IPv6 and prefix pools
Dual-stack subscribers get a framed /64 and, where requested, a delegated prefix. IPv6 prefix pools are role-neutral: the reference site decides whether a drawn prefix is used as the NA/SLAAC prefix or as the delegated PD prefix.
Defining a prefix pool
assign must be longer than the base prefix length; the number of assignable prefixes is 2^(assign − base), capped at 65536. Distinct pools must not overlap. Creation applies live on commit; removing or reshaping a pool with live allocations keeps the old shape until restart so no subscriber prefix is orphaned.
ipv6 pool res 2001:db8:100::/40 assign 56 show ipv6 pool ppp ipv6 pool res # framed /64 (NA / SLAAC) ppp ipv6 pd-pool res # delegated PD prefix
One policy name, both stacks
RADIUS can select which pool by name in order: the Netvyn IPv6 pool VSAs, then the unified Framed-Pool attribute, then the configured pool name. Because Framed-Pool covers both families, a single policy name walls off v4 and v6 together — the classic walled garden with no separate v6 attribute.
Subscriber DNS
IPv6 DNS is delivered both as the RA RDNSS option for SLAAC clients and via DHCPv6, so any CPE learns it. Both families’ DNS apply live on commit and are shared by every pool, so they are configured globally rather than per pool.