Hi @milosbulajic98 ,
In the .pkt you provided, the DHCPv6 pool only has the DNS server configured. It should look like this.
ipv6 dhcp pool DHCP-R1
address prefix 2001:3100:20:2::/64 lifetime 172800 86400
dns-server 2001:3100:20:1::2
!
With this configuration, both the PC and the SBC should be able to get an IPv6 address via DHCPv6.
Regards,
Regards,
Harold Ritter, CCIE #4168 (EI, SP)