Updating linksys wireless firmware
DD-WRT firmware default settings (sometimes called factory defaults) are stored in NVRAM. Flashing with TFTP must not be seen as the standard procedure for flashing: only use it when specifically told to do so (for example in the specific instructions for flashing your brand or type of device).
Normally, the GUI flashing method should be used; this should be adequate for standard situations. If you forgot your username or password, see Factory Defaults, Hard reset or 30/30/30 and Reset And Reboot.
The lease table is cleared when the router is upgraded, unplugged, rebooted, and in situations where a config change requires a reboot.
If your computer is already connected when this happens, it will remain connected but will not be in the lease table until the next time it tries to renew.
There are Wiki pages for Supported Devices and Known incompatible devices. Open VPN support requires routers with at least 8mb flash, and for better speeds use ARM-based routers.
This changes continously, but here are some other good choices (as of Nov 2017): Note: Read the relevant build thread on the forum to determine if that particular build is working.
Use the correct chipset subforum (Broadcom, Atheros, etc.). That thread is Broadcom only, Atheros and other chipsets are on their respective subforums. If you have DD-WRT installed, your router's settings should be accessible by opening a web browser and typing in the address bar.
You may need to use the "Clone MAC Address" feature.
Many Comcast users report needing to use the "Clone MAC Address" feature.
It's just a little different from the way the original Linksys firmware worked.