[Dnsmasq-discuss] IPv6 dhcp/ra-issue

Oliver Rath rath at mglug.de
Mon Apr 21 13:28:30 UTC 2014 

Hi list,

Im trying to give my network-computers IPv6-Addresses constructed from
ppp0. In my config I get from my provider i.e. these (dynamic) IPv4 and
IPv6-addresses:

# ifconfig ppp0
ppp0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1492
        inet 80.137.126.83  netmask 255.255.255.255  destination
87.186.224.66
        inet6 fe80::43c:5b54:cea:b7ea  prefixlen 10  scopeid 0x20<link>
        inet6 2003:62:487f:b168:43c:5b54:cea:b7ea  prefixlen 64  scopeid
0x0<global>
        ppp  txqueuelen 3  (Punkt-zu-Punkt Verbindung)
        RX packets 2546359  bytes 3258224683 (3.0 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1550070  bytes 133189854 (127.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

One of my additional interfaces has this address:
# ifconfig p3p1
p3p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.2.254  netmask 255.255.255.0  broadcast 192.168.2.255
        inet6 fe80::210:f3ff:fe07:f7bf  prefixlen 64  scopeid 0x20<link>
        ether 00:10:f3:07:f7:bf  txqueuelen 1000  (Ethernet)
        RX packets 2806761  bytes 3337921408 (3.1 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1832066  bytes 326375284 (311.2 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



If I understand right, ive got an IPv6-subnet with the ability of ~250
clients (Telekom Germany), directly addressable from internet. Now i
want to configure dnsmasq in a way, that the clients get IPv4- (works,
internal only) and IPv6-addresses in a from internet addressable way.

Imho the fe80.. number is the *router*-ipv6-address, the 2003:... the
*host* ipv6-address. Now my clients should also get an ipv6-router *and*
-host address. Is this right?

My dnsmasq.conf (stripped):

except-interface=ppp0
dhcp-range=set:gw2,192.168.2.50,192.168.2.150,255.255.255.0,12h
dhcp-range=tag:gw2,::,constructor:ppp0
ddhcp-option=tag:gw2,128,192.168.2.254
enable-ra
dhcp-option=mtu,1492
dhcp-option=option6:dns-server,[::]
dhcp-option=252,"http://heimserver/wpad.dat"
log-queries
log-dhcp

Now I would assume, that my clientpc (p3p1 is bridged with wlan-ap)
would get an fe80:.. and another, from internet routable address. While
my card has the mac-address 00:21:6a:37:3f:72, i would assume getting an
IPv6 address like 2003:62:487f:b168:0021:6aFF:FE373f:72, but he doesnt:

wlan0 on my client-pc:

# ifconfig wlan0
wlan0     Link encap:Ethernet  Hardware Adresse 00:21:6a:37:3f:72 
          inet Adresse:192.168.2.100  Bcast:192.168.2.255 
Maske:255.255.255.0
          inet6-Adresse: fe80::221:6aff:fe37:3f72/64
Gültigkeitsbereich:Verbindung
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metrik:1
          RX-Pakete:2981577 Fehler:0 Verloren:0 Überläufe:0 Fenster:0
          TX-Pakete:2979080 Fehler:0 Verloren:0 Überläufe:0 Träger:0
          Kollisionen:0 Sendewarteschlangenlänge:1000
          RX-Bytes:3059635559 (3.0 GB)  TX-Bytes:2883630423 (2.8 GB)


Here /var/log/syslog on my client (sorry for the german parts):

