ULA prefix lifetime

[Christoph Hartmann]

This patch of your would allow to specify a lifetime per prefix on all 
interfaces?

This would be nice as it would solve my problem. My idea for a patch 
would just set have set a custom lifetime for the ULA prefix to keep the 
configuration simple.


I'm new to the list - is there some kind of " voting system" to express 
interest to get a patch merged or looked into by the main developer?

//chriss

On 11/20/24 22:34, Paul D wrote:
> I proposed a 'fix' or, at least, a new feature to specify prefix lifetimes about a half-year ago which @Ansuel just reviewed a few days ago.
>
> See
>
> [RFC PATCH 08/14] router: clamp prefix valid_lt to interface valid_lifetime
>
> which... ideally should go in a separate patch (but this version depended on changes in the named patch-set)
>
> It's in his inbox for further review/merge.
>
> Otherwise prefixes stick around forever and start fucking shit up in your environment. I triggered a DoS in some systems which I won't name because of this >:)
>
>
>
>
> On 2024-11-20 16:54, chriss wrote:
>> Hi
>>
>> I have the following scenario:
>>
>> - a router with openwrt
>>
>> - a (german) VDSL connection with IPv4 and IPv6
>>
>> - a delegated IPv6 prefix (/56) that I use in my internal LAN segments
>>
>> My problem:
>>
>> I happens that I have to reconnect my VDSL (update of router, tripped over cable, whatever) - with that I get a new IPv6 prefix delegated. Now my clients have 2 prefixes/addresses. The old one (before the router reboot/reconnect) and a new one. That's bad because the old one won't route anymore. simple solution: set the lifetime to sth like 5min or so and the old addresses gets deprecated fast enough.
>>
>> Now my ULA addresses have also a lifetime of 5min - which is bad because after 5 min of router downtime (update) I lose my local delivery between clients.
>>
>> My solution (to this very specific and edge case problem) would be to set a large lifetime for ULA prefixes and use a short one for WAN delegated.
>>
>> My idea would be to allow the user to set (optional) a ULA lifetime where one can specify the ULA prefix. The odhcpd process would then use this config entry and send RA with the respective lifetime.
>>
>>
>> I write to gather feedback and maybe alternative solutions and if a path / PR for my solution would be accepted.
>>
>>
>>
>> kind regards
>>
>> //chriss
>>
>>
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>
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