Also note that dnsmasq can act as both a dhcpv6 server as well as serving router advertisements.
The ISC dhcp server only does dhcpv6, it does not have support (that I know of) for serving router advertisements.
If you do want your clients to use slaac addresses in addition to the dhcpv6 address, change:
AdvAutonomous on; # clients will use SLAAC (RFC 4862) addrs
If you do want your server to act as the client's default router (gateway), remove:
# AdvDefaultLifetime 0; # this server is a default router (gateway) when commented
or change the value to a non-zero number of seconds
Also note that dnsmasq can act as both a dhcpv6 server as well as serving router advertisements.
The ISC dhcp server only does dhcpv6, it does not have support (that I know of) for serving router advertisements.
If you do want your clients to use slaac addresses in addition to the dhcpv6 address, change:
AdvAutonomous on; # clients will use SLAAC (RFC 4862) addrs
If you do want your server to act as the client's default router (gateway), remove:
# AdvDefaultLifetime 0; # this server is a default router (gateway) when commented
or change the value to a non-zero number of seconds