Ascend Router

Upgrade the firmware and a couple of new options will appear under the "Ethernet/Mod Config" menu:
Reply DirectedBcast Ping
Forward Directed Bcast

Setting both these options to 'No' will fix the problem.

Thanks to Clive Austin & Eric Stanfield for having written to us about it.


Cisco Router

conf t
!
int e0
!
no ip redirects
no ip mroute-cache
no ip unreachables
no ip directed-broadcast
!
!
int s0
!
no ip redirects
no ip unreachables
no ip directed-broadcast
!
!

Copy this, and paste it into your router config.
I would highly suggest doing this from console, and not a telnet session.

Some cisco devices have other ways of addressing interfaces.

For example, a 3620 with 1 serial and 3 ethernet ports, the "int" commands would look something like...

int e0/0
int e1/0
int e1/1

int s0/0

By egami (2001)

And don't forget www.pentics.net's a good white paper about smurf amps...