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North American Network Operators Group

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Fw: GLBX ICMP rate limiting (was RE: Tier-1 without their own backbone?)

  • From: Gordon
  • Date: Thu Aug 28 09:51:14 2003

Of the DDOS attacks I have had to deal with in the past year I have seen
none which were icmp based.
As attacks evolve and transform are we really to believe that rate limiting
icmp will have some value in the attacks of tomorrow?

> On Wed, 27 Aug 2003, wrote:
> > We have a similarly sized connection to MFN/AboveNet, which I won't
> > recommend at this time due to some very questionable null routing
> > doing (propogating routes to destinations, then bitbucketing traffic
> > to them) which is causing complaints from some of our customers and
> > forcing us to make routing adjustments as the customers notice
> > MFN/AboveNet has broken our connectivity to these destinations.
> We've noticed that one of our upstreams (Global Crossing) has introduced
> ICMP rate limiting 4/5 days ago.  This means that any traceroutes/pings
> through them look awful (up to 60% apparent packet loss).  After
> contacting their NOC, they said that the directive to install the ICMP
> rate limiting was from the Homeland Security folks and that they would not
> remove them or change the rate at which they limit in the foreseeable
> future.
> What are other transit providers doing about this or is it just GLBX?
> Cheers,
> Rich

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