Cox CIDR block configuration

[lkrawczyk]

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.

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[Kevin Fries]

Post by lkrawczyk
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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[lkrawczyk]

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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[Kevin Fries]

Post by lkrawczyk
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?

CIDR is just another way of specifying an ip address. The following two
IP addresses are identical, the only difference is how it is specified.
Some devices prefer one way, other devices prefer the other, and some
will take either:

Address Specified Old Fashion Way:
Address: 123.123.123.112, Subnet Mask: 255.255.255.240

Same Address Specified the CIDR Way:
123.123.123.112/28

So, it sounds like you have two network addresses, as 70. address and a
24. address. It sounds like you need to route from one to the other.
Is this correct?

Kevin
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[lkrawczyk]

Cox says that they route the 24. CIDR through the 70. static though so it sounds like they have already done the routing. Do I need to do something else? They said I need a special router with 2 WAN ports.

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 4:12 PM
To: Main PLUG discussion list
Subject: Re: Cox CIDR block configuration

On 07/07/2011 05:05 PM, lkrawczyk at amhealthgroup.com<mailto:lkrawczyk at amhealthgroup.com> wrote:
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?
CIDR is just another way of specifying an ip address. The following two IP addresses are identical, the only difference is how it is specified. Some devices prefer one way, other devices prefer the other, and some will take either:

Address Specified Old Fashion Way:
Address: 123.123.123.112, Subnet Mask: 255.255.255.240

Same Address Specified the CIDR Way:
123.123.123.112/28

So, it sounds like you have two network addresses, as 70. address and a 24. address. It sounds like you need to route from one to the other. Is this correct?

Kevin
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[Kevin Fries]

To me it sounds like enterprise class service with a redundant uplink. If
that is the case you may be seeing one of two situations.

1. Both the 70 and 24 addresses are routing to you probably in a bound
connection. If this is the case the 70 is probably your public IP and the
24 is a redundant link for failover and the 70 IP will be redirected if 70
is not available, but you will get 1/2 speed.

2. 24 is you completely failiver circuit. It will behave like option 1
except either circuit can carry the full load.

Either way it sounds like the 70. Address is your public IP for all intents
and purposes.

Can anyone else with Cox Business Class confirm that? I have only set up
Cox at home for my mom.

Kevin
On Jul 7, 2011 5:24 PM, "lkrawczyk at amhealthgroup.com" <

Cox says that they route the 24. CIDR through the 70. static though so it

sounds like they have already done the routing. Do I need to do something
else? They said I need a special router with 2 WAN ports.
plug-discuss-bounces at lists.plug.phoenix.az.us] On Behalf Of Kevin Fries

Sent: Thursday, July 07, 2011 4:12 PM
To: Main PLUG discussion list
Subject: Re: Cox CIDR block configuration
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?

CIDR is just another way of specifying an ip address. The following two IP

addresses are identical, the only difference is how it is specified. Some
devices prefer one way, other devices prefer the other, and some will take

Address: 123.123.123.112, Subnet Mask: 255.255.255.240
123.123.123.112/28
So, it sounds like you have two network addresses, as 70. address and a

24. address. It sounds like you need to route from one to the other. Is this
correct?

Kevin

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[Lisa Kachold]

Correct...

The full block is what you want to use.

Ask for the complete router allocation sheet from Cox to be sure which are
unusable depending on subnetting.

http://support.coxbusiness.com/sdccommon/asp/contentredirect.asp?sprt_cid=7ec0f78e-f10d-4074-8375-655c64c08a6d#faq21

Post by Kevin Fries
To me it sounds like enterprise class service with a redundant uplink. If
that is the case you may be seeing one of two situations.
1. Both the 70 and 24 addresses are routing to you probably in a bound
connection. If this is the case the 70 is probably your public IP and the
24 is a redundant link for failover and the 70 IP will be redirected if 70
is not available, but you will get 1/2 speed.
2. 24 is you completely failiver circuit. It will behave like option 1
except either circuit can carry the full load.
Either way it sounds like the 70. Address is your public IP for all intents
and purposes.
Can anyone else with Cox Business Class confirm that? I have only set up
Cox at home for my mom.
Kevin
On Jul 7, 2011 5:24 PM, "lkrawczyk at amhealthgroup.com" <

Cox says that they route the 24. CIDR through the 70. static though so it

sounds like they have already done the routing. Do I need to do something
else? They said I need a special router with 2 WAN ports.
plug-discuss-bounces at lists.plug.phoenix.az.us] On Behalf Of Kevin Fries

Sent: Thursday, July 07, 2011 4:12 PM
To: Main PLUG discussion list
Subject: Re: Cox CIDR block configuration
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?

CIDR is just another way of specifying an ip address. The following two

IP addresses are identical, the only difference is how it is specified. Some
devices prefer one way, other devices prefer the other, and some will take

Address: 123.123.123.112, Subnet Mask: 255.255.255.240
123.123.123.112/28
So, it sounds like you have two network addresses, as 70. address and a

24. address. It sounds like you need to route from one to the other. Is this
correct?

Kevin

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