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[RRG] Geographic aggregation-based routing is at odds with reality
I think that geographical-based addressing arrangements, such as
those proposed in the recent thread by Heiner Hummel and Iljitsch
ban Beijnum) are not worth considering further because:
To the extent that routing scalability depends on geographically
determined assignment of address space, this is completely
incompatible with several fundamental needs of providers and
1 - That organisations who have been assigned address space
should be free to use it at various sites, and these
organisations are frequently global.
(Otherwise, each branch of an organisation - and
there could be hundreds at the granularity required
by the geographic aggregation system - will want to
get a large slab of address space, to cope with the
potential for future expansion.)
2 - Since the scalability which geographic aggregation
supposedly must depend on routers forwarding packets
in part or in whole according to their destination
(source too??) address, this is incompatible with
the need of organisations to have packets flow along
paths which are determined by their business relationships.
(It is assumed that the Internet's routing and addressing
system should not require any organisations to have a
business relationship or handle each other's packets
simply because they are in some kind of geographic
Bill's challenge to Heiner illustrates point 2 nicely:
3 - Organisations need to choose who they connect their networks
to according to various criteria which are at odds with
geographical aggregation, including being free to create
links to distant networks. Scenarios include:
a - Redundant paths to cope with (geographically) nearby
failures and points of congestion.
b - Similarly, paths (such as by a fibre link, not
tunnelling through the Net) which enable packets
to travel whilst meeting security and policy needs.
(For instance, for security - not through any
given country or company. Also, to meet local
Internet censorship, anti-terrorism etc. laws,
it may be necessary to make links which avoid
certain countries. Encryption is not a proper
solution, and security can be damaged just
by analysing traffic patterns, even if the
contents cannot be deciphered.)
c - Efficient traffic handling within global private
networks which nonetheless use public address space.
Having the scalability of the Internet's routing system depend on
assigning addresses according to geographical location - implicitly
with forwarding of packets being dependent upon those addresses - is
completely incompatible with the business, policy, security and
efficiency requirements of the great majority of providers and
Geographical aggregation is the sort of thing which looks good on
paper, but will never be acceptable in the real world.
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