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Re: DHCP and PPP



On Apr 6, 2005 3:00 PM, Henry Hartley <henryhartley westat com> wrote:
> On Wed, 06 Apr 2005 at 12:43 PM David Hoffman said:
> This turns out to have been much easier than I expected.  First, put
> the private IP address in /etc/hosts
> 
>        192.168.0.2 ppp1
> 
> Then, make sure /etc/ppp/options.ttyS0 has this in it (with the real
> domain name):
> 
>        mydomain.com:ppp1
> 
> Finally, be sure iptables will not get in the way with this section:
> 
>        # nat the private network addresses used for dhcp
>        *nat
>        :PREROUTING ACCEPT [566:30646]
>        :POSTROUTING ACCEPT [799:50552]
>        :OUTPUT ACCEPT [799:50552]
>        -A POSTROUTING -s 192.168.0.0/255.255.255.0 -j MASQUERADE
>        COMMIT
> 
> and of course reload the running iptables with:
> 
>        iptables-restore /etc/sysconfig/iptables
> 
> And it works.  I don't need DHCP at all, it seems.  Okay, I admit, I


There you go... that pretty much covers the details of the steps that
I was talking about. Using MASQUERADE sets up NAT routing to the new
private subnet, and your dial-up users will get a 192.168.x.x address
instead of a real address.

Sounds like you have it working.


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