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Re: Advanced Countermeasures to prevent a Ddos
- From: Christopher L. Morrow
- Date: Fri Jul 20 00:34:53 2001
On Fri, 20 Jul 2001, Hank Nussbacher wrote:
> At 16:38 19/07/01 -0400, you wrote:
> It all hinges on your upstream ISPs. The things to ask for are:
> - SYN and ICMP rate limiting: If you buy a T3 from your upstream, you
> should ask that they place on *their* peering routers and on the router
> facing you, Cisco rate limits of about 512kb/sec of ICMP and about
> 128kb/sec of SYNs. Pay extra if need be.
This means I only need a modem to synflood your network out of order.
Rate-limits are only worthwhile for 'well behaved' flows, DoS is by
definition NOT well-behaved.