On Wed, 06 Apr 2005 at 12:43 PM David Hoffman said: >> >> On Apr 6, 2005 11:34 AM, Henry Hartley wrote: >> > As of this week, I'm on a cheaper circuit without any spare IP >> > addresses. The former users all were getting broadband so it >> > wasn't suppose to matter but my parents order for broadband is >> > taking longer than expected. I'd like to give them their ppp >> > back until Verizon gets things set up but don't know how to set >> > it up so that dhcp can assign a private IP address to the modem. >> > Can anyone here point me to documentation that will help me with >> > this? >> > >> > I've configured a simple DHCP server before but it didn't involve >> > ppp and I don't really know where to start. Any help you can >> > provide would be greatly appreciated. >> >> It sounds like what you need to do is create your new IP Addresses >> on a private (192.168.x.x) network, and then set your system to use >> NAT to allow the traffic to pass. That way you don't have to depend >> on other existing IP Addresses, and your machine can route the >> traffic through using NAT. I know there is information at TLDP.org >> with how-to's on setting up Masquerading (NAT) and PPP, but I don't >> recall actual links right now. 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 didn't figure this out on my own. Thanks to Amy Alford for her brilliant and timely help. -- Henry
