I'm running an identical setup here - a Cisco 827, a /29, and a FreeBSD machine (or two) performing NAT for my LAN.I have a friend with a cisco 827 adsl router. It has config hassles but when that is sorted, we need to setup a freebsd box inside the cisco router to handle a /29 block of ips. 3 questions...
The Cisco will be "adequate," but I prefer the ease of use and added functions a FreeBSD machine running IP Filter/IPNAT, but that's just me.a) Should I assume the cisco is not the worlds greatest firewall and setup the freebsd machine as one (creating a dmz)
I have my 827 set up as a very basic bridge. This means that instead of the /29 "terminating," so to speak, on the 827, each of my allocated IP addresses is available directly on an ethernet interface on one of two FreeBSD machines.b) The /29 block is routed by the ISP to the cisco device. I guess we need to place a static route on the cisco gadget that directs any of the incoming /29 block request onto the freebsd box...Correct?
As a partial answer to part C, if you bridge the /29 to the FreeBSD machine, you can easily configure IPF and IPNAT to port-forward to various internet servers as required. Personally, the machine I have performing NAT (with my /29 on one interface and a private /24 on the other) for my internal network also runs various services. It's not an ideal setup, but it is functional and easy to maintain.
Sorry I can't answer the rest of your questions, my brain is still enjoying the aftereffects of a big Friday night :)
--Steven
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