[lug] DSL question

[Chip Atkinson]

On the 675, you can do NAT on a whole address range. You don't have to
have one machine be a gateway, the 675 will do fine.  I have two boxes
connected to a hub that is also connected to the 675.  The 675 is 10.0.0.1
and the other machines are 10.0.0.5 and 10.0.0.2.  I have the dhcp server
turned off on the 675 and statically assigned the addresses to this
address range.  NAT is working just fine in this setup.  The 675 has DHCP
client turned on so that it gets the dynamic IP from my ISP on the WAN
end.  I never really had to screw with DHCP on the home (linux) end at
all.

Chip

On Sun, 23 Apr 2000, PC Drew wrote:

> 
> Thus spake Justin on Saturday, April 22, 2000, 7:42:28 PM:
> 
> J> Hi, I finally got DSL available in my area and have it setup to start on the
> J> 2nd of the month. I have service with Uswest and I am using a Cisco 675
> J> external modem. My isp uses the PPP mode with DSL, how does that work exactly?
<SNIP> 
> Actually, no. You plug the DSL router into a hub or switch and start
> NAT on the router.  Then, you setup each one of your machines to have
> a gateway of 10.0.0.1 and start giving out IP addresses after that one
> (i.e. 10.0.0.2, 10.0.0.3, etc).  If you don't want to do that, you can
> start the DHCP service on the DSL router and each machine will
> configure its own IP address.
> 
> Now what you've got is a whole network of computers masquerading as
> one IP address when it goes out through your DSL router.  Using NAT
> (Network Address Translation), your non-routable IP address of
> 10.0.0.2 gets translated to something like: 12.13.14.15:32402
> (assuming 12.13.14.15 is your IP address, then the 32402 is a random
> port number) and then everything works fine.
> 
> 
> 
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