• Re: Duplicate MAC addresses

    From Jim Jackson@3:770/3 to bob prohaska on Wed Jul 6 20:18:24 2022
    On 2022-07-06, bob prohaska <bp@www.zefox.net> wrote:
    Two Raspberry Pi 3s purchased about a year apart turned out to
    have duplicate MAC addresses. Anybody else seen this?

    I'm surprized. It's the sort of thing one expects with cheap copycat
    knockoffs.

    Have you put anything on the rpi forum?

    I run arpwatch on my lan server. If your Pi's have fixed IP configs, not
    DHCP, then it would tell you about the MAC address flipping between
    different IPs.

    cheers
    Jim


    A correspondent told me about a config.txt variable
    force_mac_address which seems to have worked around
    the problem. I incremented the last digit by one and
    all seems well, but it was a real hair puller for six
    months. Kept thinking it was an error on my part.

    Thanks for reading,

    bob prohaska

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  • From Ahem A Rivet's Shot@3:770/3 to The Natural Philosopher on Fri Jul 15 01:04:08 2022
    On Fri, 15 Jul 2022 00:26:22 +0100
    The Natural Philosopher <tnp@invalid.invalid> wrote:

    Do any serious computer people still use wifi?

    Most of the house is wired with CAT-6 and most things are plugged in but I fitted a couple of Unifi ceiling mount APs a few years back, there
    are a number of things in the house that use them - phones, laptops, a TV
    that gets moved around, visitors ... it works fine. But then I live out in
    the country where the neighbours are far enough away that there's no interference and someone wardriving would be very conspicuous.

    --
    Steve O'Hara-Smith
    Odds and Ends at http://www.sohara.org/

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  • From NY@3:770/3 to The Natural Philosopher on Fri Jul 15 11:51:02 2022
    "The Natural Philosopher" <tnp@invalid.invalid> wrote in message news:taq8mu$2r7g1$1@dont-email.me...
    On 14/07/2022 16:39, NY wrote:
    "The Natural Philosopher" <tnp@invalid.invalid> wrote in message
    news:tapb5q$2o694$1@dont-email.me...
    So the network still works with the router switched off?

    Fair enough. I suppose it allows you to reboot the router or move it from
    one place / mains socket to another. But only if the LAN segments to all
    the computers are connected via a separate network switch, and none are
    connected by wireless using the router's wifi.
    Do any serious computer people still use wifi?

    I use Ethernet for my computers, including my PVR computer etc, and the TV. Everything which it is easy to cable to the router. And things which need a reliable connection - my experience with wifi is that it can sometimes go
    loopy (lost connection or unusually slow) which requires a device to be rebooted, which is not possible when you are trying to access a computer remotely over Teamviewer or Real VNC while away from home.

    I also have a Linksys Velop mesh network which provides wifi to the rest of
    the house, for portable devices like laptops, phones, tablets which mainly
    need to access the internet but which don't generate heavy traffic within
    the house. Having said that, my laptop can quite happily access my PVR over wifi, for editing out continuity/commercials for programmes that I want to keep. It's a bit slower than Ethernet: it seems to average about 30-70
    MB/sec (so about 300 - 700 Mb/sec) rather than about 80 MB/sec over
    Ethernet, but that's only an issue for local traffic, because internet WAN traffic is limited to around 30 for my FTTC connection.

    Both Ethernet and wifi have their place. It's a damn sight easier to use
    wifi than to have to run Cat7 cable up into the loft, and then down into
    other rooms, just for wifi-only devices like phones and tablets. One of the mesh nodes also feeds Ethernet to the Hive hub which needs to be within wireless (proprietary, not wifi) range of the thermostats and the central heating controller, so can't be placed near the router (I tried...).

    The problem with the Velop system is that you can't control which nodes do
    or don't have 2.4 GHz enabled - its all or none. I have a few older devices that only talk 2.4 and not 5 GHz, so I need 2.4 turned on, but that means
    that the five nodes have overlapping 2.4 coverage if they are placed just at the limiting distance for 5 GHz backhaul to the primary node. This means
    that if there is a power cut and the nodes all turn on simultaneously, they spend a long time faffing around while they try to work out which 2.4
    channels they can use to minimise overlaps. I did have 6 nodes but I found
    out by trial and error than if one of them was turned off, I still got good coverage and it took less time for nodes to negotiate channels.

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  • From Tauno Voipio@3:770/3 to Marco Moock on Sun Jul 17 19:27:42 2022
    On 17.7.22 11.42, Marco Moock wrote:
    Am Samstag, 16. Juli 2022, um 23:56:16 Uhr schrieb The Natural
    Philosopher:

    It is not just for Ethernet. It also works on e.g. WiFi and Decnet to
    name but two

    Is the ARP protocol for Ethernet different from ARP for WiFi?
    They both use MAC addresses, the only difference I know is that WiFi
    supports a hight MTU than Ethernet.

    ARP is a protocol for resolving IPv4 addresses from hardware
    addresses in a broadcast-capable local net. IPv6 has its
    own neighbor discovery protocol.

    Beside Ethernet, the current IANA hardware type catalog
    lists 39 other hardware types, including e.g. Token Ring,
    ARCNET, ATM and SDLC/HDLC.

    --

    -TV

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