On 7/31/13, Blake Dunlap <ikiris () gmail com> wrote:
I bet blocking all SYN packets and non related flow UDP packets to
customers would be even more effective. Why don't we do that and be done
with it instead of playing whack a mole every 3 months when someone finds
some new service that was poorly designed so that it can be used to send a
Because it breaks applications that people are paying to be able to use.
The way I see it; more and more samples keep getting found about
protocols abused because networks have not implemented BCP38.
The latest SNMP trend is just another uptick to the sample size, and
proof that Closing off perfectly OK recursive DNS services is
totally inadequate and not a useful long-term fix to the problem of
DDoS or IP/UDP reflection attacks.
Asking folks to improve the security of access to their SNMP instances
is just chasing the latest exploit implementation, with no attention
to the vulnerability or the root cause....