20 Jul
2001
20 Jul
'01
12:30 a.m.
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.