MSGID:  87d183ff
REPLY: <10j36cp$2iil2$1@druck.eternal-september.org> 37bfef16
PID: PyGate 1.5.2
TID: PyGate/Linux 1.5.2
CHRS: CP1252 2
TZUTC: 0000
REPLYADDR invalid@invalid.invalid
REPLYTO 3:633/10 UUCP
druck  writes:
> On 30/12/2025 01:00, Jim Diamond wrote:
>> However, it was worth a look.  Maybe.  According to the router, the
>> "mystery" address is paired with the wifi card's actual ethernet (MAC)
>
> MAC's aren't just Ethernet, WiFi and Bluetooth interfaces also have them.
>
>> address, whereas the "proper" address is (currently) paired with the
>> same ethernet address, except the last octet is 8C instead of 8D.
>> This makes me think that it is showing "Connected" or "Disconnected"
>> according to the ethernet address which is working, and it is not
>> careful about pairing that with the correct IPv4 address.
>
> You often see a difference of 1 when something creates a virtual
> network interface for use by a virtual machine or container. The
> virtual network card is assigned the second IP address and can operate
> independently from anything using the hosts primary interface and IP
> address.

At least on my 3B and 4B, the wired and wireless interfaces have
adjacent MACs.

    PS C:\Users\rjk> ssh shairo ip link show
    1: lo:  mtu 65536 qdisc noqueue state UNKNOWN mode
DEFAULT group default qlen 1000
        link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    2: eth0:  mtu 1500 qdisc noop state DOWN mode DEFAULT
group default qlen 1000
        link/ether dc:a6:32:cb:73:6b brd ff:ff:ff:ff:ff:ff
    3: wlan0:  mtu 1500 qdisc fq_codel state
UP mode DORMANT group default qlen 1000
        link/ether dc:a6:32:cb:73:6c brd ff:ff:ff:ff:ff:ff

If both interfaces were connected to the same network then I might see
something similar to Jim?s situation.

I did ask Jim for ?ip addr show? output but it has not appeared.

-- 
https://www.greenend.org.uk/rjk/

--- PyGate Linux v1.5.2
 * Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)
SEEN-BY: 105/81 106/201 128/187 129/14 305 153/7715 154/110 218/700
SEEN-BY: 226/30 227/114 229/110 112 134 200 206 275 300 317 400 426
SEEN-BY: 229/428 470 616 664 700 705 266/512 291/111 292/854 320/219
SEEN-BY: 322/757 342/200 396/45 460/58 633/10 280 414 418 420 422
SEEN-BY: 633/509 2744 712/848 770/1 902/26 2320/105 5020/400 5075/35
PATH: 633/10 280 229/426