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255 255 255 0 dns full#

So, the three decisions mentioned above (and detailed below) are best done early in the game. The downside to configuring IP addresses and subnets is that a mistake can totally screw things up. For more on this, see my September 2020īlog A second router can make working from home much more secure. The other is carve out a secluded section within your home for devices involved in working from home. The first is to make some initial configuration changes to a new router, as I suggest on the new router page. And, should you ever want, or need, to plug one router into another router, it will not work well if each router uses the same subnet.įYI: There are two reasons to plug one router into another. If, someday in the future, you setup a site to site VPN, having each site use its own subnet is cleaner and easier. Using a subnet that is off the beaten path can also come in handy for VPNs. Also, some devices on the Local Area Network work best with a static/permanent IP address and the defaults for your router may not allow for any static IP addresses. This is because some malware targets routers by their default IP address. Dealing with IP addresses and subnets is optional, but recommended for a few reasons.įor one, you will be a bit safer by not using the defaults. Note that DHCP reservation can be used to give out any IP address in the subnet (other than the one used by the router).Įvery router has default values for the three decisions above and the defaults will, of course, work. This, in turn, determines the IP addresses that can be permanently/statically assigned.

Decide which IP addresses within the subnet will be given out on a dynamic (on-demand) basis to devices that connect to the router.

Assign a fixed IP address within the subnet to the router.

255 255 255 0 dns full#

Pick a subnet (the full range of allowable IP addresses).These are the decisions that need to be made regarding LAN side IP addresses: If the static IP address is not in the correct sub-network, hair will be pulled out. The opposite of Dynamic, this is referred to as a static IP address.

That is, it never asks the router for an IP address.

The least popular method is for a device to be configured to use the same IP address all the time.

A common term for this is DHCP reservation.

A slight variation on this also uses DHCP, but the router will always give the same device the same IP address, over and over and over and over.

A device typically uses an IP address for a day and then asks the router for another one, but the router can control this. This is referred to as DHCP, where the D stands for dynamic, as in the IP address is dynamically assigned when requested.

The most common is that they ask the router to assign them an IP address when they first connect to the router.

This is often written as 192.168.1.x where the x is a placeholder for all the possible numbers in the fourth position (0 to 255).ĭevices that connect to the router get assigned a LAN side IP address in one of three ways. A very common subnet (range of numbers) is the numbers that start with 192.168.1 and only vary in the fourth/last number. The range of allowable LAN side IP addresses is called a subnet (as in sub-network, as in, only use these few numbers of all the billions of possible numbers). LAN or Local Area Network side) IP addresses, both for itself and for all the computing devices that connect to it. The public IP address is not a secret and there are many websites that display it (, and In contrast, the router has total control over the private side (a.k.a. The router has no control over the public IP address, it is assigned by the ISP (Comcast, Verizon, Spectrum, etc.). The public side is also referred to as the WAN or Wide Area Network side of the router.

The public side of a router is visible on the Internet. Routers differ from other computing devices in that they have (at least) two IP address: a public one and a private one. A common IP address is 192.168.1.1.Įach number can, technically, range from zero to 255. The unique numbers are called IP addresses and theyĪre written as four decimal numbers separated by periods (rather than commas). And, by "computer," I mean any computingĭevice (phones, tablets, ROKU boxes, routers, Amazon Echos etc.). As you would expect, every computer on a network has a unique number.