be reachable on the same IP address on the local network.?

Question

Hello ,

how to be always be reachable on the same IP address on the local network. It is important that it does not conflict with existing addresses or addresses
being automatically assigned by the DHCP server. Assign the machine a static ip not a part of the network's DHCP pool.

and by DHCP pool , what does it mean ?

Answer 1

All home routers have a DHCP server, with a range of LAN IP addresses to give out to all machines that connect to the router. However, one can set the range of IP for the DHCP. For example, if the router is at 192.168.1.1, the DHCP pool can be set to something like 192.168.1.100 to 192.168.1.200.

That then allows one to set their PC to a static IP address outside of this DHCP pool range. Typical example would be 192.168.1.50. Once set in a PC, that PC will always have that IP address, and all machines on the LAN using DHCP will get an IP in the range of .100 to .200

Thus, the static LAN IP is outside the range of the DHCP server pool. One can set the DHCP to other range of numbers within the LAN, and leave some addresses outside to allow static IP to be set on selected machines. It is all up the the router administrator to set these ranges and static values.



Some routers, by default, use the entire remaining LAN IP values as a pool range, for example 192.168.1.2 to 192.168.1.254. That range has to be reduced to smaller values if anyone plans to use a static LAN IP on that network, the router is hogging all the IP....

Answer 2

You can only do this if either you control the router/DHCP or you know which range of IP addresses DHCP can allocate.



Most routers come preconfigured to allocate the whole range of IP addresses via DHCP, which is daft!



Log in to the router's web interface (using the admin ID and Password that is usually on a label behind or under the router.

Select the DHCP server settings

Set the available DHCP range to a much more limited number of addresses - I use 192.168.x.240 to 192.168.x.250 (which gives up to 20 addresses available for simultaneous DHCP allocation).

Use addresses from 192.168.x.2 up to 192.168.x.239 for your static devices.



As a general rule, only use DHCP for devices such as laptops, tablets and phones that move around from one network to another. Desktop computers, printers, backup disk drives, etc which don't move around should have fixed IP addresses and preferably be connected by ethernet cables rather than WiFi for more reliable and faster links.



If you do not have control of the router then you need to ask whoever does, what range of fixed addresses is available and ask for one to be reserved for your device.

Answer 3

it is not possible. ip address is unique address.only one computer should have unique ip.

Answer 4

Fairly easy, I would not bother with Windows or any other OS you are using.



For home routers, most DHCP servers have static mapping, that's not part of DHCP pool that's why you con't see it, that's the easiest way if DHCP is set; that means if a certain MAC address comes calling for DHCP assigned IP, then a certain IP is sent to it everytime. That's reservation.



DHCP pool is the range of addresses ready to be given out as DHCP assigned IP.



This next way involves constricting DHCP pool, and run static IP off on each machine, I haven't done static IP for ages.

Answer 5

There are three different ways that addresses can be defined: dynamic, static and reserved.



With a dynamic address a device connecting to the network broadcasts a request using the Dynamic Host Control Protocol (DHCP) for an address to be assigned to it. Such a broadcast is normally valid only on the current subnet, which for home networks will be all your devices plus the router. Home routers have their DHCP service (enabled by default), which is assigned a range of addresses within the subnet. When it receives a DHCP request, first it checks whether there is still an address allocated to that device. If there is, the details of that address are sent to the device. If there is not, then the service will look through the assigned range of addresses it can use, and if one is free it will be allocated to the device and send the relevant details. One of the parameters that is sent defines how long the allocation will remain valid. Once half the time has expired, the device can request a renewal (extension of the time) and keep the same address. If the time expires because the device is offline, then the allocation expires.



Static addresses are configured in the actual device(s), and should avoid any addresses assigned to the DHCP service. The range of such addresses can be adjusted if necessary within the router. It must also avoid any addresses that have been assigned as static addresses to other devices including the router. If a device is given a static address in the DHCP address range, and the router has assigned that address to another device before the device using that (static) address comes on line, then there can be two devices on the same address and they will have problems using the network.



The third case - reserved address - is a setting available in some routers. This normally involves an address in the range of addresses used by the DHCP service, but the setting effectively reserves the chosen address for the one specific device and will not allocate it to any other device. Unlike using a static address, the device is still obtaining its address by DHCP. This has an advantage for Ethernet connections, and also because of a quirk in Windows for WiFi connections as well. If a Windows PC has a static address configured and it is connected to a different network, typical for a Windows laptop that is used on different WiFi networks, the static address settings may be incompatible with the subnet of a different WiFi network and it is necessary to change the laptop's settings when it connects to one of these other networks. By using a reservation in the router, the device will get the one fixed address on this specific network but can be assigned different addresses when connected on other networks.



This problem mainly affects Ethernet and Windows WiFi. For other devices such as Android, the WiFi address settings in the device relate to the specific network to which it is connected so one WiFi network can have static addressing while a different network uses dynamic addressing. Windows stupidly has the address settings tied to the specific WiFi adapter and not the actual WiFi network, so a static address setting will apply to all WiFi networks and may need to be changed to connect to a different network.



I hope this helps.

Answer 6

There is an excellent guide for Windows 10 on setting a "static" IP... it also explains "Dynamic" (DHCP) vs Static addresses

https://portforward.com/networking/static-ip-windows-10.htm



As far as having to use netsh -- it is a bad idea unless you fully understand networking and windows. Setting Static DNS in order to use a static IP is NOT necessary at all. DNS can still be DHCP even with a static set IP for your computer!



PS - Some routers will even allow you to assign a "reserved" address for your computer. (Basically the same thing as a static IP used within the DHCP system!)

Answer 7

This is fairly easy.  While you're connected to the router, open an elevated command prompt, then type IPCONFIG amd press Enter.  Note the exact name of the network adapter connecting to the router (i.e., "local area connection", "wireless network connection"), the IP address, the subnet mask, and the default gateway.



Type NETSH INT IP SHOW DNS and press Enter.  Note the DNS server address(es).



Type this command, making the appropriate substitutions, and press Enter (do not omit the quotes).



NETSH INT IP SET ADDRESS "network_adapter" STATIC ip_address subnet_mask default_gateway 0



Type this command, substituting the first (or only) DNS server address.



NETSH INT IP SET ADDRESS "network_adapter" STATIC dns_server NONE



If there is a second DNS server address, set it with



NETSH INT IP ADD DNS "network_adapter" 2nd_dns 2

Answer 8

This is much easier when people specify the make & model of their router. It allows us to find the User Manual that goes with your router and see if it has the functionality you need, or whether you'll need to make the necessary changes by hand.

Answer 9

For the most part, a DHCP server will usually give back the exact same IP address to a device that it's seen has had it before. If new devices come in, then they will be assigned other IP addresses before they get addressed the same address that was assigned to your device first.



However, if you want to formalize this procedure, you can assign what are known as "static" DHCP addresses (a bit of an oxymoron, as that means "static Dynamic Host Control Protocol", so it's both static and dynamic). Go into your router's internal interface and see if it has a static addresses setting, and set your machine's MAC address with that IP address forever.

Answer 10

DHCP is a protocal used to automatically assign an IP address, DNS and other configuration settings to client machines when they connect to a LAN segment. Addresses are assinged from a pool or range of addresses that the server manages. Addresses that fall outside of that range can be assigned statically (manually) to a client without causing an address conflict with DHCP clients. You can also create a DHCP reservation using the client machine's hardware MAC address so that it always receives the same address from your DHCP server but still allow you to autoconfigure other parameters on a case by case basis.



https://www.youtube.com/watch?time_continue=51&v=gQdxxckMD4I