Earlier quoted context omitted.
Thank you for the info - do you know if there's an ADSL modem that's good for DD-WRT these days? Last I looked (yeeeaaaars ago) there were only two models, long since out of production, and they didn't seem to be going in that direction anymore.
Why would you run linux on your modem? Unless its a hybrid modem/router.
Cable companies might still ship modems (they did the last time I had cable internet, but that was probably 8 years ago).