ppp: add reqprefix norelease ac_mac
Use ppp and enable autoipv6, odhcp6c supports reqprefix and norelease to minimize the chance of IPv6 PD changes.[1]
PPPoE supports connecting to a specific AC/BRAS by using the pppoe-mac parameter.[2]
1. https://github.com/openwrt/openwrt/blob/master/package/network/ipv6/odhcp6c/files/dhcpv6.sh#L67
https://github.com/openwrt/openwrt/blob/master/package/network/ipv6/odhcp6c/files/dhcpv6.sh#L77
2. https://github.com/ppp-project/ppp/blob/master/pppd/plugins/pppoe/plugin.c#L93
Signed-off-by: Andy Chiang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19978
Signed-off-by: Robert Marko <[email protected]>