firewall and ip masquerading and dynamic dns

[Noah]

Hi there,

I just built a ubuntu box to provide routing between my internal home 
network and service provider.   I am still a little new to it and would 
like some pointers to getting a

Also I am obtaining my provider interface IP dynamically with dhcp and 
the ip masquerade script I have only has a single definition at the 
top.   Any clues how to get the script to figure my IP at boot time and 
also update the masquerade rules when if my dynamic IP is reassigned?

I want to configure secure dynamic DNS for the machine as well to update 
my name servers when my IP  changes.

I am not interested in packages like guarddog or things that remove me 
from scripts that I can just plop in on my own.  any advice on locating 
good web pages or howtos that can help me here.  Looking forward to 
responses.

Thanks in advance,

Noah

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