IPv6 - Problems with Prefix Delegation and non static prefix

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Manu0815
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Joined: 04 Aug 2017
Posts: 1

PostPosted: Fri Aug 04, 2017 12:26    Post subject: IPv6 - Problems with Prefix Delegation and non static prefix Reply with quote
Hello and excuse every misspelling, english is not my native language.


First a little introduction in my network and how my ISP is handling IPv6:

ISP:
-Deutsche Telekom
-Dual-Stack
-Dynamic IPv6-Prefix,changing regularly due to german data privacy rules

DSL-Modem/Router:
-AVM Fritz!Box 7490
-Only used for VoIP (DECT) and Internet connection
-Activated and working Prefix Delegation /62 to Linksys WRT1900ACSv2 (delegated prefix lenght cannot be changed by this DSL-Router)

Linksys WRT1900ACSv2:
-Every Client is connected to this router (LAN/Wifi)
-IPv6 is working with radvd or dnsmasq (both ways are working)


[ISP]->[AVM 7490]->[Linksys WRT1900ACSv2]

The AVM is connected from LAN to the WAN-Port of the Linksys.

As I said, IPv6 is working perfectly, everything is working perfectly...until the prefix is changed by my ISP Sad


The new prefix is not delegated to the clients and the old prefix is not removed.
After a prefix change by my ISP, every client keeps the old prefix and because of this the clients are using an invalid Global IPv6.
=> IPv6 no more working

I have to completely restart the Linksys, after that the actual prefix is regulary delegated to the clients....until the next prefix change.

The DD-WRT version doesn`t matter, it happens with every version. I also tried it with LEDE and Open-WRT...same effect.

I searched the half internet but i am not able to find other people with the same problem!?
In my opinion it can`t be unusual that a non-business internet access underlies a non static IPv6 prefix.

Is there any solution to "update" a changed prefix to the clients and remove the old one?


Info:

If i am using radvd, my custom config is as follows:

Code:
interface br0 {
   AdvSendAdvert on;
   prefix 0:0:0:0::/64 {
    AdvOnLink on;
    AdvAutonomous on;
   };
};


If i am using dnsmasq:

Code:
local=/local/
expand-hosts
server=2001:4860:4860::8888 #Google-DNS
server=2001:4860:4860::8844 #Google-DNS
interface=br0
dhcp-range=::1000,::FFFF,constructor:br0,ra-stateless,12h
dhcp-option=option6:dns-server,[::]
ra-param=br0,10,300
enable-ra
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