IPv6 DHCP Client can't get prefix

marcoscardoso · Wed Mar 14, 2018 2:03 am

HI,

IPv6 DHCP client status don't change from "searching".

My conection: ISP modem > RouterBoard 750 > computer

Someone can help me?

null31 · Wed Mar 14, 2018 8:59 pm

Hi.
Please, post your IPv6 settings running this command on terminal:

/ipv6 export hide-sensitive verbose

And specify the connection type used as wan: pppoe, dhcp-client...

DiamondBA · Sat Feb 09, 2019 11:51 pm

I actually has the same problem with similar setup (ISP router->hex s->lan), if connecting directly to ISP router ipv6 internet is accessible. Will appreciate help with setup. WAN is ethernet/dhcp-client, ipv6 should be using slaac.

/ipv6 dhcp-client
add add-default-route=yes default-route-distance=1 dhcp-options="" disabled=no interface=ether1 pool-name=home-ipv6 pool-prefix-length=64 prefix-hint=::/0 request=prefix use-peer-dns=yes
/ipv6 nd
set [ find default=yes ] advertise-dns=no advertise-mac-address=yes disabled=no hop-limit=unspecified interface=all managed-address-configuration=no mtu=unspecified other-configuration=no ra-delay=3s ra-interval=3m20s-10m ra-lifetime=30m \
    reachable-time=unspecified retransmit-interval=unspecified
/ipv6 nd prefix default
set autonomous=yes preferred-lifetime=1w valid-lifetime=4w2d
/ipv6 settings
set accept-redirects=yes-if-forwarding-disabled accept-router-advertisements=yes-if-forwarding-disabled forward=yes max-neighbor-entries=8192

njalmeister · Thu Aug 29, 2019 3:26 pm

We are having the exact same problem. Mikrotik refuses to obtain address and/or prefix from Telenor LTE (4G) in Norway. Other devices work fine. Definitely a bug in the ipv6 dhcp client in RouterOS. Have tried with various RouterOS versions and mikrotik devices.

# aug/29/2019 14:23:10 by RouterOS 6.44.5
# software id = LTNJ-DE5T
#
# model = RouterBOARD 952Ui-5ac2nD
# serial number = 7C30080FF66A
/ipv6 dhcp-client
add add-default-route=yes default-route-distance=1 dhcp-options="" disabled=no interface=ether1 pool-name=basseng pool-prefix-length=\
    64 prefix-hint=::/0 request=prefix use-peer-dns=yes
/ipv6 nd
set [ find default=yes ] advertise-dns=no advertise-mac-address=yes disabled=no hop-limit=unspecified interface=all \
    managed-address-configuration=no mtu=unspecified other-configuration=no ra-delay=3s ra-interval=3m20s-10m ra-lifetime=30m \
    reachable-time=unspecified retransmit-interval=unspecified
/ipv6 nd prefix default
set autonomous=yes preferred-lifetime=1w valid-lifetime=4w2d
/ipv6 settings
set accept-redirects=yes-if-forwarding-disabled accept-router-advertisements=yes-if-forwarding-disabled forward=yes \
    max-neighbor-entries=8192

Debug log:

14:22:28 dhcp,debug resending.. 
14:22:28 dhcp,debug,packet send ether1 -> ff02::1:2%5 
14:22:28 dhcp,debug,packet type: solicit 
14:22:28 dhcp,debug,packet transaction-id: 115234 
14:22:28 dhcp,debug,packet  -> clientid:   00030001 cc2de03f 7c4a 
14:22:28 dhcp,debug,packet  -> oro: 23  
14:22:28 dhcp,debug,packet  -> elapsed_time: 237 
14:22:28 dhcp,debug,packet  -> rapid_commit: [empty] 
14:22:28 dhcp,debug,packet  -> ia_pd:  
14:22:28 dhcp,debug,packet    t1: 1800 
14:22:28 dhcp,debug,packet    t2: 2880 
14:22:28 dhcp,debug,packet    id: 0x1

Sob · Thu Aug 29, 2019 6:32 pm

Are you sure that other devices use DHCPv6 to get addresses and not SLAAC (autoconfiguration)?

njalmeister · Fri Aug 30, 2019 3:12 pm

I have tried to request both a Prefix and a Address on the Mikrotik. Neither works. Also tried with 6.46beta38 now. Same problem.

When I connect my Windows 10 PC to the modem it's online within seconds and it gets an IPv6 Address via DCHPv6 it seems?

Ethernet adapter Ethernet:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) I211 Gigabit Network Connection
   Physical Address. . . . . . . . . : BC-5F-F4-E6-0A-D2
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv6 Address. . . . . . . . . . . : 2a02:2121:2c0:13bd:5925:bb4d:3b36:1eeb(Preferred)
   Temporary IPv6 Address. . . . . . : 2a02:2121:2c0:13bd:4de4:7b8b:8c5b:6ca3(Preferred)
   Link-local IPv6 Address . . . . . : fe80::5925:bb4d:3b36:1efb%13(Preferred)
   Default Gateway . . . . . . . . . : fe80::c0ae:59ff:fe72:3ff3%13
   DHCPv6 IAID . . . . . . . . . . . : 45899764
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1E-0B-59-9A-BC-5F-F3-E6-0A-D2
   DNS Servers . . . . . . . . . . . : 2001:4600:4:fff::52
                                       2001:4600:4:1fff::52
   NetBIOS over Tcpip. . . . . . . . : Disabled
   
   
C:\Users\xxxxxxx>ping 2600::

Pinging 2600:: with 32 bytes of data:
Reply from 2600::: time=218ms
Reply from 2600::: time=175ms
Reply from 2600::: time=212ms
Reply from 2600::: time=156ms

Ping statistics for 2600:::
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 156ms, Maximum = 218ms, Average = 190ms

njalmeister · Mon Sep 02, 2019 3:55 pm

I found out that my router is actually online using ipv6 - despite having no ipv6 address on it's own...

Sob · Mon Sep 02, 2019 8:09 pm

That's what happens when you set Accept Router Advertisements to yes, router will get autoconfigured SLAAC address (if the other router advertises it) . Only the catch is that current RouterOS doesn't show that address in UI. It has it, uses it, but you don't see it.

njalmeister · Tue Sep 03, 2019 10:04 pm

trrunde · Wed Dec 18, 2019 1:14 am

I found out that my router is actually online using ipv6 - despite having no ipv6 address on it's own...

Try requesting both address and prefix, also setting prefix-hint to /48 for Telenor.

/ipv6 dhcp-client
add add-default-route=yes interface=your-interface pool-name=ipv6-pd prefix-hint=::/48 request=address,prefix

IPv6 DHCP Client can't get prefix

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