Pocster Posted November 26, 2021 Author Share Posted November 26, 2021 38 minutes ago, Mr Punter said: Maybe you are just getting the MAC address of the router. Excuse me! As an ex software engineer I know where my Mac's are coming from ? Link to comment Share on other sites More sharing options...
Pocster Posted November 26, 2021 Author Share Posted November 26, 2021 25 minutes ago, SteamyTea said: Why not use a host name to SSH into. You can, if you want, give it a number. I like IP's because I group things in ranges e.g. iPads are 192.168.8.50 -> 60 pi's 192.168.8.100 -> 130 etc. etc. Link to comment Share on other sites More sharing options...
Temp Posted November 26, 2021 Share Posted November 26, 2021 I only speak Arduino but perhaps.. https://www.reddit.com/r/raspberry_pi/comments/ebapu0/psa_in_raspbian_mac_addresses_are_set_on_first/ In Raspbian, MAC addresses are set on first boot and stored with SD card; swapping card to another Pi causes the latter to use the same MAC addresses Link to comment Share on other sites More sharing options...
Temp Posted November 26, 2021 Share Posted November 26, 2021 Also.. https://github.com/home-assistant/operating-system/issues/245 My hypothesis was correct; somehow the os/sd card stores the Mac address it was installed on (!). I removed the SD card, etched the image again, put it in the prod machine and it setup a new hassio and was visible on the correct IP; i.e. the install process worked out the Mac address of the hardware. Would love to know where the Mac address is stored and where I could have changed it rather than starting again! snip Your quickest way to fix might be to backup (in hassos), reinstall hassos from scratch on the new pi, which will use the new pi mac address, and then restore the hassos backup. Hope that make more sense to you than it does to me. 1 Link to comment Share on other sites More sharing options...
joth Posted November 26, 2021 Share Posted November 26, 2021 (edited) Looks like the Pi can load a MAC address override during kernel boot. https://raspberrypi.stackexchange.com/questions/68513/pi-using-a-random-mac-address-after-every-reboot-how-do-i-stop-this-behavior /boot/config.txt Perhaps you have that set in the SD card image you are using Btw MAC addresses are only supposed to be globally unique if allocated in the global (not locally administered) range, see b1 of the first byte in https://en.m.wikipedia.org/wiki/MAC_address That said I've seen manufacturers fail to assign unique addresses even within the so-called globally unique range. If you imagine a mass produced low cost devices (ESP32 *cough* *cough*) with multiple manufacturing lines running at once, perhaps in different buildings/cities, it takes a lot more time effort and money to coordinate all the lines to guarantee each device is unique, and no MAC addresses wasted (they are a limited resource after all). Much easier to blat a random address into each device and just hope no two identical snowflakes ever meet in the wild. Edited November 26, 2021 by joth 2 Link to comment Share on other sites More sharing options...
Bramco Posted November 26, 2021 Share Posted November 26, 2021 19 hours ago, pocster said: Yeah I detect router / switch are getting confused . I hesitate to ask this - but is it a virgin router? Cos they do get their MACs confused occasionally. Also what on earth possesses anyone to use fixed IP addresses - just use dynamic IP addresses and get on with the building work - you're just creating diversionary IT management work which ain't gonna get the place finished.... although reading between lines it may never be.... ? Simon 1 Link to comment Share on other sites More sharing options...
Pocster Posted November 26, 2021 Author Share Posted November 26, 2021 13 minutes ago, Bramco said: I hesitate to ask this - but is it a virgin router? Cos they do get their MACs confused occasionally. Also what on earth possesses anyone to use fixed IP addresses - just use dynamic IP addresses and get on with the building work - you're just creating diversionary IT management work which ain't gonna get the place finished.... although reading between lines it may never be.... ? Simon Not virgin but evil Hawaei - so I’m sure the great Chinese nation is interfering in my technological madness . Not a fan of dynamic ip’s . I tend to memorise the common ones . So bathroom ip for example I’ll know - easy to access rather than ‘finding ‘ it’s ip when it goes wrong . Stationary targets easier than a moving one . I’m allowed a little break of IT fun before I’m back to the bricks n mortar . Link to comment Share on other sites More sharing options...
SteamyTea Posted November 26, 2021 Share Posted November 26, 2021 3 hours ago, pocster said: So bathroom ip for example I’ll know That will be a Number 2 then. 1 Link to comment Share on other sites More sharing options...
TerryE Posted December 2, 2021 Share Posted December 2, 2021 There's a parameter in your /boot/config.txt which can be used to override the MAC addr: smsc95xx.macaddr=<whatever valid addr you want>. Link to comment Share on other sites More sharing options...
Pocster Posted December 2, 2021 Author Share Posted December 2, 2021 2 hours ago, TerryE said: There's a parameter in your /boot/config.txt which can be used to override the MAC addr: smsc95xx.macaddr=<whatever valid addr you want>. Yeah I found that before my solution and it didn’t seem to work . Link to comment Share on other sites More sharing options...
Pocster Posted December 10, 2021 Author Share Posted December 10, 2021 Definitely the devices i.e. mass produced with same MAC SO.... https://kalitut.com/change-raspberry-pi-mac-address/ Seems to work! Random MAC address!!! Link to comment Share on other sites More sharing options...
SteamyTea Posted December 10, 2021 Share Posted December 10, 2021 So you flashed your Mac. Link to comment Share on other sites More sharing options...
