Re: [LARTC] large routing table

[Rene Gallati <lartc@draxinusom.ch>]

Hello,

 > this is exactly why ip addresses are already grouped with respect to 
location.
 >
 > So it should be possible to optimize things, maybe use some perl with 
http://search.cpan.org/~nwetters/IP-Country-2.15/lib/IP/Country.pm
 > e.g. 194.0.0.0/8 is NL


Nope its not, I have 919 prefixes starting with 194 which are located in 
Switzerland. And they really are, for example picking one out randomly:

nslookup 194.242.34.1 yields:

Name:    switch.swissix.ch
Address:  194.242.34.1

whois:
inetnum:      194.242.34.0 - 194.242.34.255
netname:      SWISSIX
descr:        swissix, Swiss Internet Exchange
country:      CH
admin-c:      MC322-RIPE
tech-c:       MC322-RIPE
status:       ASSIGNED PI
notify:       noc@sissix.ch
mnt-by:       RIPE-NCC-HM-PI-MNT
mnt-by:       SWISSIX-MNT
mnt-lower:    RIPE-NCC-HM-PI-MNT

To the best of my knowledge, region based IP-ranges are in IPv6 but not 
in IPv4.

 > And I guess you can afford to make some errors, e.g. shaping a 
destination which shouldn't be shaped is not a crime if it wouldn't 
happen too often, just make sure you shape foreign IP's, how bad would 
it be to shape some non-foreign IP's accidently?


Problem is the server runs several applications and mine is but one of 
it. I am to make as little trouble as possible. However I do have a very 
good list of which IP ranges are ok and the complement are those that 
are not. My list comes directly from a skript that pulls it out of the 
core router.

Some of the prefixes can be aggregated but that is a minor optimization.

 > And, ofcourse, either "foreign IP's" or "non foreign IP's" is the 
smallest list, use the samllest list.


I have only the non-foreign list, but I am very sure that this one is 
smaller than the rest of the internet

Its exactly 6486 prefixes atm. (without aggregating those that are 
possible). In any case too many to process linearly.

CU

René



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