DHCPv6 and dynamic prefixes

Gaston Gloesener gaston.gloesener at web.de
Fri Nov 18 07:57:14 UTC 2011


Hello,

 

I am new to this list but have read the archives and hope I did not miss a
topic about this.

 

I am currently in progress to move my network to IPv6 (at least the DMZ for
now). As the router (Fritz!Box 7390) I was required to use by my ISP is not
providing DHCPv6 I plan to use a computer in the DMZ running Linux to do so
using ISC DHCP.

 

Since the router is not providing DHCPv6 there is no prefix delegation for
my internal router nor DHCP configuration for the Linux box available, the
latter bein configured by stateless auto configuration.

 

Now toward my question:

 

As the prefix delegated by the ISP will change over time I need a way for
the DHCP server to take this into account. And so far I did not find one. So
before I go into the source code looking if I could implement something I
wanted to ask the question first.

 

What I was looking for would be to associate a subnet 6 to an interface and
taking the prefix from there and change the lease in accordance with the
prefix when this changes. Something like:

 

subnet6 interface eth0/64 {.

 

or

 

subnet6 [eth0]/64 {.

 

Also regarding prefix delegation it should then be possible to use a
variable prefix like 

 

Prefix6 [eth0]/56:10 [eth0]/56:1f  /64

 

This would be using 56 bits from the eth0 prefix filling up with 10 to 1f
for delegating 64 bit prefix 

 

Anything like this possible today ? planned ?

 

 

 

 

 

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