Jeff Dike <[EMAIL PROTECTED]> writes:
> Run a UML on the one machine you have root on as the gateway to the
> outside world - either with TUN/TAP or a uml_switch attached to a
> TUN/TAP device.
okay, I am trying to implement your suggestion (I am starting with
getting this single UML up and running with access to the outside
world, on the box I actually have root on) and I ran into a problem.
I run the following as root on 'host', which has IP address
140.254.80.34:
#!/bin/sh
set -x
tunctl -u rutt
ifconfig tap0 192.168.0.254 up
echo 1 > /proc/sys/net/ipv4/ip_forward
route add -host 192.168.0.253 dev tap0
bash -c 'echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp'
arp -Ds 192.168.0.253 eth0 pub
chmod 666 /dev/net/tun
Then try to ping another host which exists on my network, again from
'host' (I'll use the fact I can ping this host, later):
# ping 140.254.80.4
PING 140.254.80.4 (140.254.80.4) 56(84) bytes of data.
64 bytes from 140.254.80.4: icmp_seq=1 ttl=128 time=0.231 ms
64 bytes from 140.254.80.4: icmp_seq=2 ttl=128 time=0.223 ms
--- 140.254.80.4 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.223/0.227/0.231/0.004 ms
I then the run the following on the same box to produce my 'guest':
$ linux ubd0=root_fs eth0=tuntap,tap0
[... login as root ...]
Linux (none) 2.4.27-1um #1 Mon Feb 20 16:29:33 EST 2006 i686 unknown
Most of the programs included with the Debian GNU/Linux system are
freely redistributable; the exact distribution terms for each program
are described in the individual files in /usr/share/doc/*/copyright
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
(none):~# ifconfig eth0 192.168.0.253 up
(none):~# route add default gw 192.168.0.254
(none):~# ping 192.168.0.254
PING 192.168.0.254 (192.168.0.254): 56 data bytes
64 bytes from 192.168.0.254: icmp_seq=0 ttl=64 time=0.7 ms
64 bytes from 192.168.0.254: icmp_seq=1 ttl=64 time=0.5 ms
--- 192.168.0.254 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.5/0.6/0.7 ms
(none):~# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.0.0 * 255.255.255.0 U 0 0 0 eth0
default 192.168.0.254 0.0.0.0 UG 0 0 0 eth0
(none):~# route del -net 192.168.0.0 dev eth0 netmask 255.255.255.0
(none):~# route add -host 192.168.0.254 dev eth0
(none):~# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.0.254 * 255.255.255.255 UH 0 0 0 eth0
default 192.168.0.254 0.0.0.0 UG 0 0 0 eth0
(none):~# ping 140.254.80.34
PING 140.254.80.34 (140.254.80.34): 56 data bytes
64 bytes from 140.254.80.34: icmp_seq=0 ttl=64 time=1.5 ms
64 bytes from 140.254.80.34: icmp_seq=1 ttl=64 time=0.5 ms
--- 140.254.80.34 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.5/1.0/1.5 ms
(none):~# ping 140.254.80.4
PING 140.254.80.4 (140.254.80.4): 56 data bytes
So it appears that the packets coming from the guest are not able to
be forwarded across the host's network. Does anyone see what I might
be doing wrong?
Thank you,
--
Benjamin
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