Apr 21 14:57:29 hp dhclient: DHCPREQUEST of 192.168.2.100 on wlan0 to
255.255.255.255 port 67 (xid=0x48327e63)
Apr 21 14:57:29 hp dhclient: DHCPACK of 192.168.2.100 from 192.168.2.254
Apr 21 14:57:29 hp dhclient: bound to 192.168.2.100 -- renewal in 21016
seconds.
Apr 21 14:57:29 hp dhclient: DHCPACK of 192.168.2.100 from 192.168.2.254
Apr 21 14:57:29 hp dhclient: bound to 192.168.2.100 -- renewal in 21016
seconds.
Apr 21 14:57:29 hp NetworkManager[827]: <info> (wlan0): DHCPv4 state
changed preinit -> reboot
Apr 21 14:57:29 hp NetworkManager[827]: <info>   address 192.168.2.100
Apr 21 14:57:29 hp NetworkManager[827]: <info>   prefix 24 (255.255.255.0)
Apr 21 14:57:29 hp NetworkManager[827]: <info>   gateway 192.168.2.254
Apr 21 14:57:29 hp NetworkManager[827]: <info>   hostname 'hp'
Apr 21 14:57:29 hp NetworkManager[827]: <info>   nameserver '192.168.2.254'
Apr 21 14:57:29 hp NetworkManager[827]: <info> Activation (wlan0) Stage
5 of 5 (IPv4 Configure Commit) scheduled...
Apr 21 14:57:29 hp NetworkManager[827]: <info> Activation (wlan0) Stage
5 of 5 (IPv4 Commit) started...
Apr 21 14:57:29 hp avahi-daemon[801]: Joining mDNS multicast group on
interface wlan0.IPv4 with address 192.168.2.100.
Apr 21 14:57:29 hp avahi-daemon[801]: New relevant interface wlan0.IPv4
for mDNS.
Apr 21 14:57:29 hp avahi-daemon[801]: Registering new address record for
192.168.2.100 on wlan0.IPv4.
Apr 21 14:57:30 hp NetworkManager[827]: <info> (wlan0): device state
change: ip-config -> secondaries (reason 'none') [70 90 0]
Apr 21 14:57:30 hp NetworkManager[827]: <info> Activation (wlan0) Stage
5 of 5 (IPv4 Commit) complete.
Apr 21 14:57:30 hp NetworkManager[827]: <info> (wlan0): device state
change: secondaries -> activated (reason 'none') [90 100 0]
Apr 21 14:57:30 hp NetworkManager[827]: <info> NetworkManager state is
now CONNECTED_GLOBAL
Apr 21 14:57:30 hp NetworkManager[827]: <info> Policy set
'WLAN-001F3FD648F9' (wlan0) as default for IPv4 routing and DNS.
Apr 21 14:57:30 hp NetworkManager[827]: <info> Writing DNS information
to /sbin/resolvconf
Apr 21 14:57:30 hp dnsmasq[1563]: vorgelagerte Server von DBus gesetzt
Apr 21 14:57:30 hp dnsmasq[1563]: Benutze Namensserver 192.168.2.254#53
Apr 21 14:57:31 hp avahi-daemon[801]: Joining mDNS multicast group on
interface wlan0.IPv6 with address fe80::221:6aff:fe37:3f72.
Apr 21 14:57:31 hp avahi-daemon[801]: New relevant interface wlan0.IPv6
for mDNS.
Apr 21 14:57:31 hp avahi-daemon[801]: Registering new address record for
fe80::221:6aff:fe37:3f72 on wlan0.*.
Apr 21 14:57:41 hp NetworkManager[827]: <info> Activation (wlan0)
successful, device activated.
Apr 21 14:57:41 hp dbus[684]: [system] Activating service
name='org.freedesktop.nm_dispatcher' (using servicehelper)
Apr 21 14:57:41 hp wpa_supplicant[1062]: wlan0: CTRL-EVENT-SCAN-STARTED
Apr 21 14:57:41 hp dbus[684]: [system] Successfully activated service
'org.freedesktop.nm_dispatcher'
Apr 21 14:57:48 hp ntpdate[8010]: adjust time server 91.189.94.4 offset
0.007383 sec
Apr 21 14:57:50 hp NetworkManager[827]: <info> (wlan0): IP6 addrconf
timed out or failed.
Apr 21 14:57:50 hp NetworkManager[827]: <info> Activation (wlan0) Stage
4 of 5 (IPv6 Configure Timeout) scheduled...
Apr 21 14:57:50 hp NetworkManager[827]: <info> Activation (wlan0) Stage
4 of 5 (IPv6 Configure Timeout) started...
Apr 21 14:57:50 hp NetworkManager[827]: <info> Activation (wlan0) Stage
4 of 5 (IPv6 Configure Timeout) complete.
Apr 21 14:59:27 hp wpa_supplicant[1062]: message repeated 2 times: [
wlan0: CTRL-EVENT-SCAN-STARTED ]
Apr 21 14:59:31 hp wpa_supplicant[1062]: nl80211:
send_and_recv->nl_recvmsgs failed: -33
Apr 21 15:00:50 hp wpa_supplicant[1062]: wlan0: CTRL-EVENT-SCAN-STARTED


What Im doing wrong?

Tfh!
Oliver

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