I've been out of UML for a while, but perhaps I can still throw something
useful in the mix.
rh
#!/bin/bash
#
# tuntap script
#
# Create and configure the tap devices for UML users
# This script will do a maximum of 10 (0-9), but can easily be changed
#
# You can delete (or rename) the "uml_net" helper to remove a security hole.
# UML users will not be able to reconfigure their network TAP device and
# will not be able to use another. As far as I know?!?!?!?
#
# The UMLaddr should be "real" so the UML server can be seen.
# The HOSTaddr can be "fake" or any address you like. You can conserve IP
# addresses this way. Of course, they can be real as well.
#
# The UML client is setup the normal way. The default route gateway is
# the IP address for eth0.
#
# I use the following example ethernet specification on my command line:
# eth0=tuntap,tap0,FE:FF:C0:A8:01:C8,10.50.15.200
#
# 2004.08.13.Richard Hagemeyer,VE3UNW Initial script (a Friday)
#
############################################################################
##############################
#
# Some variables to keep things easy
#
NETWORK="192.168.1.0/24" #
Your network address/netmask
UMLaddr="192.168.1.20" #ex: 192.168.1.200-209 # IP
addr prefix of the UML end
HOSTaddr="10.50.15.20" #ex: 10.50.15.200-209 # IP
addr prefix of the HOST end
UMLuser="uml" #ex: uml0,uml1,eml2.... #
The uml username "prefixes"
ETH="eth0" #
The real ethernet device
route del -net 169.254.0.0/16 #
Don't need this route
modprobe tun #
Get the tun module loaded
echo 1 > /proc/sys/net/ipv4/ip_forward #
Allow the host to forward
for i in 0 1 2 3 4 ; do #
Loop to create devices/users
tunctl -u ${UMLuser}${i} -t tap${i} #
Create the TAP device
ip link set dev tap${i} up #
Add the TAP device
ifconfig tap${i} ${HOSTaddr}${i} netmask 255.255.255.255 up #
Configure the TAP device
route add -host ${UMLaddr}${i} tap${i} #
Need a route to the device
route del -net ${NETWORK} #
Delete the default route created
echo 1 > /proc/sys/net/ipv4/conf/tap${i}/proxy_arp #
Allow dynamic configuration
arp -Ds ${UMLaddr}${i} ${ETH} pub #
eth0 should respond to the UMLip
done
route add -net ${NETWORK} ${ETH} #
Add the default route back
ifconfig #
See what we've done
route -n
arp -n
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