I have the following packet tracer diagram:
I have range of ip address : 10.0.0.0 - 10.0.255.255 I need to assign ip addresses from this range to the routers' serial interfaces as well as subnet masks. I am not sure what ip's and subnet mask's I should attribute to each of them. Could anyone give me a hand?
I have implemented vlans through the switches and 'router on a stick method' from switch 0 to Campus router. Would this affect the ip addresses I need to use for the serial routing? Thanks.
This answer uses the following assumptions:
To assign IPs to interfaces, a good first step is to assign IP spaces (a range of IP addresses that can be used together) to connections. That means each red line on the diagram gets its own IP space. Since each of the IP spaces we need to allocate has only two interfaces in it (one serial interface on one end, and another on the other), each IP space only needs two usable IP addresses. We should not allocate an IP space that is larger than necessary, since that will take away from the addresses we can use elsewhere in the enterprise. The smallest IP networks that have two usable IP addresses have subnet mask lengths of 30 bits, which is 255.255.255.252 when written out in dotted decimal form.
So, we will create three IP spaces, each with a 30-bit subnet mask. You can start with the lowest addresses in your available range, or the highest, or you can use any pattern that makes sense. For simplicity, I will use the lowest addresses in 10.0.0.0/16 in this example. Three example IP spaces that will work for this are as follows:
Let's use the first space for the Campus to Edge link, the second one for Campus to Elsewhere, and the third from Edge to Elsewhere. Furthermore, suppose the interfaces closer to the top and left of the diagram are the lowest-numbered ones. Here is an example IP address allocation that will work based on the above assumptions:
