 28, 201115 yr Yes, your LAN negotiated a 10Mb/s rate since it was unable to handle anything higher. (Translation: You have a bad/loose cable, or a bad/defective router, or a bad/defective switch, or a bad/defective NIC chipset, or induced noise on the LAN) That should narrow it down for you.
January 28, 201115 yr Author ok... i changed the cable... no difference then i plugged the server into a different switch/router... still no difference. so i assume i have a problem with my MB?!?
January 28, 201115 yr Users have often had to add a gigabit card to handle the networking. No need to replace the motherboard. If you add a network card, you do need to disable the onboard networking in the BIOS settings.
January 29, 201115 yr "... i changed the cable... no difference then i plugged the server into a different switch/router... still no difference. " ==> Did you do this (change the cable; change the connection to a different router) for BOTH the server and the computer you're accessing it with? If EITHER of these has a network issue, the speed between them will be reduced. Since you have a spare router, try this: Connect JUST the server and a PC to the spare router -- nothing else (no internet; no other PCs; etc.) and then see what speed you get (Note that if it's not a gigabit router your speed will only be 100Mb ... but that will at least let you know that it's working okay). Once you've isolated WHERE in the network the issue is, you can replace the defective component. From my experience, the most likely culprit is either a cable or a bad port on a switch -- but everything Joe L listed is possible.
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