I’m having a strange log after upgrading to any RB for versions above 6.34, this is giving this log below: pool6 refuse acquere: bad preferred prefix length!
I use ubiquiti antennas with ipv6, my pool for the DHCPv6 PD is a / 48 with prefix length / 56
Someone can help me?
can you post the log from the router? Also, some more explanation what is doing what in mode detail would be useful.
This log appeared after I updated the RBs to versions above 3.34
Versions Above 6.34*
Same issue here, I get the error log “pool6 refused acquire: bad preferred prefix length! (6)”.
I’m new to RouterOS and trying to setup ipv6 via pppoe. The Mikrotik router is the server, I defined an ipv6 pool, added it to the ppp profile. The radius is also sending a Framed-Ip-Prefix attribute. Both the pool and radius give prefix of /60. The client (Ubiquity EdgeRouter) is configured to expect a /60 too. Once the pppoe sessions is up it starts making requests to dhcp-v6 but I get this error in the logs.
Unfortunately the router uses a mmips firmware so I can’t downgrade to 6.34… does that mean there is no dhcp-v6 support currently for RouterBOARD 750G r3?
Also looks like this issue is has been reported by other people in beta forum http://forum.mikrotik.com/t/pool6-refused-acquire-bad-preferred-prefix-6/105914/1
same for me. Client is unifi gateway set for prefix len 64. I can provide packet capture if needed.
/ipv6 pool> print detail
Flags: D - dynamic
0 name=“ipv6_pool” prefix=2a01:XXXX:YY:100::/56 prefix-length=64
/ipv6 dhcp-server> print detail
Flags: D - dynamic, X - disabled, I - invalid
0 name=“dhcpv6” interface=bridge-dmz address-pool=ipv6_pool lease-time=1w rapid-commit=yes
preference=255 duid=“0x00030001000c42bd5c3e”
debug log:
11:37:16 dhcp,debug,packet recv server: dhcpv6 fe80::f29f:c2ff:fe15:b528 → ff02::1:2
11:37:16 dhcp,debug,packet type: solicit
11:37:16 dhcp,debug,packet transaction-id: 1fb2a4
11:37:16 dhcp,debug,packet → clientid: 00010001 21444c38 f09fc215 b528
11:37:16 dhcp,debug,packet → ia_na:
11:37:16 dhcp,debug,packet t1: 0
11:37:16 dhcp,debug,packet t2: 0
11:37:16 dhcp,debug,packet id: 0x0
11:37:16 dhcp,debug,packet → oro: 23 24
11:37:16 dhcp,debug,packet → elapsed_time: 0
11:37:16 dhcp,debug,packet → rapid_commit:
11:37:16 dhcp,debug,packet → ia_pd:
11:37:16 dhcp,debug,packet t1: 0
11:37:16 dhcp,debug,packet t2: 0
11:37:16 dhcp,debug,packet id: 0x0
11:37:16 dhcp,debug,packet → ia_prefix:
11:37:16 dhcp,debug,packet prefix: ::/64
11:37:16 dhcp,debug,packet valid time: 4294967295
11:37:16 dhcp,debug,packet pref. time: 4294967295
11:37:16 dhcp,debug processing client:21444c38f09fc215b528 iapd:0x0
11:37:16 dhcp,error pool6 refused acquire: bad preferred prefix! (6)
11:37:16 dhcp,debug binding not found
11:37:16 dhcp,debug,packet send dhcpv6 → fe80::f29f:c2ff:fe15:b528%13
11:37:16 dhcp,debug,packet type: reply
11:37:16 dhcp,debug,packet transaction-id: 1fb2a4
11:37:16 dhcp,debug,packet → clientid: 00010001 21444c38 f09fc215 b528
11:37:16 dhcp,debug,packet → serverid: 00030001 000c42bd 5c3e
11:37:16 dhcp,debug,packet → rapid_commit:
11:37:16 dhcp,debug,packet → dns_servers:
11:37:16 dhcp,debug,packet 2001:4860:4860::8888
11:37:16 dhcp,debug,packet → ia_pd:
11:37:16 dhcp,debug,packet t1: 302400
11:37:16 dhcp,debug,packet t2: 483840
11:37:16 dhcp,debug,packet id: 0x0
11:37:16 dhcp,debug,packet → ia_prefix:
11:37:16 dhcp,debug,packet prefix: ::/64
11:37:16 dhcp,debug,packet valid time: 0
11:37:16 dhcp,debug,packet pref. time: 0