I called Aliant who are my service provider and they told me my 6520 Sieman router does not have any type of fire wall , I was wondering this as the other 2 computers that my son's have are using this same router , they are having no problems using LW. the only difference is that they are using XP and I am using Vista. When I looked at my router it did not match the Router that I was seeing following the link provided.