IP addressing and subnets

DCVink · 03-03-2008, 04:34 AM

Hi,

I have a strange problem. I have a intern network. All addresses are 10.0.x.x and the gateway is 10.0.0.1. All with subnetmask 255.255.248.0
In this way I could go to 10.0.7.254 with the ip-addresses for the clients. But, this is not enough anymore .....

I changed the subnetmask to 255.255.240.0 with the thought I could go to 10.0.15.254. But, there is a problem. First I forgot to change the subnetmask of the gateway. So, the client with ip-addresses 10.0.8.x and higher couldn't get out to the internet. Ok, my fault.
Now I changed the subnetmask of the gateway to 255.255.240.0 and guess what? No internet at all at any client.
Is there someone who can explain this to me?

eduperson · 03-03-2008, 02:41 PM

Have you tried restarting your gateway? And any infrastructure switches?

DCVink · 03-04-2008, 12:42 AM

I have restarted the network of the gateway. It's linux, so that should be enough. But tonight I will try it again, and then restart the machine.

Any other suggestions are more then welcome.

03-03-2008, 04:34 AM	#1 (permalink)
DCVink Registered User Join Date: Mar 2008 Posts: 2 OS: Windows Vista	IP addressing and subnets Hi, I have a strange problem. I have a intern network. All addresses are 10.0.x.x and the gateway is 10.0.0.1. All with subnetmask 255.255.248.0 In this way I could go to 10.0.7.254 with the ip-addresses for the clients. But, this is not enough anymore ..... I changed the subnetmask to 255.255.240.0 with the thought I could go to 10.0.15.254. But, there is a problem. First I forgot to change the subnetmask of the gateway. So, the client with ip-addresses 10.0.8.x and higher couldn't get out to the internet. Ok, my fault. Now I changed the subnetmask of the gateway to 255.255.240.0 and guess what? No internet at all at any client. Is there someone who can explain this to me? Last edited by DCVink : 03-03-2008 at 04:41 AM.

03-03-2008, 02:41 PM	#2 (permalink)
eduperson Registered User Join Date: Feb 2008 Location: London, U.K. Posts: 12 OS: XP SP2	Re: IP addressing and subnets Have you tried restarting your gateway? And any infrastructure switches?

03-04-2008, 12:42 AM	#3 (permalink)
DCVink Registered User Join Date: Mar 2008 Posts: 2 OS: Windows Vista	Re: IP addressing and subnets I have restarted the network of the gateway. It's linux, so that should be enough. But tonight I will try it again, and then restart the machine. Any other suggestions are more then welcome.