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I have installed Raspbian and have attached 2TB External Hard Disk via USB with ext4 partition. I am trying to use it as a NAS device. Also I am accessing Pi over SSH from LAN and also from Internet. When I am accessing over Internet it gets disconnected randomly, lights on the board keep on blinking. It is not shown in connected devices list on my router Netgear (wnr2000v3). I am not able to figure out what is going wrong.

First I had connected via Ethernet and I have also tried using WiFi card but the case is same.

vedarthk
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    Maybe a power issue? Is your hard drive also receiving its power from its own adapter or an expertnally powered usb-hub? Running low on power can result in some awkward behavior rather than shutting down the pi entirely. (As far as I know, the wired network connection is hardwired in as a usb device.) – René Wolferink Mar 14 '13 at 09:24
  • USB drive have its own external adapter power supply. – vedarthk Mar 14 '13 at 09:31
  • can you test your power suply ? (http://www.rpiblog.com/2012/11/testing-raspberry-pis-power-supply.html) – David Mar 14 '13 at 10:18
  • I have the same issue. It's wired connected to my router and the LEDs stay on but I can no longer login to it with SSH. I run it headless. – Steven Roose May 11 '13 at 14:16
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    I may have solved the issue, as stated by @RenéWolferink it was a power issue, I was using 5v 700mA adapter rather it should be 5v 1200mA. – vedarthk May 12 '13 at 15:09
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    I had the same problem. I was using 5v 1000mA and it kept losing the connection. Switched to 5v 2100mA and all is well. – ow3n Nov 26 '13 at 21:54
  • I keep getting random disconnects from my network with client_loop: send disconnect: Broken pipe. I have a official Raspberry Pi USB-C Power Supply with these specs: AC 100-240V 50/60Hz input - DC 5.1V 3A output - 15.3W maximum output power. Is this enough power, or should I buy a new stronger one? If so, which one would you recommend? – Alex Jun 18 '20 at 08:34
  • Raspberry Pi 4 by the way – Alex Jun 18 '20 at 08:45

4 Answers4

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I had the same issue, using a 700 mA power supply. Power reqirements depend on what peripherals are connected. This power supply page concludes that using a 1200mA power supply from a reputable retailer will provide ample power to run the Raspberry Pi.

Glorfindel
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willer
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To sum up the answers given in the comments section (and get rid of another unanswered question):

Network disconnects were traced back to power supply issues. So beware of power brown-outs.

  • 5v 700mA adapter -> solution: 5v 1200mA adapter
  • 5v 1000mA adapter -> solution: 5v 2100mA adapter

Edit to add:

Here are some measurements regarding the power consumption of the various models of the Pi:

Ghanima
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I had this issue with a Raspberry Pi 4 w/ 7" touch display, powered via PoE HAT. My SSH sessions would disconnect, leaving the SSH (sshd) process still running on the RPi, leaving me to believe it was a hardware or power issue.

Disabling the Wi-Fi and Bluetooth radios using the hardware overlay system in Raspbian, edit /boot/config.txt:

dtoverlay=disable-wifi
dtoverlay=disable-bt

Seems to allow the RPi to operate without issues. The touch screen and RPi work fine so far.

Rancorm
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This solved my LAN disconnection issues after battling for months.

sudo ethtool --set-eee eth0 eee off

syncopium
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