I've setup a DHCP connected linux box.  It runs Shorewall.

[net]
  |
------------------------
EXT: DHCP Client
 Uverse/ATT modem (bridge mode)
INT: DHCP Server & WebServer @ http://192.168.1.254
------------------------
  |
  |
------------------------
EXT: DHCP Client -> IP == 1.2.3.4
 Linux Router/Firewall (shorewall)
INT: 192.168.1.100
------------------------
  |
  |-------------------------------|
-------------------     -------------------
EXT: 192.168.1.10       EXT: 192.168.1.20
 Linux Laptop            Linux MailServer (temp)
-------------------     -------------------

Shorewall's config'd to allow in-/out-bound traffic between the LAN and the 
'net.  It works as intended -- Laptop & MailServer are both net-functional.

What I haven't managed to do, is access the modem's WebServer @ 
http://192.168.1.254 from the LAN.  If the Laptop's directly connected to the 
Modem, without the Shorewall instance in between, no problem.

I need to punch a hole with Shorewall to allow only LAN access to the modem's 
WebServer on the 192.168.1.0/24 segment, and no further.

How do I properly allow that traffic, on a 'private' address segment, in/out 
the SW external address?  Do I need to also assign a 192.168.1.X addr too the 
SW ext intfc?

To date, I've typically config'd with private addresses NEVER being routed on 
the SW external interface.  Not sure if it's either possible or recommended.

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