Yes...m0n0wall should be sufficiant, but you will need to make note of
what filters you have setup on Linksys so that you can duplicate on
m0n0wall. Addiditonally, since you are using Dsl, you will need your
username and password to setup the Dsl connection from m0n0wall.

m0n0wall is both a firewall and a router.

interent--->Dsl Modem---->m0n0---->lan switch---->pc's

~Don