Two Subnets On WAN Port?

Painted_Turtle

How does one configure an ATP with two subnets on the same WAN port?

For customers wanting a static IP block, one of our ISPs (Comcast Cable) provides a cable modem/router which provides two different IP blocks to the customer. One is the public, static, block and the other is a private, block. Typically the private block is DHCP served.

For example, they might give you the following configuration for your public IP if you wanted one public IP:

219.87.158.1 Public IP for your use
219.87.158.2 The public IP of the cable modem/router
255.255.255.252 Subnet Mask

On the same interface port, they would also provide a NATed private block, which is typically something like:

10.1.10.1 cable modem/router
10.1.10.2-10.1.10.254 Range of private IP available for use
255.255.255.0 Subnet Mask

And typically, there is a range of addresses which are DHCP served from this block.

Since they do provide a customer login to their box, and since there is some useful monitoring and troubleshooting information that can be gleaned from it, it is desirable to be able to also connect to the cable box.

Questions:

1. How does one configure an ZyXEL ATP to support this?
2. Is there any kind of standard name for this type of configuration?

jasailafan

You can check if virtual interface is the configuration you need.

Painted_Turtle

Will give it a try. Will we need to make any special routing changes?

jasailafan

It depends on what the scenario is. The configuration example in this discussion may be helpful. 

https://businessforum.zyxel.com/discussion/comment/5295#Comment_5295