everybody can host a game, as long as his router & firewall are well configured (and his ISP doesn't do some specific filtering). It's not related to adsl & dynamic IP.
About markers, it depends of the mode. In Free mode, all are allowed. In Fair mode, only Danger Zone & lower. In Tourney, only Impact Preview, and lower. And your opponent's helper depends of his settings, not yours.
== Mana Games ==
>> I don't answer Private Message, except if it's really a _Private_ topic <<