Usermode-Linux Networking not working

[firsm]

Hello,

I'm trying to set up networking inside of my UML.
I am using a root_fs image from the official UML Webpage (Debian-3.0r0.ext2) and this kernel:
http://uml.nagafix.co.uk/kernels/kernel32-2.4.32-bs2 (http://uml.nagafix.co.uk/kernels/kernel32-2.4.32-bs2.config)

To start the UML I issue the following command:

./kernel32-2.4.32-bs2 ubd0=./Debian-3.0r0.ext2 eth0=tuntap,,,192.168.0.100 root=/dev/ubda

This will bring up a tap interface called tap0 on my HOST system:

tap0 Link encap:Ethernet HWaddr 0E:95:D4:C4:8A:C1
inet addr:192.168.0.100 Bcast:192.168.0.255 Mask:255.255.255.255
inet6 addr: fe80::c95:d4ff:fec4:8ac1/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 b) TX bytes:258 (258.0 b)

And the following route on my HOST system:

Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.0.5 * 255.255.255.255 UH 0 0 0 tap0

My GUEST system is using this configuration:

eth0 Link encap:Ethernet HWaddr FE:FD:C0:A8:00:05
inet addr:192.168.0.5 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:216 (216.0 b) TX bytes:0 (0.0 b)
Interrupt:5


Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.0.0 * 255.255.255.0 U 0 0 0 eth0
default 192.168.0.100 0.0.0.0 UG 0 0 0 eth0

Anyway, if I try to ping 192.168.0.100 from my UML, I lose 100% of the ICMP packets.

The interesting part is to start tcpdump on my HOST system while pinging it from the UML:

homer var # tcpdump -i tap0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tap0, link-type EN10MB (Ethernet), capture size 96 bytes
21:48:32.807239 IP 192.168.0.5 > 192.168.0.100: ICMP echo request, id 37888, seq 0, length 64
21:48:32.807324 IP 192.168.0.100 > 192.168.0.5: ICMP host 192.168.0.100 unreachable, length 92
21:48:37.806336 arp who-has 192.168.0.5 tell 192.168.0.100
21:48:37.806488 arp reply 192.168.0.5 is-at fe:fd:c0:a8:00:05 (oui Unknown)

Well, I've tried almost everything so far. Any help would be highly appreciated.
Thanks in advance

Fabian Hirschmann

[firsm]

Hello,

Well I still haven't gotten it up and running - Could my firewall cause any problems here?

Fabian Hirschmann