On 07/07/2011 04:38 PM,
lkrawczyk@amhealthgroup.com wrote:
>
> We've just puchased Cox Business Internet and I have been assigned a
> CIDR block. I have no experience with this. In the past I've been
> assigned a range of IPs that I basically forward from the external
> interface through the internal interface using iptables on a dedicated
> Linux box. I have multiple logical external and internal interfaces.
> The internal interfaces point at LANs using 192 subnets.
>
> What I'm confused about now is that my static ip is 70.xxx.xxx.xxx and
> my CIDR block is 24.yyy.yyy.yyy/28. Since the CIDR block is being
> routed through my static IP I don't really know what the external
> interface configuration should be.
>
> Does anybody have any experience with this?
>
> Thanks.
>
CIDR block is really easy, /28 means the first 28 bits of your subnet
mask are 1's and the remaining 4 are 0. So your subnet mask is:
255.255.255.240. So, it that address were 123.123.123.112/28, your
network would be 123.123.123.112, your hosts would be
123.123.123.113-126, and your broadcast would be .127
Hope that helps
Kevin Fries
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