On 2016-12-21 14:08, Michael Stilkerich wrote:
Well, dnsmasq needs to get the hostname to assign to a machine from
someplace. I don't know
all the possible places (search the manual page for that), but I can
think of:
1) Dnsmasq configuration (dhcp-host options)
2) /etc/ethers if enabled
3) suggested with the DHCPv4 request by the client
I think Windows 10 should suggest a hostname (3), at least it seems to
do for me. I have manually assigned
a hostname on the Windows computer, and dnsmasq knows and assigns it.
On 2016-12-20 12:53, Pali Rohár wrote:
Another option is to stop using SLAAC and start using DHCPv6 where you
have full control of assigned IPv6 addresses.
Such feature like host will "randomly" chose address is unsuitable for
setup when you need to have control of which address is assigned to
which device (e.g in this setup when you want to assign AAAA record).
I have managed to get DHCPv6 working now, I thought that windows 10
didn't have any support for it. It turned out that my ufw on my ubuntu
server were blocking the DHCPv6. I was in my simple mind just assuming
that DHCP and DHCPv6 used same ports
Still no hostname in the lease-file. However, I tried creating a virtual
win10 host and it seems to correctly set the hostname.
$ cat /var/lib/misc/dnsmasq.leases
1482450696 3e:fa:72:5b:c7:02 192.168.1.184 * 01:3e:fa:72:5b:c7:02
1482454218 08:00:27:60:fb:f2 192.168.1.108 budweiser 01:08:00:27:60:fb:f2
1482454219 34078759 2001:470:28:6ac::b8c2 budweiser
00:01:00:01:1f:6b:f9:80:08:00:27:60:fb:f2
1482454045 171899506 2001:470:28:6ac::e82c * 00:03:00:01:3e:fa:72:5b:c7:02
Note that the host budweiser correcly gets a host entry in the file. And
ping:ing the hostname on ipv4 and ipv6 yields the correct ip-address.
Been doing some wireshark-ing and found this request on the working host:
Frame 1998: 210 bytes on wire (1680 bits), 210 bytes captured (1680
bits) on interface 0
Ethernet II, Src: PcsSyste_60:fb:f2 (08:00:27:60:fb:f2), Dst:
IPv6mcast_01:00:02 (33:33:00:01:00:02)
Internet Protocol Version 6, Src: fe80::a00:27ff:fe60:fbf2, Dst: ff02::1:2
User Datagram Protocol, Src Port: 546, Dst Port: 547
DHCPv6
Message type: Request (3)
Transaction ID: 0xe6d3a2
Elapsed time
Client Identifier
Server Identifier
Identity Association for Non-temporary Address
Fully Qualified Domain Name
Option: Fully Qualified Domain Name (39)
Length: 24
Value: 000962756477656973657208686172746d61726b02736500
0000 0... = Reserved: 0x00
.... .0.. = N bit: Server should perform DNS updates
.... ..0. = O bit: Server has not overridden client's S bit
preference
.... ...0 = S bit: Server should not perform forward DNS updates
Client FQDN: budweiser.hartmark.se
Vendor Class
Option: Vendor Class (16)
Length: 14
Value: 0000013700084d53465420352e30
Enterprise ID: Microsoft (311)
vendor-class-data: MSFT 5.0
Option Request
Option: Option Request (6)
Length: 8
Value: 0011001700180027
Requested Option code: Vendor-specific Information (17)
Requested Option code: DNS recursive name server (23)
Requested Option code: Domain Search List (24)
Requested Option code: Fully Qualified Domain Name (39)
and this is the request for the broken host:
Frame 786: 160 bytes on wire (1280 bits), 160 bytes captured (1280 bits)
on interface 0
Ethernet II, Src: 3e:fa:72:5b:c7:02 (3e:fa:72:5b:c7:02), Dst:
IPv6mcast_01:00:02 (33:33:00:01:00:02)
Internet Protocol Version 6, Src: fe80::3cfa:72ff:fe5b:c702, Dst: ff02::1:2
User Datagram Protocol, Src Port: 546, Dst Port: 547
DHCPv6
Message type: Request (3)
Transaction ID: 0x83e70d
Elapsed time
Client Identifier
Server Identifier
Identity Association for Non-temporary Address
Option Request
Option: Option Request (6)
Length: 8
Value: 0011001700180027
Requested Option code: Vendor-specific Information (17)
Requested Option code: DNS recursive name server (23)
Requested Option code: Domain Search List (24)
Requested Option code: Fully Qualified Domain Name (39)
however it seems it tries to update its dns record like this:
973 84.385064 192.168.1.184 195.178.160.145 DNS 200
Dynamic update 0xf052 SOA hartmark.se CNAME AAAA A AAAA
2001:470:28:6ac::e834 AAAA 2001:470:28:6ac:3cfa:72ff:fe5b:c702 A
192.168.1.184
974 84.389532 195.178.160.145 192.168.1.184 DNS 200
Dynamic update response 0xf052 Not implemented SOA hartmark.se CNAME
AAAA A AAAA 2001:470:28:6ac::e834 AAAA
2001:470:28:6ac:3cfa:72ff:fe5b:c702 A 192.168.1.184
I need to do some more digging, but perhaps someone knows why the hosts
tries to do differently. And is the dynamic update dns some microsoft
dns server thingy?
Best regards,
Markus
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