Routing problem.. cisco -->fbsd-->Lan Experts??

[Steven Wiltshire]

keith at smmc.qld.edu.au wrote:

>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...
>
I'm running an identical setup here - a Cisco 827, a /29, and a FreeBSD 
machine (or two) performing NAT for my LAN.

>a) Should I assume the cisco is not the worlds greatest firewall and setup
>the freebsd machine as one (creating a dmz)
>
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.

>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?
>
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.

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