Peder Chr. Nørgaard wrote:
On Monday 06 December 2004 15:04, Zoltan NAGY wrote:
The thing is, the answer is "same way as you give your host system an IPv6 address", which means that the answer depends more on what kind of distro you use for your guest root file system, than it depends on UML.Hello!
How can I give my uml it's on IPv6 address? It might sound stupid, but all I can read about is ipv4... any ideas?
for example, I'd like to create a tap device, with a specified ipv6
address, and then get UML to use this tap interface..
hmm. That's great! :) I've tried...
I've created a tap0 device:
inefty:~# ifconfig tap0
tap0 Link encap:Ethernet HWaddr 00:FF:01:C5:FB:CE
inet6 addr: 3ffe:2c03:90::10/128 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3582 errors:0 dropped:0 overruns:0 frame:0
TX packets:3638 errors:0 dropped:8 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:309576 (302.3 KiB) TX bytes:313372 (306.0 KiB)nefty:~#
set the routing: nefty:~# ip -6 route | grep tap0 3ffe:2c03:90::10 dev tap0 metric 1024 mtu 1500 advmss 1440 metric10 64 3ffe:2c03:90::11 dev tap0 metric 1024 mtu 1500 advmss 1440 metric10 64
started uml using:
./linux ubd0=tesztgep/root_fs_tesztgep con0=null,fd:2 con1=fd:0,fd:1 eth0=tuntap,tap0
configured eth0: devbox:~# ifconfig eth0 up dev_ip_addr - device not assigned an IP address devbox:~# ifconfig eth0 add 3ffe:2c03:90::11 SIOCSIFADDR: Cannot allocate memory
and, wow, it fails! But not always, it works sometimes.. (the guest is a 2.6.9-ac12-bb4 anyway)
like now: devbox login: root Last login: Mon Dec 6 19:15:11 2004 on tty1 Linux devbox 2.6.9-ac12-bb4 #1 Fri Dec 3 20:13:29 CET 2004 i686 GNU/Linux devbox:~# ifconfig lo 127.0.0.1 devbox:~# ifconfig eth0 up dev_ip_addr - device not assigned an IP address devbox:~# ifconfig eth0 add 3ffe:2c03:90::11/128 devbox:~# route add -A inet6 2000::/3 dev eth0 devbox:~#
so, after that, I try to ping the other end of the tap iface:
devbox:~# ping6 3ffe:2c03:90::10
PING 3ffe:2c03:90::10(3ffe:2c03:90::10) 56 data bytes
From 3ffe:2c03:90::10 icmp_seq=1 Destination unreachable: Address unreachable
From 3ffe:2c03:90::10 icmp_seq=2 Destination unreachable: Address unreachable
and so on..
running tcpdump -ni tap0 on the host gives:
20:21:06.312699 3ffe:2c03:90::11 > ff02::1:ff00:10: icmp6: neighbor sol: who has 3ffe:2c03:90::10
20:21:06.312759 3ffe:2c03:90::10 > 3ffe:2c03:90::11: icmp6: neighbor adv: tgt is 3ffe:2c03:90::10
20:21:06.313009 3ffe:2c03:90::11 > 3ffe:2c03:90::10: icmp6: echo request seq 1
20:21:07.310007 3ffe:2c03:90::11 > 3ffe:2c03:90::10: icmp6: echo request seq 2
20:21:08.327416 3ffe:2c03:90::11 > 3ffe:2c03:90::10: icmp6: echo request seq 3
20:21:09.312596 3ffe:2c03:90::10 > 3ffe:2c03:90::11: [|icmp6]
20:21:09.312616 3ffe:2c03:90::10 > 3ffe:2c03:90::11: [|icmp6]
20:21:09.312621 3ffe:2c03:90::10 > 3ffe:2c03:90::11: [|icmp6]
and so on..
after I've pressed C-c on the guest, it prints:
20:21:14.400956 3ffe:2c03:90::11 > 3ffe:2c03:90::10: icmp6: echo request seq 9
20:21:15.364553 3ffe:2c03:90::10 > ff02::1:ff00:11: icmp6: neighbor sol: who has 3ffe:2c03:90::11
20:21:15.365860 3ffe:2c03:90::11 > 3ffe:2c03:90::10: icmp6: neighbor adv: tgt is 3ffe:2c03:90::11
20:21:16.364210 3ffe:2c03:90::10 > ff02::1:ff00:11: icmp6: neighbor sol: who has 3ffe:2c03:90::11
20:21:16.370380 3ffe:2c03:90::11 > 3ffe:2c03:90::10: icmp6: neighbor adv: tgt is 3ffe:2c03:90::11
20:21:17.363873 3ffe:2c03:90::10 > ff02::1:ff00:11: icmp6: neighbor sol: who has 3ffe:2c03:90::11
20:21:17.364060 3ffe:2c03:90::11 > 3ffe:2c03:90::10: icmp6: neighbor adv: tgt is 3ffe:2c03:90::11
and so on, like in an infinite loop..
any ideas? It must be a routing mistake made by me, I suppose, but.. where? :) Where does ff02::1:ff00:11: comes into play?
Thanks in advance,
Zoltan NAGY, Software Engineer
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