I was reconfiguring my rpi computers today and accidently unplugged the ethernet cable to my rpi4b while my rpi4b (4G) 32bit Buster was running. After rebooting and repowering my rpi4 does not have ethernet active nor is the port on my ethernet switch
active. When I plug in my laptop using same cable the switch port is active and the Mac laptop has ethernet-internet. Is my rpi4 ethernet dead or is there someway to reactivate it?
--Steve

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nelso...@gmail.com <nelsonse48@gmail.com> wrote:

I was reconfiguring my rpi computers today and accidently unplugged the ethernet cable to my rpi4b while my rpi4b (4G) 32bit Buster was running. After rebooting and repowering my rpi4 does not have ethernet active nor
is the port on my ethernet switch active. When I plug in my laptop using
same cable the switch port is active and the Mac laptop has ethernet-internet.
Is my rpi4 ethernet dead or is there someway to reactivate it?

It does take quite a while for ethernet to 'wake up' on a Pi in my
experience. Leave it for several minutes at least before doing
anything more drastic.

--
Chris Green
·

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On 19/09/2022 23:32, nelso...@gmail.com wrote:

I was reconfiguring my rpi computers today and accidently unplugged the ethernet cable to my rpi4b while my rpi4b (4G) 32bit Buster was running. After rebooting and repowering my rpi4 does not have ethernet active nor is the port on my ethernet switch

active. When I plug in my laptop using same cable the switch port is active and the Mac laptop has ethernet-internet. Is my rpi4 ethernet dead or is there someway to reactivate it?

--Steve

Unplug the pi for a few minutes before rebooting?

--
Chris Elvidge
England

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On Tuesday, September 20, 2022 at 5:52:53 AM UTC-5, Chris Elvidge wrote:

On 19/09/2022 23:32, nelso...@gmail.com wrote:

I was reconfiguring my rpi computers today and accidently unplugged the ethernet cable to my rpi4b while my rpi4b (4G) 32bit Buster was running. After rebooting and repowering my rpi4 does not have ethernet active nor is the port on my ethernet

switch active. When I plug in my laptop using same cable the switch port is active and the Mac laptop has ethernet-internet. Is my rpi4 ethernet dead or is there someway to reactivate it?

--Steve

Unplug the pi for a few minutes before rebooting?

--
Chris Elvidge
England

Problem resolved (for now). I unpugged rpi for a couple hours. Didn't resolve issue. After several reboots I tried "ifconfig eth0 start". After two more reboots ethernet started working again! Did I fix it? I don't know but ethernet is now working
again. I am afraid to reboot again :-)
Thanks to Chris G. and Chris E.

--- SoupGate-Win32 v1.05
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nelso...@gmail.com <nelsonse48@gmail.com> wrote:

Problem resolved (for now). I unpugged rpi for a couple hours. Didn't resolve issue. After several reboots I tried "ifconfig eth0 start". After two more reboots ethernet started working again! Did I fix it? I don't know but ethernet is now

working again. I am afraid to reboot again :-)

It might be informative to report the state of the link lights next
to the RJ45 port. If neither lights up it's likely a faulty connection,
either in the Pi or the cable connectors.

Intermittents can take a long time to find, it's not a waste of time to keep written notes of what you've tried and what happened.

Good luck,

bob prohaska

--- SoupGate-Win32 v1.05
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nelso...@gmail.com wrote:

I was reconfiguring my rpi computers today and accidently unplugged the ethernet cable to my rpi4b while my rpi4b (4G) 32bit Buster was running. After rebooting and repowering my rpi4 does not have ethernet active nor
is the port on my ethernet switch active.  When I plug in my laptop using same cable the switch port is active and the Mac laptop has ethernet-internet.  Is my rpi4 ethernet dead or is there someway to reactivate it?

try the ethtool and post back the result.

also interesting - is it configured with dynamic (dhcp) or with static
config

--- SoupGate-Win32 v1.05
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On Friday, September 23, 2022 at 1:09:16 AM UTC-5, Deloptes wrote:

nelso...@gmail.com wrote:

