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linux - IPv6 prefix management

So, my SiXXS' POP seems to be in trouble and I was
thinking in changing to HE. The idea is connect to HE, change radvd setup and... lots of
other
thinks:




  • UFW,
    specially in laptops, which only allows access to some development services from some
    RFC1918 addresses and to my global IPV6 addresses


  • My servers have fixed IPv6 addresses
    to easily DNS setup



  • Some
    software needs some type of reference to the "local" addresses in setup (like squid acls
    or libvirt
    networks)


  • etc.




So
my question is: what is the best way to deal with this?, let's suppose that tomorrow I
need to change my tunnel broker, or for whatever reason I need to change my prefix and
use another provider as a backup, do I really need to review all my setup? The only
solution I can think of is ULAs and NAT which I dislike (or ULAs plus global addresses
but I think this setup is not recommended)



(A
possible solution if I understand correctly would be Mobile IPv6, but is this really an
option today?, how many providers work with
it?)



Summarizing: what options do I have to
simplify the administrative task of changing IPv6 prefix of a
network?




UPDATE



Thank
you very much for your answers but I think that I have left some things unexplained that
are important for this question: href="https://en.wikipedia.org/wiki/IPv6_address#Default_address_selection"
rel="nofollow
noreferrer">https://en.wikipedia.org/wiki/IPv6_address#Default_address_selection
gives a table of the selection preference in case you have more than one address. As
both SiXXS and HE use 2001:: prefixes, this means that (if I read the table correctly)
the global addresses will always be selected and never the ULAs. So if I setup squid to
limit access based on ULAs, it will not work because all clients will identify
themselves with the global address. There's another href="https://serverfault.com/questions/349950/ipv6-without-nat-but-what-about-an-isp-change">question
about the same issue but the answer, using both ULAs and global addresses works because
the public prefix is 2000:: in this case.



I am
right?, or I'm wrong about address preference?

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