Cox CIDR block configuration

[lkrawczyk at amhealthgroup.com]

So are you saying I should just change all my external interfaces to the CIDR address and forward them the way I've been doing to the LANs?  I tried that and had no luck.  Don't I need some interface to the static ip?


From: plug-discuss-bounces at lists.plug.phoenix.az.us [mailto:plug-discuss-bounces at lists.plug.phoenix.az.us] On Behalf Of Kevin Fries
Sent: Thursday, July 07, 2011 3:51 PM
To: Main PLUG discussion list
Subject: Re: Cox CIDR block configuration

On 07/07/2011 04:38 PM, lkrawczyk at amhealthgroup.com<mailto:lkrawczyk at 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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