[Dnsmasq-discuss] clients of DHCPv6 with constructed IPv6 address range are not notified on address range change

Simon Kelley simon at thekelleys.org.uk
Mon Sep 17 22:30:55 BST 2018


On 10/09/18 19:51, Andrey Vakhitov wrote:
> Hello Simon & Uwe,
> 
>> unfortunately that problem is seen often with providers in Germany, although the large ones no longer
>> do it (or allow to disable the disconnect). The problem is that German providers automatically 
>> disconnect the PPPoE connection every 24 hrs. After reconnecting you get a new address (IPv4) and 
>> prefix (IPv6). Since the changes we did (deprecating prefixes) this works fine  for standard router 
>> advertisements. But won't help for DHCPv6.
> 
> This is exactly my case, my ISP is o2.
> 
>>> Dnsmasq doesn't implement RECONFIGURE. It probably should. The main 
>>> problem, from a quick look at the RFC, is that RECONFIGURE mandates 
>>> use of security mechanism, and dnsmasq doesn't implement that either!
> 
> I know that it's against RFC but some routers (like the fritzbox I'm using, very popular choice in Germany) actually send RECONFIGURE without authentication. This is BTW the reason for introduction of "noauthrequired" config option in dhcpcd ;-)


I wonder if a very simple RECONFIGURE implementation would work here:
Just send a non-specific RECONFIGURE message to all clients when a new
IPV6 network turns up? Without security. That would be fairly simple to
implement and to configure.



Cheers,

Simon.

> 



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