[Dnsmasq-discuss] "no available addresses" with DHCPv6 stateful config

Simon Kelley simon at thekelleys.org.uk
Tue Nov 20 21:00:50 GMT 2018


This does seem odd. Would it be possible to capture the DHCP packets,
using wireshark or tcpdump? Send the dump directly to me if you don't
want to post it in public.

I'm not sure what the status of the WIDE client is - it's not common.
Maybe worth trying the ISC client instead, for quick fix. I can't see an
obvious problem with your config.



Cheers,

Simon.

> 
> sudo /usr/sbin/dnsmasq \
>   --bogus-priv \
>   --no-hosts \
>   --dhcp-authoritative \
>   --filterwin2k \
>   --expand-hosts \
>   --domain=test \
>   --local=/test/ \
>   --log-facility=- \
>   --log-dhcp \
>   --keep-in-foreground \
>   --bind-interfaces \
>   --interface=br1002 \
>   --except-interface=lo \
>   --listen-address=2001:ffff:1111::1 \
>   --dhcp-range=::2,::ffff,constructor:br1002,24h
> 
> That `listen-address` is definitely bound to the server side:
> 
> 6: br1002: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 8800 qdisc noqueue
> state UP group default qlen 1000
>     link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
>     inet6 2001:ffff:1111::1/64 scope global
>        valid_lft forever preferred_lft forever
> 
> What's happening is my DHCPv6 requests come in fine, but the server
> reports "no available addresses" even though I have what appears to be a
> valid range of available addresses:
> 
> dnsmasq-dhcp[746253]: 12629722 available DHCP range: 2001:ffff:1111::2
> -- 2001:ffff:1111::ffff
> dnsmasq-dhcp[746253]: 12629722 client MAC address: 52:54:00:5c:f1:32
> dnsmasq-dhcp[746253]: 12629722 DHCPSOLICIT(br1002)
> 00:01:00:01:23:7e:62:3a:52:54:00:5c:f1:31
> dnsmasq-dhcp[746253]: 12629722 DHCPADVERTISE(br1002)
> 00:01:00:01:23:7e:62:3a:52:54:00:5c:f1:31 no addresses available
> dnsmasq-dhcp[746253]: 12629722 tags: dhcpv6, br1002
> dnsmasq-dhcp[746253]: 12629722 sent size: 14 option:  1 client-id 
> 00:01:00:01:23:7e:62:3a:52:54:00:5c:f1:31
> dnsmasq-dhcp[746253]: 12629722 sent size: 14 option:  2 server-id 
> 00:01:00:01:23:83:8e:6b:52:54:00:14:c5:11
> dnsmasq-dhcp[746253]: 12629722 sent size: 24 option: 13 status  2 no
> addresses available
> dnsmasq-dhcp[746253]: 626033 available DHCP range: 2001:ffff:1111::2 --
> 2001:ffff:1111::ffff
> dnsmasq-dhcp[746253]: 626033 client MAC address: 52:54:00:5c:f1:32
> dnsmasq-dhcp[746253]: 626033 DHCPREQUEST(br1002)
> 00:01:00:01:23:7e:62:3a:52:54:00:5c:f1:31
> dnsmasq-dhcp[746253]: 626033 DHCPREPLY(br1002)
> 00:01:00:01:23:7e:62:3a:52:54:00:5c:f1:31 no addresses available
> dnsmasq-dhcp[746253]: 626033 tags: dhcpv6, br1002
> dnsmasq-dhcp[746253]: 626033 sent size: 14 option:  1 client-id 
> 00:01:00:01:23:7e:62:3a:52:54:00:5c:f1:31
> dnsmasq-dhcp[746253]: 626033 sent size: 14 option:  2 server-id 
> 00:01:00:01:23:83:8e:6b:52:54:00:14:c5:11
> dnsmasq-dhcp[746253]: 626033 sent size: 24 option: 13 status  2 no
> addresses available
> dnsmasq-dhcp[746253]: 626033 sent size: 16 option: 23 dns-server 
> 2001:ffff:1111::1
> 
> From my understanding of the man page and the older thread "Using IPv6
> DHCP"
> (http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2012q3/006306.html),
> this should be all I need to get a stateful DHCPv6 configuration. I've
> also tried every combination of options I can come up with in the
> `dhcp-range` config without success. Even if I set `static` mode and use
> a `dhcp-host` option for my test host, I get the exact same "no
> addresses available" message.
> 
> SLAAC works fine when I add `enable-ra`, and `ra-stateless` to
> `dhcp-range`, but this configuration to hand out only IPv6 addresses
> statefully never seems to work as described in that thread. The goal is
> to have a fully stateful DHCPv6 server that IPv6-only clients can get
> addresses from and, most importantly, update dnsmasq with their hostname
> (hence why I'm not using SLAAC or `ra-stateless`). The very specific
> binding config is due to me running a separate dnsmasq instance for each
> of an arbitrary number of interfaces.
> 
> Can anyone offer any advice on what I might be doing wrong here?
> 
> Thanks,
> Joshua M. Boniface
> 
> _______________________________________________
> Dnsmasq-discuss mailing list
> Dnsmasq-discuss at lists.thekelleys.org.uk
> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
> 

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