Re: [Xen-users] domU not able to access external network

["ashutosh mehra" <mehra.ashutosh@xxxxxxxxx>]

Output of 'route -n':
In domU:
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
123.237.216.0   0.0.0.0         255.255.248.0   U     0      0        0 eth0
0.0.0.0         123.237.216.1   0.0.0.0         UG    100    0        0 eth0

In dom0:
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
123.237.216.0   0.0.0.0         255.255.248.0   U     0      0        0 eth0
0.0.0.0         123.237.216.1   0.0.0.0         UG    100    0        0 eth0

Both are same.
Enabling IP forwarding also does not work.

Thanks,
Ashutosh

On Sun, Sep 14, 2008 at 9:40 PM, Tej <bewith.tej@xxxxxxxxx> wrote:

On Sat, Sep 13, 2008 at 8:09 PM, ashutosh mehra
<mehra.ashutosh@xxxxxxxxx> wrote:
> I have Xen 3.2 with ubuntu-hardy as dom0 and domU.
> domU and dom0 are able to ping each other. While dom0 is able to access
> external network, domU fails to do so.
>
> This is my configuration file for domU:
> ************************************************8
> kernel      = '/boot/vmlinuz-2.6.24-19-xen'
> ramdisk     = '/boot/initrd.img-2.6.24-19-xen'
> memory      = '128'
> root        = '/dev/hda2 ro'
> disk        = [
>
> 'tap:aio:/home/xen/domains/xen1.hardy.com/swap.img,hda1,w',
>
> 'tap:aio:/home/xen/domains/xen1.hardy.com/disk.img,hda2,w',
>               ]
> name        = 'xen1.hardy.com'
> dhcp        = 'dhcp'
> vif         = [ 'mac=00:16:3E:7E:85:8A' ]
> > > on_reboot   = 'restart'
> on_crash    = 'restart'
> extra = '2 console=xvc0'
> *******************************************
>
> This is the result of ifconfig on domU:
> *******************************************
> eth0      Link encap:Ethernet  HWaddr 00:16:3e:7e:85:8a
>           inet addr:123.237.221.140  Bcast:123.237.223.255
> Mask:255.255.248.0
>           inet6 addr: 2002:7bed:dd03:4:216:3eff:fe7e:858a/64 Scope:Global
>           inet6 addr: 2002:7bed:d99f:4:216:3eff:fe7e:858a/64 Scope:Global
>           inet6 addr: fec0::4:216:3eff:fe7e:858a/64 Scope:Site
>           inet6 addr: fec0::9:216:3eff:fe7e:858a/64 Scope:Site
>           inet6 addr: 2002:7bed:dbc8:9:216:3eff:fe7e:858a/64 Scope:Global
>           inet6 addr: fe80::216:3eff:fe7e:858a/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:153833 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:339 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:44702020 (42.6 MB)  TX bytes:41663 (40.6 KB)
>
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:4 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:936 (936.0 B)  TX bytes:936 (936.0 B)
> *******************************************
>
> This is result of ifconfig on dom0:
> *******************************************
> eth0      Link encap:Ethernet  HWaddr 00:17:08:2e:f0:38
>           inet addr:123.237.218.27  Bcast:123.237.223.255
> Mask:255.255.248.0
>           inet6 addr: 2002:7bed:dd03:4:217:8ff:fe2e:f038/64 Scope:Global
>           inet6 addr: 2002:7bed:d99f:4:217:8ff:fe2e:f038/64 Scope:Global
>           inet6 addr: fec0::4:217:8ff:fe2e:f038/64 Scope:Site
>           inet6 addr: fec0::9:217:8ff:fe2e:f038/64 Scope:Site
>           inet6 addr: 2002:7bed:dbc8:9:217:8ff:fe2e:f038/64 Scope:Global
>           inet6 addr: fe80::217:8ff:fe2e:f038/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:100339 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:6026 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:13079829 (12.4 MB)  TX bytes:1102556 (1.0 MB)
>
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:88 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:88 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:4400 (4.2 KB)  TX bytes:4400 (4.2 KB)
>
> peth0     Link encap:Ethernet  HWaddr 00:17:08:2e:f0:38
>           inet6 addr: fe80::217:8ff:fe2e:f038/64 Scope:Link
>           UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
>           RX packets:180678 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:5976 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:57972238 (55.2 MB)  TX bytes:1117217 (1.0 MB)
>           Interrupt:16
>
> vif1.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
>           inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>           UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
>           RX packets:341 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:156172 errors:0 dropped:466 overruns:0 carrier:0
>           collisions:0 txqueuelen:32
>           RX bytes:36973 (36.1 KB)  TX bytes:45273041 (43.1 MB)
> *******************************************
>
> 'brctl show' displays:
>
> bridge name    bridge id        STP enabled    interfaces
> eth0        8000.0017082ef038    no        peth0
>                             vif1.0
>
> Should the MAC address of eth0 in domU and dom0 be same?
> Do I need to make any changes in configuration file?

can you provide the 'route -n' command output on domU and dom0.

try once by enabling IP forwarding on dom0
echo 1 > /proc/sys/net/ipv4/ip_forward

HTH

>
> Thanks,
> Ashutosh
>
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>

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