<div dir="ltr"><div>No. <br></div><div>R2 does not provide any power to anything. Nothing plugged in its USB port.</div><div><br></div><div>On previous instances of this issue (months back), I was able to make things</div><div>work by rebooting both routers, then power cycling the Pi (which I don't want</div><div>to do, file system corruptions and all that). <br></div><div><br></div><div>Today, I can't recover. Maybe because I messed with the arp tables?<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Aug 5, 2019 at 6:18 PM Raymond Chen <<a href="mailto:raymondchen625@gmail.com">raymondchen625@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div dir="auto">Does your R2 provide power for your Raspberry Pi? I used to have a router behaving strangely when its USB was connected to my Raspberry Pi. I would try unplugging all devices from R2’s USB ports and see if that works. </div></div><div dir="auto"><br></div><div dir="auto">Raymond </div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Aug 5, 2019 at 16:50 Khalid Baheyeldin <<a href="mailto:kb@2bits.com" target="_blank">kb@2bits.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>I have this rare problem that is extremely annoying when it happens.</div><div>Basically, I have two routers. R1 is the main home router, connected <br></div><div>to the internet, managing DHCP, and so on. The other router, R2, has <br></div><div>no DHCP, and is simply for range, as well as a couple of RJ45 devices,</div><div>due to proximity to those devices.</div><div><br></div><div>Some WiFi devices that report temperature, humidity, ...etc. report</div><div>to R2 due to better range. A Raspberry Pi is connected to R2 directly</div><div>using RJ45. The Pi and the WiFi devices have static IPs in R1 served</div><div>using DHCP.</div><div><br></div><div>On rare occasions, the WiFi on R2 misbehaves. I can still ssh into the</div><div>Pi, but the WiFi devices have trouble reporting to the Pi. The solution</div><div>is to reboot the routers. Doing so makes WiFi more stable, but then</div><div>the Pi is inaccessible over ssh or HTTP. I have to cycle power to the <br></div><div>Pi, and I hate doing that since it may corrupt the file system on the</div><div>SD card. <br></div><div><br></div><div>Even when reboot both routers and cycle power, the Pi is not accessible</div><div>still. Pings fail, let alone ssh. Don't know why. <br></div><div><br></div><div>The only clue I can find is that when I use arp (from R1), the Flags <br></div><div>column for the Pi is 0x0 while it is 0x02 for all other devices. <br></div><div><br></div><div>I tried to delete the arp entry for the Pi, using this, from a Linux <br></div><div>machine:</div><div><br></div>arp -d 192.168.0.x<br><div>arp -s 192.168.0.x b8:27:xx</div><div><br></div><div>After that, I see this:</div><div><br></div><div>Address HWtype HWaddress Flags Mask Iface<br>zz ether b8:27:xx CM eth0</div><div><br></div><div>Again, the Flags column is CM, while it is C on other devices. <br></div><div><br></div><div>How can go about troubleshooting this extremely annoying problem?</div></div><div dir="ltr"><div><br></div><div>-- <br><div dir="ltr" class="gmail-m_8527866929531242121m_5742011257034018962gmail_signature"><div dir="ltr"><div>Khalid M. Baheyeldin<br></div></div></div></div></div>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div>Khalid M. Baheyeldin<br><a href="http://2bits.com" target="_blank">2bits.com</a>, Inc.<br>Fast Reliable Drupal<br>Drupal optimization, development, customization and consulting.<br>Simplicity is prerequisite for reliability. -- Edsger W.Dijkstra<br>Simplicity is the ultimate sophistication. -- anonymous<br><br></div></div></div></div>