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Solved: Can find wired Ethernet connected Pi 4B on network
#1
I just booted my Raspberry Pi 4B with version 6.6.0, and the Pi connected via wired Ethernet to my switch, but I can’t find the Pi on the network. The switch says it has link on the port, but nmap shows no Pi in the 192.168.1.0 where the dynamic IPs are handed out.  Huh
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#2
Can you download
https://www.advanced-ip-scanner.com/

And scan for your Pi? Sometimes routers can be a bit picky when it comes to handing out DHCP addresses especially if a switch is involved...

Just thought, can you ping it?
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#3
(07-11-2020, 05:40 PM)Strider Wrote: Can you download
https://www.advanced-ip-scanner.com/

And scan for your Pi? Sometimes routers can be a bit picky when it comes to handing out DHCP addresses especially if a switch is involved...

Just thought, can you ping it?

I’m on a Mac, so nmap it is. I can clearly see all the other devices on the network, but no Pi. I can see that the router has not givet an IP to the Pi, but the switch has established a 1000M link to it. I just tried a brand new ethernet cable, same outcome.

I can see that the Pi is lighting the red LED for about four seconds, and in the last second the green LED also blinks. Then both LEDs are off for three seconds, and then the cycle repeats itself. Anyone know what that is about?

NB: I think it must be the power supply that is not up to snuff. Voltage was good, but could be ripple or other noise. Will try another.
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#4
(07-11-2020, 05:49 PM)hestehandler Wrote:
(07-11-2020, 05:40 PM)Strider Wrote: Can you download
https://www.advanced-ip-scanner.com/

And scan for your Pi? Sometimes routers can be a bit picky when it comes to handing out DHCP addresses especially if a switch is involved...

Just thought, can you ping it?

I’m on a Mac, so nmap it is. I can clearly see all the other devices on the network, but no Pi. I can see that the router has not givet an IP to the Pi, but the switch has established a 1000M link to it. I just tried a brand new ethernet cable, same outcome.

I can see that the Pi is lighting the red LED for about four seconds, and in the last second the green LED also blinks. Then both LEDs are off for three seconds, and then the cycle repeats itself. Anyone know what that is about?

NB: I think it must be the power supply that is not up to snuff. Voltage was good, but could be ripple or other noise. Will try another.

Ah, sorry - I didn't realise you were using a Mac. Good call on the PSU, a Pi 4 needs a good solid 5 v and current 3 amp for starters, also a decent quality PSU is a must - not necessarily a linear PSU either, ust one capable of providing the grunt.
To be honest I'd format the SD and use a newly downloaded image so at least you're onto a good start.
Good luck!
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#5
Check the RPi4B-specific "not booting..." sticky post on the Raspberry Pi Forum (https://www.raspberrypi.org/forums/viewt...1#p1485558). You can also read the sticky from the beginning to catch up on older RPis.

In particular, note this paragraph

Quote:Unlike other RPI, on a RPI4 the power LED is fully under the control of a GPIO expander, and when booting Raspbian resets this IO expander so causing the PWR LED to blink off on reboot. On booting the bootloader enables it again. But if the PWR LED goes off (blinks) at any other time it means have an unfit power supply/power cable. in short, the PWR LED should be always on except for a very short time just before a reboot happens.


The PWR LED is the red one.

Regards,
Kent
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#6
(07-12-2020, 11:26 AM)TheOldPresbyope Wrote: Check the RPi4B-specific "not booting..." sticky post on the Raspberry Pi Forum (https://www.raspberrypi.org/forums/viewt...1#p1485558). You can also read the sticky from the beginning to catch up on older RPis.

In particular, note this paragraph

Quote:Unlike other RPI, on a RPI4 the power LED is fully under the control of a GPIO expander, and when booting Raspbian resets this IO expander so causing the PWR LED to blink off on reboot. On booting the bootloader enables it again. But if the PWR LED goes off (blinks) at any other time it means have an unfit power supply/power cable. in short, the PWR LED should be always on except for a very short time just before a reboot happens.


The PWR LED is the red one.

Regards,
Kent

Thanks Kent. Was looking for that information, but didn’t find it yesterday. Seems I was right in thinking it was the PSU. So much for thinking I could use this one I had laying around. Anyway I want a linear PSU, but which one should I get without breaking the bank? Do you good folks have some suggestions?
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#7
I found a suitable USB3 cable and was able to connect the Pi to a USB-hub with a beefy power supply, and this time it worked perfectly.
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