A simple question

[Torsten Luettgert]

On Don, 2004-08-19 at 06:18, Mark E. Donaldson wrote:
> As you might expect, it is quite easy to DOS the firewall itself
> when OUTPUT is set to DROP. And that is not a real good idea.

Please elaborate - why is it easy to DOS the firewall if the output
policy is DROP? You don't mean icmp/source-quench not getting
delivered or something?

> However, having said that, close scrutiny must be paid to what you
> allow out of the firewall and the necessary rules must be in place.

...which is why I personally use DROP as default policy for all
chains and explicitly allow everything I think necessary :-)

The only exception is in the mangle table, where I use ACCEPT
policies and just filter out the obvious spoofs, unclean frames
etc.

Greetings,
Torsten