Hello to everybody
I am using Raspberry Pi 3. My raspberry pi 3 eth0 link is down.
Can anybody tell me how I can activate my raspberry eth0?
Which command can I use for activating the eth0 activation?
Best Regards
Usman
Re: eth0 link is down
Welcome to the Raspberry Pi forums.
Is there an Operating System running on your RPi?
If you are using the Raspberry Pi Foundation recommended and supported Raspbian Operating System on your RPi no intervention should be needed.
Simply connect a standard utp/rj45 'Ethernet' cable between the Ethernet jack on the RPi and a working network outlet that is connected to your local area network. If the lan has a DHCP server configured to allocate a dynamic IP address the RPi should respond automatically to that and thus join the network with no user action required.
If that isn't happening: check that the cable and network outlet are working by testing with some other device such as a laptop or desktop pc.
Have you made any changes to the Operating System that might prevent this automatic process from working?
Is this a 'home' network provided as part of a domestic broadband internet connection, or some sort of workplace or institution network in an office or dorm? If the latter, there might be security measures in place to prevent unauthorized access.
Is there an Operating System running on your RPi?
If you are using the Raspberry Pi Foundation recommended and supported Raspbian Operating System on your RPi no intervention should be needed.
Simply connect a standard utp/rj45 'Ethernet' cable between the Ethernet jack on the RPi and a working network outlet that is connected to your local area network. If the lan has a DHCP server configured to allocate a dynamic IP address the RPi should respond automatically to that and thus join the network with no user action required.
If that isn't happening: check that the cable and network outlet are working by testing with some other device such as a laptop or desktop pc.
Have you made any changes to the Operating System that might prevent this automatic process from working?
Is this a 'home' network provided as part of a domestic broadband internet connection, or some sort of workplace or institution network in an office or dorm? If the latter, there might be security measures in place to prevent unauthorized access.
Re: eth0 link is down
The commands ethtool and ifconfig could help to diagnose your problem.
Type these commands for installing ethtool[/b (you will need access to the Internet)]:
This example belongs to an old RPi 2:
Type these commands for installing ethtool[/b (you will need access to the Internet)]:
Code: Select all
sudo apt-get update
sudo apt-get install ethtool
Code: Select all
pi@rpi:~ $ ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/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: No
Link partner advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
pi@rpi:~ $ ifconfig
eth0 Link encap:Ethernet HWaddr b8:27:eb:57:87:84
inet addr:192.168.1.58 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::1f11:f7ea:e8e9:2eaf/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:7553978 errors:0 dropped:83000 overruns:0 frame:0
TX packets:7521642 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1523977193 (1.4 GiB) TX bytes:1257151240 (1.1 GiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:16202 errors:0 dropped:0 overruns:0 frame:0
TX packets:16202 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:1959843 (1.8 MiB) TX bytes:1959843 (1.8 MiB)
pi@rpi:~ $
Re: eth0 link is down
You can find the info provided by the command ethtool in the directory /sys/class/net/eth0 .
I have listed a couple of files but feel free to explore other files and directories (for example statistics).
Code: Select all
pi@rpi:~ $ cd /sys/class/net/eth0
pi@rpi:/sys/class/net/eth0 $ ls -l
total 0
-r--r--r-- 1 root root 4096 May 13 22:44 addr_assign_type
-r--r--r-- 1 root root 4096 May 13 22:44 addr_len
-r--r--r-- 1 root root 4096 May 13 22:44 address
-r--r--r-- 1 root root 4096 May 13 22:44 broadcast
-rw-r--r-- 1 root root 4096 May 13 22:44 carrier
-r--r--r-- 1 root root 4096 May 13 22:44 carrier_changes
-r--r--r-- 1 root root 4096 May 13 22:44 dev_id
-r--r--r-- 1 root root 4096 May 13 22:44 dev_port
lrwxrwxrwx 1 root root 0 May 13 22:44 device -> ../../../1-1.1.1:1.0
-r--r--r-- 1 root root 4096 May 13 22:44 dormant
-r--r--r-- 1 root root 4096 May 13 22:44 duplex
-rw-r--r-- 1 root root 4096 May 13 22:44 flags
-rw-r--r-- 1 root root 4096 May 13 22:44 gro_flush_timeout
-rw-r--r-- 1 root root 4096 May 13 22:44 ifalias
-r--r--r-- 1 root root 4096 May 13 22:44 ifindex
-r--r--r-- 1 root root 4096 May 13 22:44 iflink
-r--r--r-- 1 root root 4096 May 13 22:44 link_mode
-rw-r--r-- 1 root root 4096 May 13 22:44 mtu
-r--r--r-- 1 root root 4096 May 13 22:44 name_assign_type
-rw-r--r-- 1 root root 4096 May 13 22:44 netdev_group
-r--r--r-- 1 root root 4096 May 13 22:44 operstate
lrwxrwxrwx 1 root root 0 May 13 22:44 phydev -> ../../../../../../../../../../virtual/mdio_bus/usb-001:008/usb-001:008:01
-r--r--r-- 1 root root 4096 May 13 22:44 phys_port_id
-r--r--r-- 1 root root 4096 May 13 22:44 phys_port_name
-r--r--r-- 1 root root 4096 May 13 22:44 phys_switch_id
drwxr-xr-x 2 root root 0 May 13 22:44 power
-rw-r--r-- 1 root root 4096 May 13 22:44 proto_down
drwxr-xr-x 4 root root 0 May 13 22:44 queues
-r--r--r-- 1 root root 4096 May 13 22:44 speed
drwxr-xr-x 2 root root 0 May 13 22:44 statistics
lrwxrwxrwx 1 root root 0 May 13 22:44 subsystem -> ../../../../../../../../../../../class/net
-rw-r--r-- 1 root root 4096 May 13 22:44 tx_queue_len
-r--r--r-- 1 root root 4096 May 13 22:44 type
-rw-r--r-- 1 root root 4096 May 13 22:44 uevent
pi@rpi:/sys/class/net/eth0 $
Code: Select all
pi@rpi:/sys/class/net/eth0 $ cat operstate
up
pi@rpi:/sys/class/net/eth0 $ cat speed
100
pi@rpi:/sys/class/net/eth0 $
Re: eth0 link is down
Thank you!!!You can find the info provided by the command ethtool in the directory /sys/class/net/eth0 .
What I am about to say is not exactly on-topic in this thread, but I have been looking for something like this - that is, something in the pseudo-directories (i.e., /sys and/or /proc) that enumerates the network devices - for a very long time.
Among other things, this could be used to answer a question I see posted from time to time here - which is, "How do I figure out, programmatically, which device (of wlan0, wlan1) is the built-in WiFi and which is from a USB wireless dongle?".
"L'enfer, c'est les autres"
G fytc hsqr rum umpbq rm qyw rm rfc kmbq md rfgq dmpsk:
Epmu Sn!
J lnacjrw njbruh-carppnanm vxm rb mnuncrwp vh yxbcb!
G fytc hsqr rum umpbq rm qyw rm rfc kmbq md rfgq dmpsk:
Epmu Sn!
J lnacjrw njbruh-carppnanm vxm rb mnuncrwp vh yxbcb!