[libvirt-users] Help with Vrbr0

[Sherin A]

On Friday 22 November 2013 01:24 PM, Gao feng wrote:
> On 11/22/2013 03:47 PM, Sherin A wrote:
>> Hello,
>>
>>   I am not able to see  vrbr0  in my  box. Can  some one help me with this ? . I am trying KVM+libvirt   and planing to use Routed mode. I hope this virbr0 must be up for using this .  I can give an
>> strace too.
>>
>> OS : Debian , kernel 3.12.0
>> libvrit version :  0.9.8
>> ____________________________________________________________________
>> root@:~# ifconfig
>> br0       Link encap:Ethernet  HWaddr 4c:72:b9:32:32:86
>>            inet addr:10.0.0.12  Bcast:10.0.0.255  Mask:255.255.255.0
>>            inet6 addr: fe80::4e72:b9ff:fe32:3286/64 Scope:Link
>>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>            RX packets:4523 errors:0 dropped:0 overruns:0 frame:0
>>            TX packets:4068 errors:0 dropped:0 overruns:0 carrier:0
>>            collisions:0 txqueuelen:0
>>            RX bytes:2286336 (2.2 MB)  TX bytes:411238 (411.2 KB)
>>
>> eth0      Link encap:Ethernet  HWaddr 4c:72:b9:32:32:86
>>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>            RX packets:17044 errors:0 dropped:0 overruns:0 frame:0
>>            TX packets:14253 errors:0 dropped:0 overruns:0 carrier:0
>>            collisions:0 txqueuelen:1000
>>            RX bytes:12594945 (12.5 MB)  TX bytes:1902456 (1.9 MB)
>>            Interrupt:20 Memory:f7c00000-f7c20000
>>
>> 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:65536  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:240 (240.0 B)  TX bytes:240 (240.0 B)
>>
>> -------------------------------------------------------------------
>> root@:~# virsh net-start default
>> error: Failed to start network default
>> error: failed to add iptables rule to enable masquerading
>>
>> root@:~# virsh net-list --all
>> Name                 State      Autostart
>> -----------------------------------------
>> default              inactive   yes
>>
>> root@:~#  virsh net-start default
>> error: Failed to start network default
>> error: failed to add iptables rule to enable masquerading
>>
> seems like your kernel doesn't have ipt_MASQUERADE installed.
> try modprobe ipt_MASQUERADE
>
Hi Gao,


  Yes , it  looks like I am missing more module. I will recompile the 
kernel and test more, the following is  the reason behind this issue.

root@:~# tail /var/log/libvirt/libvirtd.log
2013-11-22 07:43:06.388+0000: 4328: error : virCommandWait:2192 : 
internal error Child process (/sbin/iptables --table nat --insert 
POSTROUTING --source 192.168.122.0/24 ! --destination 192.168.122.0/24 
--jump MASQUERADE) status unexpected: exit status 3
2013-11-22 07:43:06.388+0000: 4328: error : 
networkAddMasqueradingIptablesRules:966 : failed to add iptables rule to 
enable masquerading

root@:~# /sbin/iptables --table nat --insert POSTROUTING --source 
192.168.122.0/24 ! --destination 192.168.122.0/24 --jump MASQUERADE
iptables v1.4.12: can't initialize iptables table `nat': Table does not 
exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
root@# find /lib/modules/`uname -r` -iname "ipt*.ko"
/lib/modules/3.12.0-zilonus/kernel/net/ipv4/netfilter/ipt_ULOG.ko
/lib/modules/3.12.0-zilonus/kernel/net/ipv4/netfilter/ipt_REJECT.ko
/lib/modules/3.12.0-zilonus/kernel/net/ipv4/netfilter/iptable_raw.ko
/lib/modules/3.12.0-zilonus/kernel/net/ipv4/netfilter/iptable_filter.ko
/lib/modules/3.12.0-zilonus/kernel/net/ipv4/netfilter/ipt_CLUSTERIP.ko
/lib/modules/3.12.0-zilonus/kernel/net/ipv4/netfilter/ipt_ah.ko
/lib/modules/3.12.0-zilonus/kernel/net/ipv4/netfilter/iptable_mangle.ko
/lib/modules/3.12.0-zilonus/kernel/net/ipv4/netfilter/iptable_security.ko
/lib/modules/3.12.0-zilonus/kernel/net/ipv4/netfilter/ipt_ECN.ko
root@~#
root at myhome:~# lsmod | grep ipt
ipt_REJECT             12541  0
iptable_mangle         12695  0
iptable_filter         12810  0
ip_tables              26952  2 iptable_mangle,iptable_filter
x_tables               29804  11 
xt_physdev,ip6table_filter,ip6_tables,ebtables,xt_state,ipt_REJECT,xt_CHECKSUM,iptable_mangle,xt_tcpudp,iptable_filter,ip_tables
root@:~# modinfo iptable_nat
ERROR: modinfo: could not find module iptable_nat
root@:~#

I will compile the kernel and get back soon.

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Sherin A
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