[Dnsmasq-discuss] IPv6 dhcp strangeness

Kevin Darbyshire-Bryant kevin at darbyshire-bryant.me.uk
Sat Apr 30 11:32:08 BST 2016


Further clues maybe:  So initially when kermit comes up it grabs an IPv4
address and I see this entry in dnsmasq's lease database:
1462055024 e0:3f:49:a1:d4:aa 192.168.219.4 Kermit 01:e0:3f:49:a1:d4:aa

Which looks pretty normal to me.  Then a little while later, presumably
after a dhcpv6 request it gets changed to
1462055060 e0:3f:49:a1:d4:aa 192.168.219.4 Kermit
01:52:41:53:20:e0:3f:49:a1:d4:aa:00:00:09:00:00:00

There are also syslog messages of "abandoning lease to e0:3f:49:a1:d4:aa
of 192.168.219.4" which I don't get at all.




On 29/04/16 12:27, Kevin Darbyshire-Bryant wrote:
>
> Hi All,
>
>
> I've just noticed some strange/different behaviour with regard to
> dhcpv6 address allocation.  I've a couple of 'internal' machines that
> I'd like to have fixed ip addresses.  To that end, and it used to work
> I've got lines similar to: 
> dhcp-host=E0:3F:49:A1:D4:AA,192.168.219.4,[::0:4],Kermit   - In theory
> kermit gets 192.168.219.4 and the ipv6 address 'constructed prefix::0:4'
>
>
> Instead, these lines appear to be partially ignored with the host
> getting the usual pseudo random address constructed from the ipv6
> prefix/range.  An nslookup pointing to dnsmasq does return the '0:4'
> address, unfortunately that's not the address handed out by dhcp.  
> I'm also seeing ' abandoning lease to e0:3f:49:a1:d4:aa of
> 192.168.219.4' type warnings which is odd.  Also the entry in the
> leases database looks odd to me: 1461971298 e0:3f:49:a1:d4:aa
> 192.168.219.4 Kermit
> 01:52:41:53:20:e0:3f:49:a1:d4:aa:00:00:09:00:00:00 - that almost looks
> like an ipv6 type entry.
>
>
> Confused!
>
>
> Kevin
>
>
>
> _______________________________________________
> Dnsmasq-discuss mailing list
> Dnsmasq-discuss at lists.thekelleys.org.uk
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