I have been fighting with the networking setup of uml for a couple of
weeks now on and off. I have been trying to set up a connection
outside my host linux box. I can get a connection which allows me to
ssh into the uml from the host or the host from the uml, but every
setup I have tried seems to have the packets being dropped inside the
host and never reaching eth0 according to the counters. I have
followed the part about NAT:
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
as instructions say. I have also tried using a bridge as another set
of instructions suggested. Everything produces the same result --
packets disappear before reaching eth0 or somewhere in the middle of
the bridge. Using uml_net produces the same results as the long log
of command lines I am posting does -- packets show on tap0 counters,
but don't show on eth0 counters. I've pretty much run out of ideas to
try. Am I missing something in my kernel? I've been over it a couple
of times -- everything is now built in (no modules).
I am running gentoo with a 2.6.17 kernel
The "Easy" NAT way
[veryfine:/home/jkreager/uml]# tunctl -u jkreager
Set 'tap0' persistent and owned by uid 500
[veryfine:/home/jkreager/uml]# /sbin/ifconfig tap0 192.168.0.254 netmask
255.255.255.0 up
[veryfine:/home/jkreager/uml]# chmod 660 /dev/net/tun
[veryfine:/home/jkreager/uml]# ls -l /dev/net/tun
crw-rw---- 1 root umlusers 10, 200 Apr 11 22:02 /dev/net/tun
This didn't work:
[veryfine:~/uml/test01]$ linux-2.6.19-rc5 ubd0=Slackware-11-root_fs
eth0=tuntap\ ,tap0
[veryfine:~/uml/test01]$ linux-2.6.19-rc5 ubd0=Slackware-11-root_fs \
eth0=tuntap,tap0
UML
[EMAIL PROTECTED]:~# ifconfig eth0 192.168.0.253 netmask 255.255.255.0 up
Host
[veryfine:/home/jkreager/uml]# /sbin/route add -host 192.168.0.253 dev \
tap0
UML
[EMAIL PROTECTED]:~# route add default gw 192.168.0.254
[EMAIL PROTECTED]:~# ping 192.168.0.2
PING 192.168.0.2 (192.168.0.2) 56(84) bytes of data.
64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=0.253 ms
64 bytes from 192.168.0.2: icmp_seq=2 ttl=64 time=0.240 ms
64 bytes from 192.168.0.2: icmp_seq=3 ttl=64 time=0.231 ms
Host
[veryfine:/home/jkreager/uml]# echo 1 > /proc/sys/net/ipv4/ip_forward
[veryfine:/home/jkreager/uml]# echo 1 >
/proc/sys/net/ipv4/conf/tap0/proxy_arp
[veryfine:/home/jkreager/uml]# /sbin/arp -Ds 192.168.0.253 eth0 pub
[veryfine:/home/jkreager/uml]# /sbin/iptables -t nat -a POSTROUTING -o
eth0 -j SNAT -to 192.168.0.2
iptables v1.3.5: Unknown arg `-a'
Try `iptables -h' or 'iptables --help' for more information.
[veryfine:/home/jkreager/uml]# /sbin/iptables -t nat -A POSTROUTING -o
eth0 -j SNAT -to 192.168.0.2
Bad argument `192.168.0.2'
Try `iptables -h' or 'iptables --help' for more information.
[veryfine:/home/jkreager/uml]# /sbin/iptables -t nat -A POSTROUTING -o
eth0 -j SNAT --to 192.168.0.2
[veryfine:/home/jkreager/uml]#
[veryfine:/home/jkreager/uml]# /sbin/route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.0.253 0.0.0.0 255.255.255.255 UH 0 0 0 tap0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 tap0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
[veryfine:/home/jkreager/uml]# /sbin/route del -net 192.168.0.0 dev tap0
netmask 255.255.255.0
UML
[EMAIL PROTECTED]:~# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.0.254 0.0.0.0 UG 0 0 0 eth0
[EMAIL PROTECTED]:~# route del -net 192.168.0.0 dev eth0 netmask 255.255.255.0
[EMAIL PROTECTED]:~# route add -host 192.168.0.2 dev eth0
[EMAIL PROTECTED]:~# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.0.2 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.0.254 0.0.0.0 UG 0 0 0 eth0
[EMAIL PROTECTED]:~#
[EMAIL PROTECTED]:~# ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
--- 192.168.0.1 ping statistics ---
6 packets transmitted, 0 received, 100% packet loss, time 5031ms
[EMAIL PROTECTED]:~# route del -host 192.168.0.2 dev eth0
