MSGID: <10iv40e$1e1ba$1@dont-email.me> 76cae8bf
REPLY: <5Rh*+QbvA@news.chiark.greenend.org.uk> d5c3d080
PID: PyGate 1.5.2
TID: PyGate/Linux 1.5.2
CHRS: ASCII 1
TZUTC: 0000
REPLYADDR Pancho.Jones@protonmail.com
REPLYTO 3:633/10 UUCP
On 12/27/25 23:25, Theo wrote:
> Jim Diamond  wrote:
>> I was looking at my network and discovered an IP which I didn't know about;
>> after a few seconds of investigation I discovered that one of my Pis (which
>> is on wifi only, and only has one wifi card) has two IPs.
>>
>> Two of my other Pis are running the same version of Raspberry Pi OS (i.e.,
>> "Debian GNU/Linux 12 (bookworm)").  They don't do this.
>>
>> Looking around the net, there are claims that this is because Pis might try
>> to netboot, and that later on in the boot process they also get their usual
>> IP the "usual" way.  (In my case I am using networkmanager.)
>>
>> I can't imagine what I did to make one of my Pis want to (try to) netboot.
>>
>> Has anyone here seen this, and, if so, know what grievous sins I have
>> committed to make this happen?  And how to make it stop?
> 
> Is this two IPv4 addresses?  Having multiple IPv6 addresses is completely
> routine.  As is having one IPv4 and one or more IPv6s.
> 

Yes, I have recently been experimenting with IPv6.

IPv6 uses:  Static Addresses, Link-Local, DHCPv6, Router Advertisements, 
and SLAAC.  Proving me with multiple, often random, IPv6 addresses. This 
totally broke my IP rule based routing.

Unlike my Linux machines, My Android devices take a whole IPv6 block 
(prefix delegation). I think I'll change all my Linux hosts to this too. 
I quite like the protection of random addresses, but want them 
constrained to a recognisable range for each host.

Some websites fail, some apt repos fail under IPv6.

IPv6 seems like a world of pain.


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