Hi, Not sure about this but I'm wondering if your problem is that you're trying to access uml through a tap device on the same network as your host machine's ethernet interface.
The only way I've managed to get things working is by putting tap0 on a separate network to the other network interfaces. I.e. eth0 is on network 10.0.0.0 (netmask 255.0.0.0), eth1 is on 192.168.1.0 (netmask 255.255.255.0) and tap0 is on 192.168.2.0 (netmask 255.255.255.0), with the ip address of tap0 being 192.168.2.1, and the uml machine's eth0 on 192.168.2.2. This way just bringing up the tap0 interface with: ifconfig $ETHTAP $ETHTAPADDR netmask $ETHTAPMASK up seems to create the correct routing on the host machine to make sure packets sent to its eth0 or eth1 device with ip address 192.168.2.2 end up at the uml machine. This works without any need for proxy arp or specific routeing instructions. However, - This is only the way I've got it working, and there may be other valid approaches. - It wouldn't quite solve your problem, as you would still need to make sure that packets sent to the host's eth0 on 1.2.5.3 are forwarded to the machine 192.168.2.2 (or whatever you have set up the guest as). I'm not sure how you do this in linux, but it should be possible I think. Hope this is of some help at least, andy Christian H. Kuhn wrote: > Hi all, > > I found UML and found it a good thing. I tried it on my local > machine. Everything worked fine. What i did (from Step 3 as root): > (Host is on 192.168.1.xxx network) > > dd if=/dev/zero of=uml-root-jaunty bs=4096 seek=1M count=1 > mkfs.ext3 uml-root-jaunty > mount -o loop uml-root-jaunty /mnt/testvm > debootstrap jaunty /mnt/testvm http://de.archive.ubuntu.com/ubuntu > echo "/dev/ubd0 / ext3 defaults 0 1" > /mnt/testvm/etc/fstab > echo "proc /proc proc defaults 0 0" >> /mnt/testvm/etc/fstab > echo "127.0.0.1 localhost" > /mnt/testvm/etc/hosts > echo "auto lo" > /mnt/testvm/etc/network/interfaces > echo "iface lo inet loopback" >> /mnt/testvm/etc/network/interfaces > echo "auto eth0" >> /mnt/testvm/etc/network/interfaces > echo "iface eth0 inet static" >> /mnt/testvm/etc/network/interfaces > echo " address 192.168.1.251" >> /mnt/testvm/etc/network/interfaces > echo " netmask 255.255.255.0" >> /mnt/testvm/etc/network/interfaces > echo "tty0" >> /mnt/testvm/etc/securetty > echo "ttys/0" >> /mnt/testvm/etc/securetty > rm /mnt/testvm/etc/event.d/tty2 > rm /mnt/testvm/etc/event.d/tty3 > rm /mnt/testvm/etc/event.d/tty4 > rm /mnt/testvm/etc/event.d/tty5 > rm /mnt/testvm/etc/event.d/tty6 > > I cd to /mnt/testvm/lib/modules and copied > /usr/lib/uml/modules/2.6.22-5c5 there. After that, i chrooted into > /mnt/testvm, set passwd, left chroot, and started > > linux ubd0=uml-root-jaunty umid=uml1 eth0=tuntap,,,192.168.1.250 > > The UML guest started and opened 6 gnome terminals (only one with a > login prompt, but that was sufficient). I logged in as root, installed > the ssh daemon, and to avoid the now unnecessary terminals, i added > next time con0=fd:0,fd:1 con=pts to the start parameters. Everything > worked fine. > > So i promised a friend a virtual server on my dedicated server. It's a > machine i have no physical access to. Let's say it's IP is 1.2.3.4. My > provider gave me still network addresses 1.2.5.0/255.255.255.248. A > traceroute shows that those additional IP are properly routed to my > server. It is running an up-to-date ubuntu, and generally working > fine. I installed all prerequisites. > > Now i repeated the above process. Of course, i gave not 192.168.1.251 > in the echo command, but 1.2.5.3, what i selected for the guest. I > copied the uml-modules and chrooted for setting a password. And i > started with > > linux ubd0=uml-root-jaunty umid=uml1 eth0=tuntap,,,1.2.5.1 ssl=port:9000 > > (i don't get a terminal at my machine at home, and somehow i need to > connect), so that the hosts tap0 has 1.2.5.1 as IP. I get a lot of > errors, mostly that mknod could not create a db file /dev/... because > no space left on device. The root fs is mounted ro, so i did not > expect anything else, and on my local machine it worked. But also i > get: > > * Loading hardware drivers... > [42949377.410000] * > modprobe tun > > [42949377.410000] * ifconfig tap0 1.2.5.1 netmask 255.255.255.255 up > > [42949377.410000] * bash -c echo 1 > /proc/sys/net/ipv4/ip_forward > > [42949377.410000] * route add -host 1.2.5.3 dev tap0 > > [42949377.410000] * bash -c echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp > > [42949377.410000] * arp -Ds 1.2.5.3 eth0 pub > > [42949377.410000] * arp -Ds 1.2.5.3 eth0 pub > > [42949377.410000] * route del -host 1.2.5.3 dev tap0 > > [42949377.410000] * bash -c echo 0 > /proc/sys/net/ipv4/conf/tap0/proxy_arp > > [42949377.410000] * arp -i eth0 -d 1.2.5.3 pub > > [42949377.410000] * arp -i eth0 -d 1.2.5.3 pub > > [42949377.410000] Kein ARP-Eintrag für 1.2.5.3 > > [42949377.410000] * route add -host 1.2.5.3 dev tap0 > > [42949377.410000] * bash -c echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp > > The third line from bottom translates from german to "no ARP-Entry for > 1.2.5.3" > > On the host OS, ifconfig finds > > tap0 Link encap:Ethernet Hardware Adresse be:fa:2d:92:11:39 > inet Adresse:1.2.5.1 Bcast:88.255.255.255 Maske:255.255.255.255 > inet6-Adresse: fe80::bcfa:2dff:fe92:1139/64 > Gültigkeitsbereich:Verbindung > UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1 > RX packets:6 errors:0 dropped:0 overruns:0 frame:0 > TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 > Kollisionen:0 Sendewarteschlangenlänge:500 > RX bytes:468 (468.0 B) TX bytes:468 (468.0 B) > > and route > > 1.2.5.3 * 255.255.255.255 UH 0 0 0 tap0 > > But a ping finds its target. And nmap shows all ports, especially > 9000, closed. How do i get inside the guest? > > Also, 1.2.5.3 is not pingable from my home machine. Is there anything > else for making routing possible? > > TIA from an uml newbie > QNo > > > > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
