Help subnetting

WingedTek

Hello guys!

I have kind of an odd problem at one of my setups....well its more of a simple question. Will I be able to talk to two different subnets (devices on either side) if one device is set to 192.168.1.100 with a mask of 255.255.255.128 and ones set to 192.168.1.1 with a mask of 255.255.255.0. I would need to have computers from either addresses to talk to each other....

Netstudent

No because those ranges overlap.

You got one range that that goes from 192.168.1.1 - 192.168.1.126

the other range is 192.168.1.1 - 192.168.1.254

so that would not be good.

dtlokee

Looks like you need to re-address the network or use NAT (being the more complex solution). The host addresses you have provided would be on the same network/subnet and therefore won't attempt to transmit to the router.

WingedTek

Would I get conflicts if I had those overlaping yet with those different subnets? They shouldn't even see each out correct?

so what if I make one router as 192.168.2.x 255.255.255.0 and the other 192.168.1.x 255.255.255.128

jediknight

WingedTek wrote:

Would I get conflicts if I had those overlaping yet with those different subnets? They shouldn't even see each out correct?

As mentioned, if you have overlapping addresses it simply would not work. Your hosts would never attempt to send traffic to the router as it would "think" the destination host is on the local subnet. Recall ANDing and this will become very clear.

WingedTek wrote:

so what if I make one router as 192.168.2.x 255.255.255.0 and the other 192.168.1.x 255.255.255.128

This would work as now you have different non-overlapping subnets. Although it's worth mentioning you could use your 192.168.1.x/25 subnet since it already creates 2 subnets if you only need 126 hosts on each subnet; 192.168.1.1-126 and 192.168.1.129-254

WingedTek

jediknight wrote:

WingedTek wrote:

Would I get conflicts if I had those overlaping yet with those different subnets? They shouldn't even see each out correct?

As mentioned, if you have overlapping addresses it simply would not work. Your hosts would never attempt to send traffic to the router as it would "think" the destination host is on the local subnet. Recall ANDing and this will become very clear.

WingedTek wrote:

so what if I make one router as 192.168.2.x 255.255.255.0 and the other 192.168.1.x 255.255.255.128

This would work as now you have different non-overlapping subnets. Although it's worth mentioning you could use your 192.168.1.x/25 subnet since it already creates 2 subnets if you only need 126 hosts on each subnet; 192.168.1.1-126 and 192.168.1.129-254

Well I dont really need to logically seperate the networks only so that they can both talk to each other. Would I be able to use the 255.255.255.0 mask for both addressings?

Netstudent

to be honest man, you need to learn subnetting. It seems like you don;t even have the basics. YOu must at least have basic subnetting down before you start playing with routers or even a SIM. Pretty much everything that has to do with cisco networking involves ip routing and subnetting. That should be the very first thing you learn and become good at.

jediknight

WingedTek wrote:

Well I dont really need to logically seperate the networks only so that they can both talk to each other. Would I be able to use the 255.255.255.0 mask for both addressings?

Yes you could as long as you were using different subnets: 192.168.1.x and 192.168.2.x would work fine with a 255.255.255.0 mask.

jediknight

Netstudent wrote:

to be honest man, you need to learn subnetting. It seems like you don;t even have the basics. YOu must at least have basic subnetting down before you start playing with routers or even a SIM. Pretty much everything that has to do with cisco networking involves ip routing and subnetting. That should be the very first thing you learn and become good at.

I have to agree 100% with this. By the time you start configuring ip routing, you should have a pretty good understanding of ip addressing/subnetting. You don't want to be in the middle of trying to setup a lab and have to not only deal with learning/applying your new learned concepts, but also deal with ip addressing/subnetting.

This is a great site with many well educated people who can help you master the concepts if you ever need help.

WingedTek

Its not that I don't know my basics its more I'm re learning since I don't apply it at a everyday basis since I work as a Technical Manager I dont get to much experience in it. I will be picking it back up in the next week no problem since I need to get ready for my CCNA training.

Netstudent

well good luck with it. We are here to help, so ask as many questions as you need.

WingedTek

Netstudent wrote:

well good luck with it. We are here to help, so ask as many questions as you need.

Thanks mate!