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've read the "Q&A conducted by Christy Hudgins-Bonafield with Alecia Cooper, group manager SprintLink product management." at http://techweb.cmp.com/nc/online/sprint.html but couldn't seem to find much on what other carriers are doing. Thanks. Tim Nemec McLeodUSA __________________________________________________________________
Agis for one that I know of, last I heard Sprint had _stopped_ filtering blocks smaller than /19 when they fired Doran (I could be wrong). On Mon, 27 Jan 1997, McLeodUSA 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've read the "Q&A conducted by Christy Hudgins-Bonafield with Alecia Cooper, group manager SprintLink product management." at http://techweb.cmp.com/nc/online/sprint.html but couldn't seem to find much on what other carriers are doing.
Thanks.
Tim Nemec McLeodUSA __________________________________________________________________
[-] Brett L. Hawn (blh @ nol dot net) [-] [-] Networks On-Line - Houston, Texas [-] [-] 713-467-7100 [-]
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... -------------------------------------------------------------------------- James D. Butt 'J.D.' Network Engineer Voice 319-557-8463 Network Operations Center Fax 319-557-9771 MidWest Communications, Inc. Pager 319-557-6347 241 Main St. noc@mwci.net Dubuque, IA 52001 jbutt@mwci.net --------------------------------------------------------------------------
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 filtering. 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 _everywhere_? 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. Aleksei Roudnev, Network Operations Center, Relcom, Moscow (+7 095) 194-19-95 (Network Operations Center Hot Line),(+7 095) 239-10-10, N 13729 (pager) (+7 095) 196-72-12 (Support), (+7 095) 194-33-28 (Fax)
On Tue, 28 Jan 1997, Alex P. Rudnev wrote:
It's not big difference for us if there is 1 or 10 big ISP who make 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.
Well, that's not quite true. If it's only one or two and they don't filter their own customers, an ISP can simply get a T1 to everyone who filters and keep their small blocks working. David Schwartz
On Tue, 28 Jan 1997, David Schwartz wrote:
On Tue, 28 Jan 1997, Alex P. Rudnev wrote:
It's not big difference for us if there is 1 or 10 big ISP who make 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.
Well, that's not quite true. If it's only one or two and they don't filter their own customers, an ISP can simply get a T1 to everyone who filters and keep their small blocks working.
It's amazing - if I'll recomend our small ISP bye 256K link Moscow/USA (Sprint), guess what they say. But I am misunderstanded at all - first (in September or earlier) no one Registry over the world could not allocate for multi-home customer address space less than /19 (32 networks) and this prevented many enterprices or institutes from multihome connection to the Internet; just now (due to your answers) nobody filter our 195.xx or other RIPE's blocks except to /24 prefix; does it mean customers can get multihome access if they have /22 or /20 address space? And why Spring (and AGIS) have changed their filtering policy? Was it my imagination or they have filtered 195.xx block to /19 prefixes?
Well, that's not quite true. If it's only one or two and they don't filter their own customers, an ISP can simply get a T1 to everyone who filters and keep their small blocks working.
If that became a popular plan, it would be an incentive for large providers to filter as aggressively as they could get away with, to force more people to buy connectivity. Before long it would no longer be viable to run a T1 to every such backbone. -- Shields, CrossLink.
On Mon, 27 Jan 1997, McLeodUSA 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've read the "Q&A conducted by Christy Hudgins-Bonafield with Alecia Cooper, group manager SprintLink product management." at http://techweb.cmp.com/nc/online/sprint.html but couldn't seem to find much on what other carriers are doing.
Thanks.
Tim Nemec McLeodUSA __________________________________________________________________
AGIS published their route filter criteria: http://agisgate.agis.net/tsld002.htm Essentially, they will filter on /19 in the 206+. They will filter on /24 for the 192-205 range. Everything else (0-191) will be filtered in the /16. Lee
participants (7)
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Alex P. Rudnev -
Brett L. Hawn -
David Schwartz -
James D. Butt -
Lee Howard -
McLeodUSA -
shields＠crosslink.net