On 9/17/08, ashutosh mehra <mehra.ashutosh@xxxxxxxxx> wrote:
> 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.
Try two things
1. Look at tcpdump in dom0 tcpdump -i peth0. Start a ping from domU to
gw. Now ping from domU to external network. Comapre the difference.
2. Add the masquerading rule in dom0, to see if it works.
/sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
see if it helps.
>
> 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_poweroff = 'destroy'
>> >> > 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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