I set up three Artful VMs:
1. one with a dnsmasq in it.
2. the other one to correctly remote request from it
2. the other one to correctly remote request from it (but via dhcpcd instead of
isc-dhcp)
3. Added an extra separate virtual network without dhcp from the host where all
those guests can reach each other
Guest:
<interface type='network'>
<source network='noextdhcp'/>
<model type='virtio'/>
</interface>
Network definition:
<network>
<!-- dumb network -->
<name>noextdhcp</name>
<bridge name='virbrnoextdhcp'/>
</network>
This gave me an unconfigured and also otherwise bare "ens7" device in all three
guests.
The main guest got a static ipv6 set up like:
auto ens7
iface ens7 inet6 static
address 2607:f0d0:2001:000a:0000:0000:0000:0010
netmask 64
gateway 2607:f0d0:2001:000a:0000:0000:0000:0001
iface ens7 inet static
address 10.4.0.1
netmask 255.0.0.0
gateway 10.4.0.1
Which gives:
$ ip -6 address show ens7
3: ens7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
inet6 2607:f0d0:2001:a::10/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fef1:a702/64 scope link
valid_lft forever preferred_lft forever
The dnsmasq config I tried is:
interface=ens7
no-resolv
# uplink dns by host libvirt
server=192.168.122.1
# basic setup
bogus-priv
enable-ra
dhcp-range=::100,::1ff,constructor:ens7
dhcp-authoritative
# define domain as test1
local=/test1/
domain=test1
dhcp-fqdn
# enable logging
log-queries
log-dhcp
# killing old lease
$ sudo dhcpcd5 --release ens7; sudo dhcpcd5 --exit ens7; sudo kill $(pidof
dhcpcd5); sudo rm /var/lib/dhcpcd5/dhcpcd-ens7.lease6
# refresh
$ sudo dhcpcd5 -d ens7 --ipv6only
The same with dhclient now:
# release old lease
sudo dhclient -6 -r ens7
# get a new ipv6 one
sudo dhclient -6 -v ens7
Now what I see as difference between the two clients
# dhclient:
sent size: 14 option: 1 client-id 00:01:00:01:21:49:07:75:52:54:00:8e:c2:c6
sent size: 14 option: 2 server-id 00:01:00:01:21:48:f1:2e:52:54:00:04:69:2e
sent size: 40 option: 3 ia-na IAID=9355974 T1=1800 T2=3150
nest size: 24 option: 5 iaaddr 2607:f0d0:2001:a::172 PL=3600 VL=3600
sent size: 9 option: 13 status 0 success
sent size: 16 option: 23 dns-server 2607:f0d0:2001:a::10
# but dhcpcd5
sent size: 14 option: 1 client-id 00:01:00:01:21:48:ed:66:52:54:00:44:dd:64
sent size: 14 option: 2 server-id 00:01:00:01:21:48:f1:2e:52:54:00:04:69:2e
sent size: 0 option: 14 rapid-commit
sent size: 40 option: 3 ia-na IAID=359429 T1=1800 T2=3150
nest size: 24 option: 5 iaaddr 2607:f0d0:2001:a::134 PL=3600 VL=3600
sent size: 9 option: 13 status 0 success
sent size: 1 option: 7 preference 255
sent size: 16 option: 23 dns-server 2607:f0d0:2001:a::10
sent size: 32 option: 39 FQDN artful-dnsmasqv6-client.test1
Checking what the leases contain this is the same, the dhcpcd lease has the
domain name as FQDN, but dhclient holds nothing it seems.
# dhclient
$ sudo cat /var/lib/dhcp/dhclient6.leases | grep test1
# dhcpcd
$ sudo dhcpcd5 --dumplease ens7 --ipv6only | grep test1
dhcp6_fqdn='artful-dnsmasqv6-client.test1'
But there is no real "Domain name" option being passed.
I cross checked by setting the server and clients for ipv4 and otherwise doing
the same.
There I see the domain-name being passed:
# dhcdpcd
sent size: 5 option: 15 domain-name test1
# dhclient
sent size: 5 option: 15 domain-name test1
So far all this is without libvirt, which means we can mark that part of the
tasks invalid.
I thought I found an option in [1], but "dhcp-option=option6:domain-name"
doesn't exist.
I found that dnsmasq lists what it thinks it can pass.
$ dnsmasq --help dhcp6 | grep -i domain
21 sip-server-domain
24 domain-search
29 nis-domain
30 nis+-domain
$ dnsmasq --help dhcp | grep -i domain
15 domain-name
40 nis-domain
64 nis+-domain
119 domain-search
See that there is no domain-name in the dhcp6 case.
Trying to further limit the packages we have to search by changing from dnsmasq
to isc-dhcp-server.
$ cat /etc/dhcp/dhcpd.conf | grep -v '^#'
option domain-name "test1.org";
option domain-name-servers ns1.test1.org, ns2.test1.org;
default-lease-time 600;
max-lease-time 7200;
ddns-update-style none;
subnet 10.4.0.0 netmask 255.255.0.0 {
range 10.4.0.100 10.4.0.254;
}
$ cat /etc/dhcp/dhcpd6.conf | grep -v '^#'
default-lease-time 2592000;
preferred-lifetime 604800;
option dhcp-renewal-time 3600;
option dhcp-rebinding-time 7200;
allow leasequery;
option dhcp6.domain-search "test.test1.com","test1.com";
option dhcp6.info-refresh-time 21600;
subnet6 2607:f0d0:2001:a::/64 {
range6 2607:f0d0:2001:a::100 2607:f0d0:2001:a::1ff;
}
With that in place we have two things to realize:
1. no domain-name config for dhcpd6.conf available
2. clients get domain-name only on ipv4 requests/leases
Maybe dhclient has to ask for the option(s) explicitly? I really struggle (not
a dhcp expert) is it even meant to pass domain-name in ipv6 - I don't know?
I'd almost assume ipv6-dhcp has no domain-name attribute/option?
I Can't see more yet, maybe you can share your dnmasq.conf as well and maybe
you even have a lead at where the issue might be already?
[1]: https://egustafson.github.io/ipv6-dhcpv6.html
** Changed in: libvirt (Ubuntu)
Status: New => Invalid
** Summary changed:
- libvirt manager configured dhcpv6 network does not appear to sned domain
+ dhcpv6 does not appear to send *domain-name*
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to dnsmasq in Ubuntu.
https://bugs.launchpad.net/bugs/1716063
Title:
dhcpv6 does not appear to send *domain-name*
Status in dnsmasq package in Ubuntu:
New
Status in isc-dhcp package in Ubuntu:
New
Status in libvirt package in Ubuntu:
Invalid
Bug description:
libvirt manager configured dhcpv6 network does not appear to send
domain
I've configured dhcpv4 & v6 networking in the libvirt dialog (will provide
the config dump)
In the virtual machine guest i have specified to obtain inet6 dhcp.
With debug enabled that appears to receive only the new ipc6 address,
prefixlen and name servers, but not the domain setting, like it does
for ipv4.
I'm expecting something like new_ipv6_domain_name, or just
new_domain_name set for the ipv6 lease.
Not sure if it is a bug in libvirt or ics-dhcp
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1716063/+subscriptions
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