Re: [Dorset] OT: WiFi Device Generating Multiple DHCP Requests
On Tuesday, 12 January 2021 09:48:43 GMT Terry Coles wrote: > My EV Charger is generating multiple DHCP Requests. This was first noticed > on Saturday when my son checked the router log and saw that one device was > being allocated an IP Address every 5 minutes or so. I isolated the > problem to the charger by turning stuff off until the problem stopped. > Normally the charger is connected to a WiFi Extender but I get the same > problem when it is connected directly to the Router. Pod-point is claiming that this is normal behaviour. According to their support Rep, he has spoken to the software team and the charger asks for an IP Address every time it wants to send data to the Pod-Point server. I have tried to convince him that this is not normal behaviour and I think he may have understood. He has fed my comments back to the software team. I won't hold my breath -- Terry Coles -- Next meeting: Online, Jitsi, Tuesday, 2021-02-02 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
Re: [Dorset] OT: WiFi Device Generating Multiple DHCP Requests
On Tuesday, 12 January 2021 14:20:42 GMT Ralph Corderoy wrote: > Is there any chance you've a device which is using the same IP address > which the EV charger was being leased, perhaps because you've assigned a > static IP address in the past to some forgotten Pi, or because there's > an unwanted second DHCP server running? Unlikely unless there were several devices that happened to have the same IP Address as the Charger; it has been given at least four since this morning. The Router is a Netgear D7800 and only five static IPs have been set up. The Charger's IP Address is visible in the 'Attached Devices' list and there are no devices unaccounted for. None of the attached devices are running a DHCP Server; the Pi that did that is in the cupboard and it did it on another sub-net anyway. -- Terry Coles -- Next meeting: Online, Jitsi, Tuesday, 2021-02-02 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
Re: [Dorset] OT: WiFi Device Generating Multiple DHCP Requests
Hi Terry, > Until a few minutes ago that is exactly what was happening, although > the system has now started allocating a different IP Address to the > Charger and updating much more often. Is there any chance you've a device which is using the same IP address which the EV charger was being leased, perhaps because you've assigned a static IP address in the past to some forgotten Pi, or because there's an unwanted second DHCP server running? -- Cheers, Ralph. -- Next meeting: Online, Jitsi, Tuesday, 2021-02-02 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
Re: [Dorset] OT: WiFi Device Generating Multiple DHCP Requests
On Tuesday, 12 January 2021 13:38:38 GMT Ian Morris wrote: > We live, as you know, quite close by. We are probably far enough apart > to be on separate low voltage segments of the mains distribution system, > However as an additional data point, I am dubious about the "Brown out". > My UPS would have gone into boost mode (it's line interactive) had this > happened on my segment and there is no sign (so if there was such an > event, it was on your segment only)... There was not even a blip here > (which the UPS often detects and triggers battery backed more for a few > seconds before switching back.) I did wonder about the brown-out story because nothing else has registered any kind of problem. > Even if the voltage had dropped to 178v, I'd guess that the power supply > for logic is some switched mode device which would likely handle this > without issue anyhow. I would hope so, but if there was a spike that was too short for the Charger's voltage monitor to register, then that could explain it. The fault light was on after all. Again, nothing else seems to have had a problem. > Is there any way to tell whether the device is reconnecting to wifi > my guess is that it's dropping wifi and then when it re-connects it's > that which is then triggering the DHCP reuqests. Could be external wifi > interference ... could you do a wifi scan to see if there's anything new > locally that's on the same channel? It's connecting OK, although it wasn't on Saturday before I power cycled it. There is nothing on the same channel. In any case the signal strength at the charger location is pretty much at maximum; when I connect to the WiFi Extender there is just two courses of brick between it and the charger because it is plugged into a socket just the other side of the house wall (and the wall is dry). I get exactly the same problem if I connect directly to the router, which is on a different channel and three rooms away (It's still stronger than any of the other signals nearby because it has multiple antennas and a powerful RF Amp in it). I can see no co or adjacent channel signals that are anything like as strong as the Extender or the main router signals. I don't believe that this is a problem caused by noise or interference, unless the noise or interference occurs every five minutes exactly. Until a few minutes ago that is exactly what was happening, although the system has now started allocating a different IP Address to the Charger and updating much more often. This setup has worked perfectly for about 18 months now. I'm uncertain when this issue started, but it certainly hasn't been apparent when I've examined the logs previously. -- Terry Coles -- Next meeting: Online, Jitsi, Tuesday, 2021-02-02 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
[Dorset] OT: WiFi Device Generating Multiple DHCP Requests
Hi, Not strictly Linux, but I wonder if there are any network aware people out there who can shed any light on my problem. My EV Charger is generating multiple DHCP Requests. This was first noticed on Saturday when my son checked the router log and saw that one device was being allocated an IP Address every 5 minutes or so. I isolated the problem to the charger by turning stuff off until the problem stopped. Normally the charger is connected to a WiFi Extender but I get the same problem when it is connected directly to the Router. When I went to turn off the charger its status light was red, signifying a failure. I power cycled it and the repeated DHCP requests stopped - for a while. Later I recycled both my router and my extender and the repeated DHCP requests stopped again. The Charger Supplier worked through the problem with me on Saturday and informed me that there had been a brown-out on 4th Jan where the mains voltage had dropped to 178 V (normally 230 V). He said that was what had caused the red status light. He also said that he thought the problem was caused by that and it should be OK. I last used the charger to charge my car on 1st Jan. This morning I power cycled the charger again and the problem is still there However, the repeated DHCP requests have since recurred. Are there any config settings in my router that could cause this? Every other client works fine, but I thought it worth checking. I get the problem whether I connect the charger to the extender or to the main router, so I'm excluding the extender from my diagnosis. I suspect that the brown-out damaged the charger electronics, although why I'm not sure. Of course the Supplier's monitoring wouldn't see high amplitude narrow spikes, so the brown-out may have been preceded by a large spike (nothing else failed though). The Charger is under Warranty, so I want to marshal my facts before I call back. -- Terry Coles -- Next meeting: Online, Jitsi, Tuesday, 2021-02-02 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
