Public Subnet re-assignments

[scott at viviotech.net (Scott)]

First, sorry if this is a bit of a noob question.

I'm trying to find a way of preventing a slew of traffic to an IP, or
IP's, when I join two /30 public subnets to a /29. It appears that while
the ranges are /30 someone is trying to brute-force the network and/or
broadcast addresses for the ranges. When I change them to be a /29, now
the router sees the traffic and starts dropping packets. Are there any
suggestions for mitigating this behavior or is it just the nature of the
beast?

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101010