I was reconfiguring my rpi computers today and accidently unplugged the ethernet cable to my rpi4b while my rpi4b (4G) 32bit Buster was running. After rebooting and repowering my rpi4 does not have ethernet active nor
is the port on my ethernet switch active. When I plug in my laptop using same cable the switch port is active and the Mac laptop has ethernet-internet. Is my rpi4 ethernet dead or is there someway to reactivate it?

try the ethtool and post back the result.

also interesting - is it configured with dynamic (dhcp) or with static
config

Bob: The link lights on neither the rpi nor the ethernet switch worked. They do now.
Deloptes: I never tried ethtool. I am almost a noob even though I have 9 rpis and had one 1 or more for several years :-(

Thanks to all for helping! --Steven

--- SoupGate-Win32 v1.05
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On 23/09/2022 16:07, nelso...@gmail.com wrote:

On Friday, September 23, 2022 at 1:09:16 AM UTC-5, Deloptes wrote:

nelso...@gmail.com wrote:

I was reconfiguring my rpi computers today and accidently unplugged the
ethernet cable to my rpi4b while my rpi4b (4G) 32bit Buster was running. >>> After rebooting and repowering my rpi4 does not have ethernet active nor >>> is the port on my ethernet switch active. When I plug in my laptop using >>> same cable the switch port is active and the Mac laptop has
ethernet-internet. Is my rpi4 ethernet dead or is there someway to
reactivate it?

try the ethtool and post back the result.

also interesting - is it configured with dynamic (dhcp) or with static
config

Bob: The link lights on neither the rpi nor the ethernet switch worked. They do now.

I am fairly sure that is so low level an issue that it won't be software.
That sounds like a dodgy cable or plug.

Deloptes: I never tried ethtool. I am almost a noob even though I have 9 rpis and had one 1 or more for several years :-(

Thanks to all for helping! --Steven

ethtool and ifconfig are good diagnostic tools. As are the lights on the ethernet interfaces

--
"First, find out who are the people you can not criticise. They are your oppressors."
- George Orwell

--- SoupGate-Win32 v1.05
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The Natural Philosopher wrote:

Bob: The link lights on neither the rpi nor the ethernet switch worked.
They do now.

I am fairly sure that is so low level an issue that it won't be software. That sounds like a dodgy cable or plug.

once there was some particle inside the RJ45 socket of the notebook which isolated one of the connectors and internet was not working

OP reported that same cable is working on another machine

Deloptes:  I never tried ethtool.  I am almost a noob even though I have >> 9 rpis and had one 1 or more for several years :-(

Thanks to all for helping!  --Steven

ethtool and ifconfig are good diagnostic tools. As are the lights on the ethernet interfaces

yes indeed and it would tell us if the link is active and how it is
configured

also there is nothing wrong to do something for the first time in your
life - in this case executing ethtool command in the command line (Actually sudo ethtool)

BR

--- SoupGate-Win32 v1.05
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On 24/09/2022 12:27, Marco Moock wrote:

Am 23.09.2022 um 08:09:14 Uhr schrieb Deloptes:

try the ethtool and post back the result.

also interesting - is it configured with dynamic (dhcp) or with static
config

This is unrelated until the ethernet link is established and the link
LED lights up.

Not only that, but my understanding is that the link lights will light irrespective of any software opening the Ethernet port.

In short lack, of link lights means the cables or connector ports are
faulty..


--
"What do you think about Gay Marriage?"
"I don't."
"Don't what?"
"Think about Gay Marriage."

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

Am 23.09.2022 um 08:09:14 Uhr schrieb Deloptes:

try the ethtool and post back the result.

also interesting - is it configured with dynamic (dhcp) or with static
config

This is unrelated until the ethernet link is established and the link
LED lights up.

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

On 24.9.22 15.04, The Natural Philosopher wrote:

On 24/09/2022 12:27, Marco Moock wrote:

Am 23.09.2022 um 08:09:14 Uhr schrieb Deloptes:

try the ethtool and post back the result.

also interesting - is it configured with dynamic (dhcp) or with static
config

This is unrelated until the ethernet link is established and the link
LED lights up.

Not only that, but my understanding is that the link lights will light irrespective of any software opening the Ethernet port.

In short lack, of link lights means the cables or connector ports are faulty..

To light the Ethernet link lights, the physical driver part of the
Ethernet chip (from MII to encoded Ethernet data) must be initialized,
so some driver functions are needed.

