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I have just received two "3Com Baseline 2924 24 Port Gigabit SFP Plus Switch" units. My concern, having commissioned the first, is the noise level. A fan runs continuously. It's difficult to quantify a noise level, but it's louder than any computer fan I've ever encountered, except when the fan...

I've now found out that the popular term for this is "transparent firewall". Research suggests that the Cisco IOS can do this, but the Cisco PIX cannot. Also that some ZyWall firewalls can do this, and home grown OpenBSD firewalls can.

Maybe I'm asking the wrong question. I'll describe in more detail what I have. I have a single class C range, and all machines are assigned an address in that range, including the router. Currently using a 3Com OfficeConnect Firewall, which takes a single IP address, despite having "in" and...

Thanks for the reply. No, I really do want to add a firewall without having to re-IP anything. In fact, though it shouldn't make a difference, what I want to do is add a second firewall in series, for (a) extra peace of mind coming from using two different manufacturers (b) a recovery plan...

I have used a firewall which can be installed as a "break" within a subnet. It detects which IPs are inside, and which are outside, and bridges between the two. This means a firewall (including a second firewall in series) can be added without disturbing assigned IP addresses. Three questions...