I have a cable modem that has an internal 192.168.100.1.  It is hooked 
to the ISP and gets a public address which it passes to my LRP eth0.  I 
have dhcpd running on eth1 to my internal Eigerstein 192.168.1.x.  It's 
a surfboard 4100 modem w/an internal status page.

Now, I want to be able to look at the surfboard modems status page 
192.168.100.1 from my eth1 internal 192.168.1.x, but I don't want to 
open my router to the work for 192.168.x.x.  I want to put in a rule 
that will take an HTTP source of 192.168.1.x on eth1 and pass that 
through eth0 to 192.168.100.1.  This should work because when I hook a 
laptop directly to the modem, I can http://192.168.100.1 and see the 
page.  Of course, I don't want eth0 the take in 192.168.x.x from the 
outside or break any other router RFC's.

I've mucked about with it and am getting frustrated.  I'm pretty sure I 
need to masq between the two interfaces, but I can't get it right 
without being wide open on 192.168.100 on all ports, all protocols.

can any of you ipchains experts help?

thanks.
mike.




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