iptables? issue

[Bruno Wolff III]

On Mon, Feb 13, 2012 at 12:33:14 -0800,
  Joe Zeff <joe at zeff.us> wrote:
> On 02/13/2012 11:34 AM, nullv at gmx.com wrote:
> >I'm hoping that you can point out what i'm missing here. I have a server
> >(router0) with a public ip 41.123.234.74/29 that's using an internet
> >modem 41.123.234.73/29 as a gateway.
> 
> If I'm not mistaken, an IP address with a /XX at the end is used to
> define a *range* of addresses, not a single address.  You'd use it
> to give the range of addresses on your LAN, or that your DHCP server
> is set to give out.  It's not appropriate when giving a specific
> machine's IP address unless my understanding of the terminology is
> worse than I think it is.  I don't *think* this is part of the
> issue, here, but it may be obscuring what's going on.  If nothing
> else, leaving off where it doesn't apply may help avoid confusion.

That notation can be used to define both the local IP address and the
network segment's IP address range at the same time. If you use the ip
command to set up an address on an interface, this is the notation used.