I finally got the DD-WRT firmware working on my Fonera 2100. I had been trying to get it up and running for a while, but couldn’t get it to work. Apparently the current “stable” release of DD-WRT, v24 SP1 doesn’t want to boot. As soon as I finished the installation in RedBoot and ran “reset” the Fonera stopped responding. Today I tried the current “unstable” release of DD-WRT, v24 preSP2 (build 11522) and it booted right away!
So far I’ve been able to get client-mode to work. Next step: client bridge-mode!