Pocster Posted December 10, 2021 Author Share Posted December 10, 2021 Sigh! Doesn't work!. The USB RJ45 dongle (i.e. crap mass produced Chinese thing ) all have the same MAC - can't see a way round it. I'm guessing that perhaps I need a bridge/switch in-between modem and unmanaged switches. But can you get one that allocates ( or spoofs ) MAC's and of course IP?? Link to comment Share on other sites More sharing options...
joth Posted December 10, 2021 Share Posted December 10, 2021 2 minutes ago, pocster said: can't see a way round it. Errr.... buy a less-cheap USB ethernet dongle. Link to comment Share on other sites More sharing options...
Pocster Posted December 10, 2021 Author Share Posted December 10, 2021 Just now, joth said: Errr.... buy a less-cheap USB ethernet dongle. Yeah I did think that. But whether I buy from Ebay/Amazon/Curry's etc. I've got no idea of the MAC situation I have I. All these devices are ultimately made in China. Just trying to find a permanent solution . I'm using pi zero with amp hat's because they are small and cheap but needed ethernet connection for reliability.Did try even doing POE to them - all the things I bought either failed or simply didn't work. Could swap back to raspberry pi 3/4's , but then I've got to buy new amp hats and they all use more juice. Link to comment Share on other sites More sharing options...
Pocster Posted December 10, 2021 Author Share Posted December 10, 2021 Right enough fecking about! Back to good old raspberry pi 3 or 4 (so a nice unique MAC ) ; dig out some amp hat's. Purchase a few poe hats. This should solve it all. Have quite a few zero's ( and amp hat's ) available if anyone is now interested??? Forgot I had this fan to overclock the bad boy! Link to comment Share on other sites More sharing options...
SteamyTea Posted December 10, 2021 Share Posted December 10, 2021 2 minutes ago, pocster said: Have quite a few zero's ( and amp hat's ) available if anyone is now interested Would have been, but need unique and static MAC address now I have taken your lead and ditched using host names. I take it this network is for the home automation system you are designing and coding for us all. Link to comment Share on other sites More sharing options...
Pocster Posted December 10, 2021 Author Share Posted December 10, 2021 23 minutes ago, SteamyTea said: Would have been, but need unique and static MAC address now I have taken your lead and ditched using host names. I take it this network is for the home automation system you are designing and coding for us all. Useless human. Link to comment Share on other sites More sharing options...
MJNewton Posted December 10, 2021 Share Posted December 10, 2021 1 hour ago, pocster said: Sigh! Doesn't work!. The USB RJ45 dongle (i.e. crap mass produced Chinese thing ) all have the same MAC - can't see a way round it. What?! *Now* you're telling us you're using a plug-in network adapter?! Talk about a wild goose chase. Yeah, if it's cheap Chinese nonsense then you can almost guarantee non-unique MAC addresses. Buy something better quality and your problem will be solved. 1 Link to comment Share on other sites More sharing options...
Pocster Posted December 10, 2021 Author Share Posted December 10, 2021 29 minutes ago, MJNewton said: What?! *Now* you're telling us you're using a plug-in network adapter?! Talk about a wild goose chase. Yeah, if it's cheap Chinese nonsense then you can almost guarantee non-unique MAC addresses. Buy something better quality and your problem will be solved. Forgot to mention they were zero's so yes have a usb/RJ45 splodge . None the less for IoT we need unique mac on everything. Surely the chinese can't think everyone will just have 1 usb/rj45 connector in their house?. But of course they don't care. I have loads of these. But for HA ( as it's Z wave ) they are used just for PoE capability therefore never cared about the Mac address. For whole house audio it matters Link to comment Share on other sites More sharing options...
SteamyTea Posted December 10, 2021 Share Posted December 10, 2021 (edited) 8 minutes ago, pocster said: Forgot to mention they were zero's Why not try Zero W, they have wifi and BT built in. And a more serious question, why not use hostnames? Edited December 10, 2021 by SteamyTea Link to comment Share on other sites More sharing options...
Pocster Posted December 10, 2021 Author Share Posted December 10, 2021 (edited) 12 minutes ago, SteamyTea said: Why not try Zero W, they have wifi and BT built in. And a more serious question, why not use hostnames? I prefer everything wired. For ethernet and power where possible. Wifi is left 'free' for mobile things like phones and laptops. You only have so much wifi bandwidth available. A host name still requires a unique IP ( which isn't a problem ). Non unique Mac addresses mess up ARP, network comms etc. . Switches/routers will send packet data to the wrong device if there is mac address confusion/duplication. Edited December 10, 2021 by pocster Link to comment Share on other sites More sharing options...
SteamyTea Posted December 10, 2021 Share Posted December 10, 2021 3 minutes ago, pocster said: Non unique Mac addresses mess up ARP, network comms etc I have only had about 5 Pis connect using host names and not had a problem, but may play sometime in the future when I am not commuting up country every weekend. Link to comment Share on other sites More sharing options...
Pocster Posted December 10, 2021 Author Share Posted December 10, 2021 (edited) 2 minutes ago, SteamyTea said: I have only had about 5 Pis connect using host names and not had a problem, but may play sometime in the future when I am not commuting up country every weekend. Only an issue if you add ethernet capability ( with chinese rubbish ). On WiFi you won't have those issues. Of course if you mean 3/4's etc. that have ethernet then they should all have unique Mac's . Why do you have 5? - which 5 people do you spy on? Edited December 10, 2021 by pocster Link to comment Share on other sites More sharing options...
SteamyTea Posted December 10, 2021 Share Posted December 10, 2021 Just now, pocster said: which 5 people do you spy on You, @Onoff, @joe90, @Omnibuswoman and my bathroom. 1 Link to comment Share on other sites More sharing options...
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