Hey Nachi, 2.Interface of firewall.py This is my proposal of firewall.py firewall.py https://github.com/nttmcl/quantum/commit/4987b0ade5e130a38a397c40a81a9ddcfee1bf7a That's fine, but it's an interface - what firewall rules are you going to apply, precisely? This is quite important, I'm not convinced that the current firewalling always applies the same things and I'm sure it implicitly applies rules that the security groups themselves don't specify. I don't want to go down that same path again, which means documenting the operation is important, perhaps more important than coding it. -- Ian.