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xen-devel
[Xen-devel] NAT through Dom0 on unstable branch
Hello,
I might be the first to encounter this issue, so I think it is worth posting...
I am trying to set up a configuration in which a DomU and Dom0 are on
their own subnet, and DomU accesses the real network through Dom0's
NAT.
These are the steps that I take (note, these steps worked fine in
"testing" and "stable" branches):
I first set up a bridge with a private IP:
brctl addbr mybr0
ip addr add 192.168.0.1/24 dev mybr0
ip link set mybr0 up
These are my network scripts in the xend config file:
(network-script network-route)
(vif-script vif-bridge)
(vif-bridge mybr0)
I start a DomU with an IP of 192.168.0.101, and I am able to ping Dom0
(192.186.0.1).
I enable IP forwarding, and I set up NAT:
sysctl -w net.ipv4.ip_forward=1 # (if not allready done by xend)
iptables -t nat -A POSTROUTING -j MASQUERADE \
-o eth0 -s 192.168.0.1/24
I am able to ping the outside world by IP, but name resolution, or any
other TCP/IP traffic does not work.
The very strange part is that tcpdump seems to show packets arriving
at their destination on the outside world hosts. but besides the ACKs,
the outside hosts do not respond.
I am not a networking expert, so I am sorry if my diagnoses is not full.
Here is a bit more info (on Dom0):
# iptables -t nat -L
Chain PREROUTING (policy ACCEPT)
target prot opt source destination
Chain POSTROUTING (policy ACCEPT)
target prot opt source destination
MASQUERADE all -- 192.168.0.0/24 anywhere
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0F:1F:8C:17:D6
inet addr: 10.0.20.10 Bcast:10.0.255.255 Mask:255.255.0.0
UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
RX packets:30868 errors:0 dropped:0 overruns:0 frame:0
TX packets:1121 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:8172500 (7.7 Mb) TX bytes:158965 (155.2 Kb)
Base address:0xdf40 Memory:fcfe0000-fd000000
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:5 errors:0 dropped:0 overruns:0 frame:0
TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:288 (288.0 b) TX bytes:288 (288.0 b)
mybr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet addr:192.168.0.1 Bcast:0.0.0.0 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:834 (834.0 b) TX bytes:938 (938.0 b)
vif1.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:13 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1044 (1.0 Kb) TX bytes:812 (812.0 b)
# brctl show
bridge name bridge id STP enabled interfaces
mybr0 8000.feffffffffff no vif1.0
Thanks!
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