Running Gutsy (7.10) 32bit.
I start the guest with:
kvm -hda guest.img -m 1024 -net nic -net tap
Starting the guest gives the same error:
can't add tap0 to bridge eth1: Operation not supported
But the tap0 device exists:
7: tap0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 500
link/ether 00:ff:87:13:e9:96 brd ff:ff:ff:ff:ff:ff
inet 10.20.30.40/8 brd 10.255.255.255 scope global tap0
inet6 fe80::2ff:87ff:fe13:e996/64 scope link
valid_lft forever preferred_lft forever
After the guest has started, on the guest, I execute:
ifconfig eth0 10.20.30.50 netmask 255.255.255.0
route add default gw 10.20.30.40
echo "MY-NAMESERVER-IP" > /etc/resolv.conf
and on the host:
ifconfig tap0 10.20.30.40
modprobe ip_tables
modprobe iptable_nat
echo "1" > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
and it works both ways: from the guest I can reach internet and from the
host I can ssh into the guest.
Good luck!
Ace
--
kvm-ifup fails to bring up tap0 in feisty
https://bugs.launchpad.net/bugs/125302
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