IP Filtering / CIDR Block Size / SprintLink
Alex P. Rudnev
alex at Relcom.EU.net
Tue Jan 28 10:43:25 UTC 1997
On Mon, 27 Jan 1997, James D. Butt wrote:
> > Who, in addition to SprintLink, is currently implementing IP
> > filtering based on CIDR block size (/19)? And where can I go
> > to learn more about this issue?
> I beleive AGIS has filters now. You can get the specifics off www.agis.net
> and click on Network Engineering and read the Nanog presentation info.
> The best place to go is the nanog archives...for more information about
> other providers...
Hmm, there is amazing - I understood 2 cases only -
- there is FILTERING in INTERNET,
- there is NOT FILTERING in INTERNET.
It's not big difference for us if there is 1 or 10 big ISP who make
But - all you know this filtering have 2 sides. First, it decreases
routing noice in the network. But, 2'th, it prevent address space saving.
It seems (reading your mail) /19 filtering is too raugph for the
INTERNET. It seems it's nessesary to have some filtering to prevent extra
grouth of the routing tables. Ok, why nobody discuss /20 or /21 filtering
I must repeat - it's not important for the small ISP and small
enterprises how many ISP over the world produce filtering - it's
important if the filtering exist somewhere or not.
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