>> > properly for connecting to a UML instance. (Network access from > >> > the UML machine to the outside world works fine, it's just the > >> > incoming connections that fail.)
I think there must be a mistake here, a TCP or UDP connection can only be initiated from the UML machine to the outside, slirp translates this connection to the outside world. It is not possible for slirp to know on which UDP/TCP ports the UML machine is waiting, so it is not possible to get incoming TCP/UDP connections with slirp. But when a connection comes from the UML machine, slirp opens a socket to the outside, that opens the return port for the incoming data. Here is an example for the udp dns and slirp: UML produces an udp dns request for what UML believes is the dns server, but is really the slirp inside addresse, slirp catches it and replaces the destination addresse with the real dns server adresse found in the file /etc/resolv.conf. When the response arrives into slirp, it puts its addresse back as source addresse and delivers it to the UML machine. Could you be more precise about the incoming connections that fails ? Le vendredi 04 juin 2010 à 18:06 +0200, Geert Uytterhoeven a écrit : > On Tue, Jun 1, 2010 at 23:28, clownix <clow...@clownix.net> wrote: > > I must tell you that you can have an UML ubuntu 10.04 in the > > cloonix environment at http://cloonix.net > > And the cloonix environement has a slirp integrated inside its > > own network and you can surf on internet from your UML ubuntu > > plug-and-play. > > Assumed you don't hit the problem we're seeing on the _host_? > > > Note: due to libssl used in cloonix, most users have to > > recompile the cloonix tree and as the cloonix also supports > > KVM, the following packages are needed for good compilation: > > yum install gtk-vnc-devel > > yum install vte-devel > > or > > apt-get install libgtk-vnc-1.0-dev > > apt-get install libvte-dev > > > > Note: The slirp in cloonix has been recoded, but comes from the > > official slirp. > > So that slirp version may have a workaround? > > > Le mardi 01 juin 2010 à 22:32 +0200, Geert Uytterhoeven a écrit : > >> On Mon, 19 Apr 2010, Mark Longair wrote: > >> > I wonder if someone could help me with a frustrating problem I'm > >> > having with slirp-based networking in UML? (I've tried asking > >> > on the slirp-devel mailing list, but didn't get any response.) > >> > I'd be very grateful for any help. > >> > > >> > Although this has worked for me successfully in the past, I'm > >> > having trouble getting the "redir" option for slirp to work > >> > properly for connecting to a UML instance. (Network access from > >> > the UML machine to the outside world works fine, it's just the > >> > incoming connections that fail.) > >> > >> I'm having the same problem on 2 machines running Ubuntu (9.04 in the past > >> and > >> 10.04 now), while it works fine on CentOS 5 and used to work fine on my > >> previous > >> machine running Debian. > >> > >> > This appears to set up the redirections correctly, since I see the > >> > following output (with some whitespace edited for readability): > >> > > >> > [..] > >> > Setting up networking.... > >> > Configuring network interfaces... > >> > Slirp v1.0.17 (BETA) FULL_BOLT > >> > Copyright (c) 1995,1996 Danny Gasparovski and others. > >> > All rights reserved. > >> > This program is copyrighted, free software. > >> > Please read the file COPYRIGHT that came with the Slirp > >> > package for the terms and conditions of the copyright. > >> > Logging statistics > >> > Redirecting TCP port 8042 to 10.0.2.15:80 > >> > Redirecting TCP port 2242 to 10.0.2.15:22 > >> > IP address of Slirp host: 127.0.1.1 > >> ^^^^^^^^^ > >> I noticed this is different: on the working CentOS setup, it shows the > >> external > >> (eth0) address of the host. On the failing setups, it shows a localhost > >> address. > >> You can see this even without running UML: just run slirp on the command > >> line. > >> Interestingly, I tried this on an Ubuntu machine at work (9.10, I > >> think), and there it > >> did show the external IP address. So it's probably related to the > >> presence of some > >> additional package. But which one? > >> > >> Then I discovered you can tell slirp which host address to use using the > >> `host addr a.b.c.d' option. And after that, redir works again for me! > > Gr{oetje,eeting}s, > > Geert > > -- > Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- > ge...@linux-m68k.org > > In personal conversations with technical people, I call myself a hacker. But > when I'm talking to journalists I just say "programmer" or something like > that. > -- Linus Torvalds ------------------------------------------------------------------------------ ThinkGeek and WIRED's GeekDad team up for the Ultimate GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the lucky parental unit. See the prize list and enter to win: http://p.sf.net/sfu/thinkgeek-promo _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
