Re: routing invalid IP addresses

["Laurence F. Sheldon, Jr." <LarrySheldon () cox net>]

Geo. wrote:

> We had an attack here last night and the attack traffic was coming from an
> IP address of x.x.255.x which isn't a valid IP address yet the traffic was
> being routed over the internet (as far as I can tell anyway). When I
> attempted to track down the source I found our cisco routers wouldn't accept
> the address as valid so it was not possible to null route or trace the
> traffic.
>
> Has anyone else ever seen this before? Clue me in?

Invalid?  Really?  I used to manage a small collection of cisco routers
and I don't recall any of them complaining about such an address.

What color is the sky there?