Hi Guys,
this is my first tocip, i hope that someone are able to help me.
My RouterOS Version is 7.16rc4 and my RB is CCR1072
I’ll start with a little summary of the project,
I have this configuration

On the RB there is a pppoe server and the AAA and dhcp is delegated to a radiator server,also radiator handle the ipv4 and ipv6 pool through the attribute
Framed-IP-Netmask = 255.255.255.255
Framed-IP-Address = 192.168.23.3
Delegated-IPv6-Prefix = 2001:db8:100:3::/64
This is the flow
Mikrotik send access request to radiator
3bf10450 Code: Access-Request
3bf10450 Identifier: 35
3bf10450 Authentic: <2>P<213>H<200><211><178><223><235><231><157>DH<168><219><199>
3bf10450 Attributes:
3bf10450 Service-Type = Framed-User
3bf10450 Framed-Protocol = PPP
3bf10450 NAS-Port = 15728647
3bf10450 NAS-Port-Type = Ethernet
3bf10450 User-Name = “1”
3bf10450 Calling-Station-Id = “44:4E:6D:45:B9:AD”
3bf10450 Called-Station-Id = “test”
3bf10450 NAS-Port-Id = “ether1”
3bf10450 Acct-Session-Id = “81900007”
3bf10450 CHAP-Challenge = <229>P<10><26><130><148>D&hP<177><140><211><188>$<157>
3bf10450 CHAP-Password = <1><24>Z<129><212>.<189><<137><209><15>"H<230><143><199>b
3bf10450 NAS-Identifier = “TEST”
3bf10450 NAS-IP-Address = xx.xx.xxx.xx(public ip address)
3bf10450 Message-Authenticator = u<25><16>HD<195>_B<242><15><223><252><11>pj0
Radiator answer with
3bf10450 Code: Access-Accept
3bf10450 Identifier: 35
3bf10450 Authentic: <215><8>k<177><187>OEK<163><151><225><251>,<178><171>h
3bf10450 Attributes:
3bf10450 Framed-Protocol = PPP
3bf10450 Framed-Filter = “None”
3bf10450 Framed-IP-Netmask = 255.255.255.255
3bf10450 Framed-Compression = Van-Jacobsen-TCP-IP
3bf10450 Rate-Limit = “4000k/40000k 4000k/40000k 4000k/40000k 1 8 40k”
3bf10450 Idle-Timeout = 10
3bf10450 Framed-IP-Netmask = 255.255.255.255
3bf10450 Framed-IP-Address = 192.168.23.8
3bf10450 Framed-IP-Netmask = 64
3bf10450 Delegated-IPv6-Prefix = 2001:db8:100:7::/64
3bf10450 Message-Authenticator = <11>z7<166><228><146><204>;^<28><208><202>I<207>}<138>
so Mikrotik send an account request(START)
43edc0a0 Code: Accounting-Request
43edc0a0 Identifier: 36
43edc0a0 Authentic: L<168><0><197>)<249><254><2><226><23>$<152>.A<232>m
43edc0a0 Attributes:
43edc0a0 Service-Type = Framed-User
43edc0a0 Framed-Protocol = PPP
43edc0a0 NAS-Port = 15728647
43edc0a0 NAS-Port-Type = Ethernet
43edc0a0 User-Name = “1”
43edc0a0 Calling-Station-Id = “44:4E:6D:45:B9:AD”
43edc0a0 Called-Station-Id = “test”
43edc0a0 NAS-Port-Id = “ether1”
43edc0a0 Acct-Session-Id = “81900007”
43edc0a0 Framed-IP-Address = 192.168.23.8
43edc0a0 Acct-Authentic = RADIUS
43edc0a0 Event-Timestamp = 1726050547
43edc0a0 Ascend-Call-Attempt-Limit = 4202497
43edc0a0 Acct-Status-Type = Start
43edc0a0 NAS-Identifier = “TEST”
43edc0a0 Acct-Delay-Time = 0
43edc0a0 NAS-IP-Address = xx.xx.xxx.xx(public ip address)
but in this message mikrotik has not send the Delegated-IPv6-Prefix = 2001:db8:100:7::/64
and this is the answer of the start message
43edc0a0 Code: Accounting-Response
43edc0a0 Identifier: 36
43edc0a0 Authentic: 7<152><19>Y<26>ic<26><171><178><205>A<22><150><5>y
43edc0a0 Attributes: