Interesting question, you need to undestand subnetting. The /29 implys that is strictly within your block and if someone was to use the IP's it means he/she is already within your territory i.e. if it is within the public routable domain as you said. If private then make sure accounting comes in handy.

On Thu, Apr 21, 2011 at 12:48 PM, Steve Muchai <smuchai@gmail.com> wrote:

On Thu, Apr 21, 2011 at 12:37 PM, Simon Mbuthia <simon.mbuthia@gmail.com> wrote:
> Hi guys,
>
> I have a set of /29 public IP addresses, out of which I need to use.. say
> three public IP addresses, leaving me with some three free IP addresses
> since /30 allows for two hosts. I wouldn't want the extra IP addresses to
> remain unassigned - feels insecure. What would you advise me to do with
> them, to prevent someone from joining my /29 subnet??

filter all traffic to/from these IPs at your router?

BR
S

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