[EMAIL PROTECTED]:~# route add -host 192.168.0.254 dev eth0
[EMAIL PROTECTED]:~# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.0.254 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.0.254 0.0.0.0 UG 0 0 0 eth0
Host Counters Before Ping
eth0 RX bytes:154211383 (147.0 Mb) TX bytes:4877366 (4.6 Mb)
tap0 RX bytes:4368 (4.2 Kb) TX bytes:1736 (1.6 Kb)
Guest Counters Before Ping
eth0 RX bytes:1400 (1.3 KiB) TX bytes:4368 (4.2 KiB)
[EMAIL PROTECTED]:~# ping -c 2 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
--- 192.168.0.1 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1001ms
Host Counters After Ping
eth0 RX bytes:154211383 (147.0 Mb) TX bytes:4877366 (4.6 Mb)
tap0 RX bytes:4606 (4.4 Kb) TX bytes:1778 (1.7 Kb)
Guest Counters After Ping
eth0 RX bytes:1428 (1.3 KiB) TX bytes:4606 (4.4 KiB)
Bridging:
Host
[veryfine:~]# ls -l /dev/net/tun
crw-rw---- 1 root umlusers 10, 200 Apr 11 08:47 /dev/net/tun
[veryfine:~]# groups jkreager
wheel audio cdrom video usb jkreager rtc umlusers
[veryfine:~]#
[veryfine:~]# /sbin/brctl addbr umlbridge
[veryfine:~]# /sbin/brctl setfd umlbridge 0
[veryfine:~]# /sbin/brctl stp umlbridge off
[veryfine:~]# /sbin/ifconfig eth0 0.0.0.0 promisc up
[veryfine:~]# ifconfig umlbridge 192.168.0.2 netmask 255.255.255.0 up
bash: ifconfig: command not found
[veryfine:~]# /sbin/ifconfig umlbridge 192.168.0.2 netmask 255.255.255.0 up
[veryfine:~]# /sbin/brctl addif eth0
Incorrect number of arguments for command
Usage: brctl addif <bridge> <device> add interface to bridge
[veryfine:~]# /sbin/brctl addif umlbridge eth0
[veryfine:~]# tunctl -u jkreager
Set 'tap0' persistent and owned by uid 500
[veryfine:~]# /sbin/ifconfig tap0 0.0.0.0 promisc up
[veryfine:~]# /sbin/brctl addif umlbridge tap0
[veryfine:~]#
[veryfine:~]# ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=255 time=2.16 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=255 time=0.778 ms
--- 192.168.0.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
Start UML
[veryfine:~/uml/test01]$ linux-2.6.19-rc5 ubd0=Slackware-11-root_fs
eth0=tuntap,tap0
Inside Guest
[EMAIL PROTECTED]:~# ifconfig eth0 192.168.0.3 up
SIOCSIFFLAGS: Permission denied
SIOCSIFFLAGS: Permission denied
[EMAIL PROTECTED]:~#
Start UML as root
[veryfine:/home/jkreager/uml/test01]# /home/jkreager/bin/linux-2.6.19-rc5
ubd0=Slackware-11-root_fs eth0=tuntap,tap0
Inside Guest
[EMAIL PROTECTED]:~# ifconfig eth0 192.168.0.3 up
[EMAIL PROTECTED]:~# ifconfig
eth0 Link encap:Ethernet HWaddr 2A:93:E5:15:4E:B9
inet addr:192.168.0.3 Bcast:192.168.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 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:0 (0.0 b)
TX bytes:0 (0.0 b)
Interrupt:4
lo
Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0
frame:0 TX packets:0 errors:0 dropped:0 overruns:0
carrier:0 collisions:0 txqueuelen:0
RX bytes:0 (0.0 b)
TX bytes:0(0.0 b)
[EMAIL PROTECTED]:~# ping 192.168.0.2
PING 192.168.0.2 (192.168.0.2) 56(84) bytes of data.
64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=21.8 ms
64 bytes from 192.168.0.2: icmp_seq=2 ttl=64 time=0.245 ms
64 bytes from 192.168.0.2: icmp_seq=3 ttl=64 time=0.247 ms
--- 192.168.0.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2025ms
rtt min/avg/max/mdev = 0.245/7.436/21.817/10.168 ms
[EMAIL PROTECTED]:~#
[EMAIL PROTECTED]:~# ping -c 2 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
--- 192.168.0.1 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1001ms
ifconfig on Host before ping
tap0 RX bytes:812 (812.0 b) TX bytes:438 (438.0 b)
umlbridge RX bytes:24385 (23.8 Kb) TX bytes:930 (930.0 b)
eth0 RX bytes:2999569 (2.8 Mb) TX bytes:1091825 (1.0 Mb)
ifconfig on Host after ping
tap0 RX bytes:1050 (1.0 Kb) TX bytes:498 (498.0 b)
umlbridge RX bytes:24413 (23.8 Kb) TX bytes:930 (930.0 b)
eth0 RX bytes:3007651 (2.8 Mb) TX bytes:1091909 (1.0 Mb)
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