Dear Maintainer,

could support for dynamic 6rd tunnels be added?

Parameters would be
* Base6rdInterface
the IPv4-Interface, e.g. ppp0

* 6rdPrefix
tunnel provider's prefix, e.g. 2001:55c for Comcast

* 6rdPrefixLength
tunnel provider's prefix length, e.g. 32 for Comcast or 28 for Vodafone

Interface specific subnet would be configured like for 6to4 tunnel in
the prefix statement:
prefix 0:0:000B:EEF::/64  {

(If additional parameters are required for different setups, maybe
6rdIPv4MaskLength, these could be added in a second step.)


A complete config with two subnets would look like this:

interface eth0
{
     AdvSendAdvert on;
     prefix 0:0:000B:EEF::/64
     {
         AdvOnLink on;
         AdvAutonomous on;
         Base6rdInterface ppp0;
         6rdPrefix 2001:55c;
         6rdPrefixLength 28;
     };
};

interface eth1
{
     AdvSendAdvert on;
     prefix 0:0:000D:EAD::/64
     {
         AdvOnLink on;
         AdvAutonomous on;
         Base6rdInterface ppp0;
         6rdPrefix 2001:55c;
         6rdPrefixLength 28;
     };
};