Ed, This is very interesting information. I have a couple of additional questions that you may be able to help me with that I think are applicable to this thread. Please see below: > ---------- Forwarded message ---------- > From: Ed Greshko <Ed.Greshko@xxxxxxxxxxx> > To: Community support for Fedora users <users@xxxxxxxxxxxxxxxxxxxxxxx> > Date: Fri, 17 Jun 2011 06:48:02 +0800 > Subject: Re: Two elementary questions on LANs > Some additional information regarding DHCP..... > > As I mentioned, the lease information is retained by both the client and > the server..... > > Let's assume that this is not the first time the client has acquired an > IP address from the server. Let's also assume that the interface is > currently down and a file exists in /var/lib/dhcpclient for the > interface in question. > > Now, you enable the interface and the following happens.... > > 1. The dhcpclient checks the file to see what IP address it was last > assigned. > > 2. The client then sends out a UDP broadcast with source address of > 0.0.0.0 and destination of 255.255.255.255 (a broadcast request) It > will be a message type of DHCP Request and the packet will contain the > previous IP address it is requesting. It will also have a "transaction > ID" in the packet. > I have desktops and laptops on my local LAN that each dual-boot with F15 and Windows and each have a wired and wireless LAN connection. My router acts as the DHCP Server but doesn't have the capability to assign a pre-defined IP address to each machine based on its MAC address. Besides, I would like each machine to have a different address assigned depending on whether it was running Fedora or Windows in a given instance. I don't want to assign fixed IP addresses to the clients - I want them to get the addresses from the server so that they don't have to be reconfigured if they go off of my LAN and onto another (e.g., the laptops). But I would like to set them up to each request a unique IP address from the server and to identify themselves differently depending on whether it is the wired or wireless connection such that they are very likely to get what they request. (The reason I want this IP address stability is because I use Backuppc to back each up and now the volatility of their IP addresses is making it so that that doesn't work too well. The volatility is caused by other more transient devices getting on and off the network and causing the reassignment of previously assigned addresses to not occur very often.) > 3. The server will respond. The source address will be its IP address > and the destination will be 255.255.255.255 Another broadcast. The > response will have the same "transaction ID" as the request and the > client will match these to know the broadcast message is meant for it. > > You are done.... > > If a file in /var/lib/dhcpclient does not exist for the interface the > procedure is a bit different.... > If this file does exist, can I simply edit it to put the IP address I want assigned to each LAN interface of each machine into it and thus achieve what I want? Can I simply put in a different 'option host-name' value into the wired vs. wireless files in this directory to achieve my goal of distinguishing them (e.g., HPfedora vs. HPfedora-wl) for a given machine or OS (e.g., HPVista vs. HPVista-wl)? Or are there other configuration files where I should put this information that will cause the client to send out the DHCP Request with the IP address and host-names that I want? I would be grateful for your comments. Alex -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
