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Ethernet Adapter Problems

asked 2014-08-06 22:18:02 -0600

cgonz31 gravatar image

updated 2014-08-11 22:18:32 -0600

I am running Fedora 20 (64-bit) with kernel 3.15.7-200.fc20.x86_64. The ethernet adapter is a Qualcomm Atheros AR8162. The output of ifconfig is:

em1: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet6 fe80::28c:faff:fe65:57c5  prefixlen 64  scopeid 0x20<link>
        ether 00:8c:fa:65:57:c5  txqueuelen 1000  (Ethernet)
        RX packets 506008  bytes 387032847 (369.1 MiB)
        RX errors 3  dropped 1  overruns 3  frame 0
        TX packets 103458  bytes 15283165 (14.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 16  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet  netmask
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 6827  bytes 541916 (529.2 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 6827  bytes 541916 (529.2 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet  netmask  broadcast
        inet6 fe80::26fd:52ff:fe7c:dc7a  prefixlen 64  scopeid 0x20<link>
        ether 24:fd:52:7c:dc:7a  txqueuelen 1000  (Ethernet)
        RX packets 1854223  bytes 2764917834 (2.5 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1056396  bytes 95087957 (90.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I can connect to the wired network at school but I cannot connect at home. I know it is not my ethernet cable or my router as I can connect with a Windows 7 computer at home. Since I can connect at school, my ethernet adapter works but I don't have any idea why I can't connect at home. Any ideas what it could be?

I do not know what setup my university runs for the wired network except that I had to register my laptop on their website. At home, I have a Motorola SURFboard SB5101N cable modem and a Netgear N300 WNR2000v4 wireless router. My laptop is a Toshiba Satellite C50-A.


I do not have any proxy setup. Connected to the school network the output of ifup em1 is:

/usr/sbin/ifup: configuration for em1 not found.
Usage: ifup <configuration>

Apparently ethtool is the right one. The output of ethtool em1 is:

Settings for em1:
    Supported ports: [ TP ]
    Supported link modes:   10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
    Supported pause frame use: Symmetric Receive-only
    Supports auto-negotiation: Yes
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
    Advertised pause frame use: Symmetric
    Advertised auto-negotiation: Yes
    Speed: 100Mb/s
    Duplex: Full
    Port: Twisted Pair
    PHYAD: 0
    Transceiver: internal
    Auto-negotiation: on
    MDI-X: Unknown
Cannot get wake-on-lan settings: Operation not permitted
    Current message level: 0x000060e4 (24804)
                   link ifup rx_err tx_err hw wol
    Link detected: yes

I'll post the outputs while connected at home tonight.


While connected at home with the ethernet ... (more)

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ifup em1 and post results. Try switching to static ip. Also, ethtool em1 (I think that's the right one, correct me if I'm wrong).

abadrinath gravatar imageabadrinath ( 2014-08-07 02:38:48 -0600 )edit

Do you have some proxy set up?

lnxslck gravatar imagelnxslck ( 2014-08-07 03:42:44 -0600 )edit

can you ping the gateway "Netgear N300 WNR2000v4 wireless router" ?

natecult gravatar imagenatecult ( 2014-08-10 20:16:15 -0600 )edit

Switch to static ip help?

abadrinath gravatar imageabadrinath ( 2014-08-11 01:52:54 -0600 )edit

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answered 2014-08-18 08:56:52 -0600

cgonz31 gravatar image

Update to 3.14.8-200.fc20.x86_64 kernel. Problem disappeared on its own after update.

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Asked: 2014-08-06 22:18:02 -0600

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Last updated: Aug 18 '14