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

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

I am able to ping gateway from domU but still not able to ping external network.
I tried adding dom0's IP as gw for domU and then enabled IP forwarding but still no result.

Thanks,
Ashutosh

On Tue, Sep 16, 2008 at 2:01 PM, Tej <bewith.tej@xxxxxxxxx> wrote:

On 9/15/08, ashutosh mehra <mehra.ashutosh@xxxxxxxxx> wrote:
> Output of 'route -n':

it should work.  Are you able to ping gw from domU?

try making dom0 IP as gw for domU.
# route add default gw 123.237.221.140

Now enable forwarding on dom0.
Now see if it is pinging external network.

HTH

> 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
>> >
>> > _______________________________________________
>> > Xen-users mailing list
>> > Xen-users@xxxxxxxxxxxxxxxxxxx
>> > http://lists.xensource.com/xen-users
>> >
>>
>

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