--

-TV

--- SoupGate-Win32 v1.05
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Am 24.09.2022 um 13:04:55 Uhr schrieb The Natural Philosopher:

On 24/09/2022 12:27, Marco Moock wrote:

Am 23.09.2022 um 08:09:14 Uhr schrieb Deloptes:

try the ethtool and post back the result.

also interesting - is it configured with dynamic (dhcp) or with
static config

This is unrelated until the ethernet link is established and the
link LED lights up.

Not only that, but my understanding is that the link lights will
light irrespective of any software opening the Ethernet port.

In short lack, of link lights means the cables or connector ports are faulty..

No, it is only relevant that both sides successfully established a
link (it is called so). If the interface is "down" the link isn't
possible, so the link LED will switch off. Also if there is a
speed/duplex mismatch (NICs are set to a specific speed, but not the
same), no link is there and the link LED won't light up permanently.

You can try out to set the link down with
ip link set eth0 down

Then the hardware is fine, but the connection isn't active.

--- SoupGate-Win32 v1.05
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On 26/09/2022 06:15, Marco Moock wrote:

Am 24.09.2022 um 13:04:55 Uhr schrieb The Natural Philosopher:

On 24/09/2022 12:27, Marco Moock wrote:

Am 23.09.2022 um 08:09:14 Uhr schrieb Deloptes:

try the ethtool and post back the result.

also interesting - is it configured with dynamic (dhcp) or with
static config

This is unrelated until the ethernet link is established and the
link LED lights up.

Not only that, but my understanding is that the link lights will
light irrespective of any software opening the Ethernet port.

In short lack, of link lights means the cables or connector ports are
faulty..

No, it is only relevant that both sides successfully established a
link (it is called so). If the interface is "down" the link isn't
possible, so the link LED will switch off. Also if there is a
speed/duplex mismatch (NICs are set to a specific speed, but not the
same), no link is there and the link LED won't light up permanently.

You can try out to set the link down with
ip link set eth0 down

Then the hardware is fine, but the connection isn't active.

Oh dear. I am not able to run that command on my Ethernet switch. It
doesn't understand TCP/IP at all.

Obviously it cannot be working at all.


--
The theory of Communism may be summed up in one sentence: Abolish all
private property.

Karl Marx

--- SoupGate-Win32 v1.05
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Am 26.09.2022 um 08:23:12 Uhr schrieb The Natural Philosopher:

Oh dear. I am not able to run that command on my Ethernet switch. It
doesn't understand TCP/IP at all.

Obviously it cannot be working at all.

You can run it on Linux. On Windows you can reach that by disabling the
network connection in ncpa.cpl.

Ethernet switches can also switch off ports.
Cisco uses "shutdown" in the interface subcommand to reach that.

--- SoupGate-Win32 v1.05
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On 26/09/2022 16:54, Marco Moock wrote:

Am 26.09.2022 um 08:23:12 Uhr schrieb The Natural Philosopher:

Oh dear. I am not able to run that command on my Ethernet switch. It
doesn't understand TCP/IP at all.

Obviously it cannot be working at all.

You can run it on Linux. On Windows you can reach that by disabling the network connection in ncpa.cpl.

Ethernet switches can also switch off ports.
Cisco uses "shutdown" in the interface subcommand to reach that.

My switch has no command interface at all. I shut it down by
disconnecting the power :=-)

Even a PC booted to its BIOS screen will light a link light on a switch.
It certainly doesn't require an operating system


--
Truth welcomes investigation because truth knows investigation will lead
to converts. It is deception that uses all the other techniques.

--- SoupGate-Win32 v1.05
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Am 26.09.2022 um 17:30:54 Uhr schrieb The Natural Philosopher:

My switch has no command interface at all. I shut it down by
disconnecting the power :=-)

A managed switch can be configured fi you like that possibility.

Even a PC booted to its BIOS screen will light a link light on a
switch. It certainly doesn't require an operating system

Most computers include an UEFI that supports networking (e.g. for
network boot, Wake on LAN, firmware update etc.). This is the reason
for that. There is a really small operating system like Intel Boot
Agent that controls the NIC in that state.

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