>>I know?they would not be?good Internet citizen, but?if they needed to
>>do this for a temp basis does anyone see an issue?
Registering everything appropriately in the IRR will help prevent
things from smelling fishy.
It is your netblock, you get to use it as needed. This
is much better than getting another /20 for an EU site that only needs
Well, for something short term it is even less complex to get
provider-allocated space. That is, you can plan the non-temporary
long-term around your PI space and have a clean transition out
of PA space. Depending on your needs -and the provider's policies-
that might be the least-disruptive path for your traffic.
Also, filtering will not be an issue, if you are careful. Anyone who
does not hear the /24 will hear the /20. Packets for the /24 will go
to your US upstream.
Good advice in general for anyone concerned with more-specifics.
Reachability (and more forgiving damening) over long dstances is most
assured by making sure you are sourcing your least-specific. Lots of
networks trade more-specifics for better geographical dispersion, but
don't expect them to propagate further than those who agree to do so.
As long as your US upstream peers with your EU
upstream, and does not filter the /24 being announced over that peering
link, they will send the bits where they belong. Since this is much
more common than the alternative, you will likely have full
Anyone knows who filters these days?
Lots of folks; manually though? Few. Be sure your data is accurate in
[a trusted limb of] the IRR and it should be a non-issue.
Sprint stopped when Sean left. Verio stopped when Randy left.
Tying these policies to individuals is incorrect. Sprint, NTT/Verio and
others have slid their filter windows over time, roughly in step with
RIR allocation boundaries. For example, as recently as April of this
year Verio was using /22 in classical A and B space.
The baseline expectation that the DFZ carries rechability data and any
more-specific data of interest is exchanged between parties who want it,
request it, or pay for it still holds true. "Being conservative in
what you send" also applies to anticipating *others* not being "liberal
in what they receive".