#DD WRT CHANGE ROUTER MAC ADDRESS MAC#
While configuring your router for DHCP, you have the ability to enter the MAC addresses of your computers’ network cards and enter which IP address to assign them. This amazing custom router firmware has a solution to this mess: static DHCP, also known as DHCP reservation. We’ve touted DD-WRT’s ability many times before, and it’s not for nothing. You can do this on plenty of modern routers, but we’re going to use DD-WRT for this guide. With IP addresses changing, you have to reconfigure your port forwarding settings often, otherwise you may lose the ability to connect to your home computers. Tons of older routers don’t even have this ability, and immediately assign new IP addresses. Often, though, a router reset will wipe this cache and start assigning IPs on a first-come, first-served basis. Newer routers often have the ability to remember which IP address was assigned to which computer, so if they disconnect and reconnect their IP doesn’t change. Many programs try to get around this fact by offering Universal Plug and Play (UPnP) port forwarding features, but not everything does. If your router changes the IP that is assigned to a machine by DHCP, then you have to reconfigure Port Forwarding. The problem is that these two wonderful things rely on one premise: your internal IP addresses don’t change. Port forwarding is useful because you can access your router from outside of your network and be redirected to the computer you need inside of your network. You configure your router to automatically assign IP addresses and the computers on your network just plain work. This was a Linksys WRT54G that had just been reset and had not had any changes made to it yet.The Problem with DHCP and Port ForwardingĭHCP is great. I've changed the MAC addresses for security reasons. Every other avenue of unbricking should be tried multiple times before resorting to this.įor future reference, I'm providing a list of factory defaults in DD-WRT v23 SP2. VERY DANGEROUS! You can physically damage the flash memory chip and TRULY "brick" an otherwise working piece of hardware this way. There are ways to physically short certain pins/traces inside the router in order to reset the NVRAM. On some less-supported hardware this may have unpleasant results. Some platforms will completely empty the NVRAM and depend on another stage of the bootloader or firmware to repopulate it.
Here the bootloader is in charge, so getting it to clear the memory for you may have different results. Holding down the reset-button while plugging in the router achieves a different goal. If you added new non-factory variables, they should still be there after this type of reset. What it is supposed to do is return all settings to factory state. Many people think of it and phrase it that way. Normal behavior here is for it to not actually clear the NVRAM. Wait for it to return to normal operation (typically power-LED on solid). On different models you may see rapid flashing of a LED, or a red error or diagnostic LED. Press and hold the button while the router is on, and keep holding it about 30 seconds. Under Administration -> Factory Defaults Via the reset button on the router Here are the ways that you can Reset to Factory Defaults. NOTE: This will not restore firmware to a previous state, it only clears the settings. Again, do not restore setting backups from previous versions as mentioned in the forum. Because of this, you should only use this feature to restore settings on the same router with the same firmware version. When you use the DD-WRT Web GUI to save your settings to a file, you are dumping the NVRAM settings to a binary file. In the best case scenario, Firmware B will just throw an error and gracefully continue booting, but there could be cases where it errors out so badly that it bricks the router or makes it unbootable.
Firmware B expects a boolean value here, such as "1" or "0". Now, let's flash the router with Firmware B, which reads the run_masq variable determine whether the router does masquerading. It is necessary to reset the NVRAM between flashes so that the new firmware encounters known values in the NVRAM.įor example, let's say that Firmware A sets the imaginary variable run_masq to "/usr/bin/masqrun", and this command is run at startup. The NVRAM is also retained between flashes of different firmware versions or even different firmware versions! NVRAM Merge needed with Hardware#NVRAM.Įvery router has a memory chip inside that stores persistent settings between reboots.
0 kommentar(er)
