What are Subnet Mask and Gateway exactly

Posted by Saif Bechan on Server Fault See other posts from Server Fault or by Saif Bechan
Published on 2010-03-29T05:59:44Z Indexed on 2010/03/29 6:03 UTC
Read the original article Hit count: 619

Filed under:

subnet-mask

|

gateway

|

ip

|

what-is

I have a dedicated server with multiple IP adresses. I run them on Plesk but some of the names are confusing me.

One ip has a subnet mask of 225.225.225.192, another has 225.225.225.0. What does this mean and what happens if i change that.

Another thing i got a gateway. What is that and when will that come in handy.

Another thing I see sometimes behind the ip's is /number. For example:

200.20.20.20/24
200.20.20.20/16
200.20.20.20/8

What will these numbers say.

© Server Fault or respective owner

Related posts about subnet-mask

VPN with wrong subnet mask

as seen on Server Fault - Search for 'Server Fault'
I followed these instructions on www.hottonetworking.com to set up VPN on a clean install of Windows Server 2008 SP2 (not R2 yet). When I then establish a VPN connection to that machine from a client machine (running Windows 7 RC), everything succeeds (it seems since I get a 'Connected' state in… >>> More
What are Subnet Mask and Gateway exactly

as seen on Server Fault - Search for 'Server Fault'
I have a dedicated server with multiple IP adresses. I run them on Plesk but some of the names are confusing me. One ip has a subnet mask of 225.225.225.192, another has 225.225.225.0. What does this mean and what happens if i change that. Another thing i got a gateway. What is that and when will… >>> More
Windows Server 2008: specifying the default IP address when NIC has multiple addresses

as seen on Server Fault - Search for 'Server Fault'
I have a Windows Server which has ~10 IP addresses statically bound. The problem is I don't know how to specify the default IP address. Sometimes when I assign a new address to the NIC, the default IP address changes with the last IP entered in the advanced IP configuration on the NIC. This has the… >>> More
to get the list of hostname, IP address, subnet mask

as seen on Server Fault - Search for 'Server Fault'
want to write a Vb Script to get the full information on all the host name, and ip address and sub net mask of computer that has been added to the domain control. >>> More
Calculate broadcast address from ip and subnet mask

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi I want to calculate the broadcast address for e.g -IP 192.168.3.1 -Subnet 255.255.255.0 =192.168.3.255 in C. I know the way (doing fancy bitwise OR's between the inversed IP and Subnet), but my problem is I come from the green fields of MacOSX Cocoa programing. I looked into the source of ipcal… >>> More

Related posts about gateway

Gateway IP for eth0 and gateway IP for pptp vpn are same

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
My problem is.. 1) I'm using laptop at school. 2) In school, the default gateway for ethernet is 192.168.1.1. 3) I want to connect to a pptp vpn server. The gateway over the vpn connection is also 192.68.1.1. (The VPN server assigns 192.168.100.1 to my laptop and I confirmed that it is not used in… >>> More
Accessing two networks connected to gateway from behind the gateway

as seen on Super User - Search for 'Super User'
I have a Windows XP machine acting as internet gateway. It is connected to two different networks, one, say LAN1, connects to internet and other, say LAN2, to outside LAN. My machine is sitting behind the gateway. I have set up internet connection sharing on LAN1 and can access internet on my machine… >>> More
2 VB Scripts one to remove Default Gateway and one to add a Default Gateway

as seen on Server Fault - Search for 'Server Fault'
Hello everyone, I have a client with a bunch of children using about 30 machines on a regular basis. All machines that the children user are set with Static IP Addresses. The machines that the kids use, I would like to be able to run a script that will remove the default gateway so they cant get… >>> More
Windows 7 DHCP Default Gateway not Overridden by manual Default Gateway

as seen on Super User - Search for 'Super User'
We have recently installed Windows 7 for student computers. All student computers must be routed through our content filter which is located at 192.168.0.63. This was done in WinXP by adding a Default Gateway in the network adapter settings TCP/IP Properties Advanced Default Gateway. All teacher… >>> More
Windows 7 DHCP Default Gateway not Overridden by manual Default Gateway

as seen on Server Fault - Search for 'Server Fault'
We have recently installed Windows 7 for student computers. All student computers must be routed through our content filter which is located at 192.168.0.63. This was done in WinXP by adding a Default Gateway in the network adapter settings TCP/IP Properties Advanced Default Gateway. All teacher… >>> More