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Hi JoeJiang, 

I tried pinging 8.8.8.8 net unreachable problem. 
I am not sure as you pointed out my nameserver Moxie.corp is causing any issues. But on host machine nameserver is same but I am able to ping google, or is nat ing masquedre is not happening properly ?
just confused at hte moment . 

 
Regards
Neelu 

     On Tuesday, 30 December 2014 8:23 PM, joejiang <ifzing at 126.com> wrote:
   

 
Hi somshekar,Maybe you can ping 8.8.8.8 or any other open dns ip to verify it, or check your nameserver isn't correctly? 



At 2014-12-29 22:51:40, "somshekar kadam" <som_kadam at yahoo.co.in> wrote:
 
Hello All, 

I have openstack instance able to ping compute/controller and other hosts in the network. 
Not able to ping google.com 
My external network is 10.10.126.xx
able to ping 10.10.126.1 gateway 

able to ping host controller 10.10.126.62 which also nova compute 
able to ping other hosts 10.10.126.54 and other machines in network. 
able to ping br100 and virbr0
enabled /etc/sysctl.conf to contain the following:net.ipv4.ip_forward=1and also enabled masquerading in the iptablesiptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
internal IP of instance is 10.4.128.2 and floating IP assigned is 10.10.126.129 
On instance route command 
[root at newtry fedora]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.4.128.3      0.0.0.0         UG    0      0        0 eth0
10.4.128.0      0.0.0.0         255.255.240.0   U     0      0        0 eth0
[root at newtry fedora]# 

on the controller machine 
stack at celestial-PC-1:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 wlan0
10.4.128.0      0.0.0.0         255.255.240.0   U     0      0        0 br100
10.10.126.0     0.0.0.0         255.255.255.0   U     0      0        0 br100
192.168.1.0     0.0.0.0         255.255.255.0   U     9      0        0 wlan0
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0
stack at celestial-PC-1:~$ 



on instance 
[root at newtry fedora]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether fa:16:3e:20:e6:e5 brd ff:ff:ff:ff:ff:ff
    inet 10.4.128.2/20 brd 10.4.143.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:fe20:e6e5/64 scope link 
       valid_lft forever preferred_lft forever
[root at newtry fedora]# 

 what is missing not able to ping google.com from instance 
please help on this with your valuable suggestions 

thanks in advance 


Regards
Neelu


    




   
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