Re: [apops] Fwd: Korea Telecom leaking >1000 prefixes to Internet

  • To: Philip Smith <pfs at cisco dot com>
  • Subject: Re: [apops] Fwd: Korea Telecom leaking >1000 prefixes to Internet
  • From: Geoff Huston <gih at telstra dot net>
  • Date: Tue, 12 Dec 2000 06:30:52 +1100
  • Cc: gijucho at kt dot co dot kr, hanjh at kt dot co dot kr, apops at lists dot apnic dot net
  • In-reply-to: <5.0.2.1.2.20001212042122.00ab3a40@localhost>
  • Sender: owner-apops@lists.apnic.net
    • "FYI, no prefixes > /24 should appear in the Internet routing table."
      
      Let me offer a more accurate phrasing:
      
      FYI, if you choose to advertise prefixes which describe very small
      address blocks using prefix lengths between /25 to /32, you should be
      aware that a number of other Internet Service Providers use prefix
      length filtering and you may suffer impaired connectivity as
      a consequence of this action. Such ISPs will simply not hear
      your routing advertisement, and your customers may be unable to
      reach their customers via the Internet.
      
      The issue is that there is no routing police, and no forcing function.
      You _can_ announce small prefixes into the global routing table, but
      it is not considered an action that has either short or longer term
      positive benefit to either the advertiser, or anyone else.
      
      
      kind regards,
      
          Geoff
      
      
      (in nit-picking mode - sorry!)
      
      
      At 12/12/00 04:23 AM +1000, Philip Smith wrote:
      >Hi,
      >
      >I sent this three days ago, with no apparent resolution. Please can you, or your upstreams repair this leakage.
      >
      >kind regards,
      >
      >philip
      >--
      >
      >>Date: Sat, 09 Dec 2000 09:59:53 +1000
      >>To: gijucho at kt dot co dot kr, hanjh at kt dot co dot kr
      >>From: Philip Smith <pfs at cisco dot com>
      >>Subject: Korea Telecom leaking >1000 prefixes to Internet
      >>Cc: hostmast at nic dot or dot kr
      >>
      >>Hi,
      >>
      >>Since the 2nd of December, Korea Telecom has been leaking over 1000 prefixes from your aggregate blocks to the Internet routing table. I'm seeing these prefixes originating from AS9768 - an excerpt is below:
      >>
      >>gw>sh ip bgp regexp _9768$
      >>
      >>> 210.90.24.128/26 202.249.2.24                           0 2516 4766 3608 9768 i
      >>*> 210.90.32.128/25 202.249.2.24                           0 2516 4766 3608 9768 i
      >>*> 210.90.37.0/25   202.249.2.24                           0 2516 4766 7563 9768 i
      >>*> 210.90.48.128/25 202.249.2.24                           0 2516 4766 7563 9768 i
      >>*> 210.90.54.0/25   202.249.2.24                           0 2516 4766 7563 9768 i
      >>*> 210.90.61.0/25   202.249.2.24                           0 2516 4766 3608 9768 i
      >>*> 210.90.84.0/25   202.249.2.24                           0 2516 4766 7563 9768 i
      >>*  210.90.89.0      202.249.2.109                          0 2497 1239 3608 3608 9768 i
      >>*>                  202.249.2.24                           0 2516 4766 7563 9768 i
      >>*                   202.249.2.19                           0 2497 1239 3608 3608 9768 i
      >>*> 210.90.90.0/25   202.249.2.24                           0 2516 4766 7563 9768 i
      >>*> 210.90.112.0/25  202.249.2.24                           0 2516 4766 7563 9768 i
      >>*> 210.90.117.128/25 202.249.2.24                           0 2516 4766 3608 9768 i
      >>*> 210.90.123.240/28 202.249.2.24                           0 2516 4766 7563 9768 i
      >>
      >>Please will you fix your filters so that these prefixes are not announced to the Internet. FYI, no prefixes > /24 should appear in the Internet routing table.
      >>
      >>Korea Telecom is also announcing
      >>
      >>*> 105.200.136.0/30 202.249.2.24                           0 2516 4766 7563 9768 ?
      >>
      >>105.200.136.0/30 has not been assigned to any organisation in the public Internet, so should not be announced. Please can you fix this also.
      >>
      >>Thanks for your kind attention.
      >>
      >>philip
      >>--
      >
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