On Tue, 11 Nov 2003, Peter Nelson wrote:
Ok, I'm pretty new at this and am probably in a bit over my head, but I
was looking for some pointers. I want to classify and then prioritize
traffic based on if it is to an Internet2 host, a host on campus or the
general internet. I got a dump from one of our campus's routers that
classifies everything as either I2 or local, only problem is that it is
~8000 entries. Now a lot of those entries can probably be combined down
(for example a couple of sequential /24's). My first question is does
anyone have any script that you give it multiple netmasks and it
combines it down to the simplest netmasks? Now my second question is
would using hashtables, maybe even nested ones be practical for this?
This is how I'm thinking of hashing so far:
Mask hashes children to check
0xFF00: 100 most 50-500
0x: 3000 most 20, some 50-200
0xFF00: 8000 all 10
You can link hashes to do what you want:
hash (made from first byte of the ip):
01 - another_hash_1
10 - another_hash_2
another_hash_1 entries (hash made from second byte):
01 - another_hash_on_level_2
10 - another_hash_on_level_2
and so on.
Obviously hashing based on 0xFF helps, but it still has to go through up
to 500 checks for somes hosts. Once I hash based on 0x the worst
case gets a lot better, and of course hashing on 0xFF makes almost
perfect hashes. Only thing is does a hash table lose it's point once
you start indexing everything? I was thinking maybe hashing based on
the 0xFF and then from there making hashes based on 0x00FF (and then
maybe an other layer of 0xFF). I admit I really don't know all that
much about the hashing algorighm and it's complexity so I don't know how
to approach this.
Thanks for any information,
Peter Nelson
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