-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Robert P. J. Day wrote: | On Wed, 5 Mar 2008, Antoine Martin wrote: | |> Well, the problem is that if you don't want to use dhcp, you either have |> to edit some config files on the guest or you have to login and bring |> the network up by hand... |> IMO, that's more complicated (and less flexible) than just starting a |> dhcp server instance. |> |> Antoine | | i know what you're talking about here -- at least, let me make sure | i do. | | at the moment, my host system is 192.168.1.2 on the local home | network (router/gateway at 192.168.1.1). if i was setting up UML | networking *properly*, i'd allocate a new network exclusively for all | of my UML guests -- say 10.0.0.0. and i'd set up a DHCP server on my | host that would hand out 10.x.x.x addresses to my UML sessions. i'd | also have to have the host doing NAT to allow those UML sessions | access to the internet, etc, etc. i believe that's what you're | describing at the bottom of the page here, yes? | | http://uml.nagafix.co.uk/ | | however, if i have just the one UML session and i just want some | quick networking, i can do something much faster and uglier, and steal | IP addresses from my current physical network so that i'll have the | following tuntap connection between my host and guest: | | host <----------> UML | | 192.168.1.254 192.168.1.253 | | then, in the UML session, i can make 192.168.1.254 my default gateway, | and i can set up my host to forward IP packets. (all of that requires | manually configuring the UML session, including hard-coding the DNS | server, which would be 192.168.1.1, my router.) | | the above hack does work, but it's admittedly, you know, hacky. and | it certainly doesn't scale well if i want to start supporting multiple | guest UML sessions. | | so, just to make sure i understand, yes, DHCP would clearly be a | cleaner approach, but it *would* involve allocating a new network to | my UML sessions No it does not. You can bind the dhcp server to a specific network interface and make it serve any IP address you like.
Using dhcp, you can do all this *without* logging into the guest via the console - no interaction needed. So you can even have the guest start ssh and connect via the network. Cheers Antoine | -- i wouldn't want to have my local network with an | address of 192.168.1.0 and also be giving out DHCP addresses of the | same form to my UML sessions, would i? (it's possible to do that, of | course, but it would be ugly.) | | do i understand this even remotely? | | rday | | p.s. this *appears* to be what you're doing in your setup at the | bottom of that web page again. i note that, when you start a UML | session, you assign the host eth0 an address of 192.168.1.254, which | suggests your local (physical) network is 192.168.1.0 (which is pretty | standard). | | but your DHCP server is handing out addresses of the form 192.168.0.x, | so that seems to agree with what i wrote above -- you've assigned an | entirely separate class C net for your UML sessions; hence the need | for NAT and MASQUERADE and so on on the host side. | -- | | ======================================================================== | Robert P. J. Day | Linux Consulting, Training and Annoying Kernel Pedantry: | Have classroom, will lecture. | | http://crashcourse.ca Waterloo, Ontario, CANADA | ======================================================================== | -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.7 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFH0HmLGK2zHPGK1rsRCp4lAJ95ql0JgLrL6DQ200RobNrl6RJstwCfR4el xl4nL0mf78jW3+EGutIKqo0= =w5r6 -----END PGP SIGNATURE----- ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
