From: John Lemonovich
> Sent: 13 December 2022 20:35
>
> How are you getting a solicit message through with :: as the source
> address, which I've found no
> server likes as I've tested 3 of them? Or is mine not using the link local
> address because I'm not
> doing anything with the default.script?
>
> The kernel is 5.4.13
I've just run a quick test.
strace of uhdcpc6 shows it doing something with a routing socket,
creating an IPv6 UDP socket, binding (probably to the interface)
and then doing s sendto() that specifies the multicast MAC.
(It puts the mcast address in the bind as well - probably ignored?)
The kernel is providing the source IPv6 address as part of its
normal UDP routing operations - the same as it does for any
other outbound packet.
tcpdump then shows the packet being sent from the link-local
address - as expected.
Three messages are sent, no reply received (I don't have a server
here and there is absolutely nothing else on that network segment).
The script is run 'leasefail' and it all retries a short time later.
On a network with a server it gets a response.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT,
UK
Registration No: 1397386 (Wales)
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