I 've looked through the docs and googled the heck out of this list and the
'net, but can't find a single working example of a slip setup.
I need to use slip because I am running the UML in a VPS (with no kernel
tun/tap support, exactly the situation pointed out in the docs as the only
reason to use slip)
There's a lot of commentary about how slip was the first way UML was connected
to the 'net and how it has drawbacks, but unfortunately the examples present in
the documentation make a lot of assumptions about the host. I get the feeling
the author genuinely believed that using slip was a bad thing, and so avoided
giving a useful example as a way of discouraging its use.
Here's my config so far (all taken from the docs, but not verbatim, as it would
collide with my upstream router)
#HOST ./linux-2.6.24-rc7 ubda=Fedora.cow,FedoraCore5-x86-root_fs
eth0=slip,192.168.0.1
[... loading noise...]
[r...@localhost ~]# dmesgLinux version 2.6.24-rc7-dirty
(jd...@tp.user-mode-linux.org) (gcc version 4.1.2 20070925 (Red Hat 4.1.2-27))
#97 Mon Jan 7 11:18:24 EST 2008[...snip...]net_namespace: 64 bytesUsing 2.6
host AIONET: Registered protocol family 16NET: Registered protocol family
2Time: itimer clocksource has been installed.Switched to high resolution mode
on CPU 0IP route cache hash table entries: 1024 (order: 0, 4096 bytes)TCP
established hash table entries: 2048 (order: 2, 16384 bytes)TCP bind hash table
entries: 2048 (order: 1, 8192 bytes)TCP: Hash tables configured (established
2048 bind 2048)TCP reno registeredChecking host MADV_REMOVE
support...<3>MADV_REMOVE failed, err = -38Can't release memory to the host -
memory hotplug won't be supportedmconsole (version 2) initialized on
/root/.uml/wOqluE/mconsole[...snip...]TCP cubic registeredNET: Registered
protocol family 1NET: Registered protocol family 17Initialized stdio console
driverConsole initialized on /dev/tty0console [tty0] enabledInitializing
software serial port version 1Choosing a random ethernet address for device
eth0Netdevice 0 (66:35:f6:cf:fb:ab) : SLIP backend - SLIP IP =
192.168.0.1console [mc-1] enabled[...snip...]Setting slip line discipline:
Invalid argumentuml_net : waitpid process 15689 failed, errno = 10slip_tramp
failed - err = 10
[r...@localhost ~]# ifconfiglo 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)
[r...@localhost ~]# ifconfig eth0 upSetting slip line discipline: Invalid
argumentuml_net : waitpid process 27924 failed, errno = 10get_ifname failed,
err = 22SIOCSIFFLAGS: Invalid argument[r...@localhost ~]# routeKernel IP
routing tableDestination Gateway Genmask Flags Metric Ref
Use Iface169.254.0.0 * 255.255.0.0 U 0 0
0 lo
[from the docs, 2 steps to configure the interface for slip, albeit not
explicitly given.]
[r...@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0ONBOOT=yesIPADDR=192.168.0.100GATEWAY=192.168.0.1NETMASK=255.255.255.0
[r...@localhost ~]# halt
#HOST ifconfig sl0 192.168.0.1 pointopoint 192.168.0.100 upSIOCSIFADDR: No such
devicesl0: unknown interface: No such deviceSIOCSIFDSTADDR: No such devicesl0:
unknown interface: No such devicesl0: unknown interface: No such device
Best guess at this point is I'm missing something here to create the virtual
slip network interface, and possibly the other portion is failing because it is
not present, but the errors are not so helpful. "Setting slip line discipline:
Invalid argument" "uml_net : waitpid process 27924 failed, errno = 10"
"get_ifname failed, err = 22" "SIOCSIFFLAGS: Invalid argument" - sounds like
the guest side (or echoing the host side, vague) was unable to find the slip
interface.
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