Add firewall and linkdelay support.
Firewall support is preliminary and is relevant to XEN containers only. A suitable rspec fragment for your node is: <emulab:firewall style=closed'> <emulab:exception port='80' direction='incoming' ip='myip'/> </emulab:firewall> won't bother to explain, its obvious and going to change pretty quickly. Well, I should mention that "myip" means to replace the ip with the ip address of the caller. Linkedelay support allows passing through basic Emulab traffic shaping parameters, in a linkdelay only configuration.
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