Emiliano Gabrielli (aka AlberT)
2006-May-31 09:51 UTC
[Xen-users] NAT and cross-domU comunications
Hi there,
I have a working configuration using nat for domUs (private IPs for each VM
and a single public IP for the dom0).
Now I need to let domUs to comunicate each other, but it''s not so easy
for
me ..
The running configuration is:
- host1
vif = [ ''mac=00:16:3e:00:00:01, vifname=vm_1.0,
ip=10.0.0.101'' ]
gateway = "10.0.0.228"
ip = "10.0.0.101"
-host2
vif = [ ''mac=00:16:3e:00:00:02, vifname=vm_2.0,
ip=10.0.0.102'' ]
gateway = "10.0.0.229"
ip = "10.0.0.102"
I had to specify the gateway since I can''t find a way to force the dom0
ip
and/or mac address.. the IP is always 127+"last number in the
domU''s IP", and
the MAC address is always FE:FF:FF:FF:FF:FF:
vm_1.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet addr:10.0.0.228 Bcast:0.0.0.0 Mask:255.255.255.255
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:510352 errors:0 dropped:0 overruns:0 frame:0
TX packets:405047 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:500629686 (477.4 MiB) TX bytes:114119233 (108.8 MiB)
vm_2.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet addr:10.0.0.229 Bcast:0.0.0.0 Mask:255.255.255.255
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:651 errors:0 dropped:0 overruns:0 frame:0
TX packets:793 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:320398 (312.8 KiB) TX bytes:330502 (322.7 KiB)
I think the problem is arp-related, since sniffing in dom0 I can see ARP
requests and reply indicating FE:FF:FF:FF:FF:FF as the 2nd domU haddr, but it
is only the one in dom0... and it is the same of the 1st host.. so maybe the
arp reply should be able to address the two different hosts with two
different HADDR:
mi01:/etc/xen# arping 10.0.0.102 -I vm_2.0
ARPING 10.0.0.102 from 10.0.0.229 vm_2.0
Unicast reply from 10.0.0.102 [00:16:3E:00:00:02] 0.654ms
mi01:/etc/xen# arping 10.0.0.101 -I vm_1.0
ARPING 10.0.0.101 from 10.0.0.228 vm_1.0
Unicast reply from 10.0.0.101 [00:16:3E:00:00:01] 0.598ms
mi01:/etc/xen# arp
Address HWtype HWaddress Flags Mask Iface
10.0.0.102 ether 00:16:3E:00:00:02 C vm_2.0
10.0.0.101 ether 00:16:3E:00:00:01 C vm_1.0
in domU n°1:
# arp
Address HWtype HWaddress Flags Mask Iface
10.0.0.228 ether FE:FF:FF:FF:FF:FF C eth0
# ping 10.0.0.102
PING 10.0.0.102 (10.0.0.102) 56(84) bytes of data.
From 10.0.0.101 icmp_seq=1 Destination Host Unreachable
--- 10.0.0.102 ping statistics ---
5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4005ms
, pipe 3
# arp
Address HWtype HWaddress Flags Mask Iface
10.0.0.228 ether FE:FF:FF:FF:FF:FF C eth0
10.0.0.102 (incomplete) eth0
Anyone has some tips plz ???
Thanks in advance
--
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