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openstack: instance cannot connect to internet

asked 2014-04-08 01:27:21 -0500

rohitist gravatar image


I have one confusing question here and i could not find related question on the internet.

I am trying Openstack all in one installation using Packstack. Everything is fine. I can create an instance and connect on the internet. But the peculiarity arises when i create an another instance. The other instance cannot connect or ping to the internet (say ). From the other instance, i can ping the host machine, the private and public IP of the virtual router, the other instance, our infrastructure DNS, gateway, etc.

you can see my network topology below:

image description

Can anyone please help me out in this case?

Thanks in advance.

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Are you able to SSH into the second instance with the floating IP address? Did you use the same security group for the second instance?

mpetason gravatar imagempetason ( 2014-04-08 06:05:21 -0500 )edit

@mpetason: Yes, I am able to do all :( Any more suggestion please.

rohitist gravatar imagerohitist ( 2014-04-08 06:40:06 -0500 )edit

Did your instance receive DNS from the DHCP server. Does it show DNS in /etc/resolv.conf? You said you can hit it, but did it actually save the data? If you run "host"(on the other instance) and try to ping the IP address of a google server(on problem instance) are you able to?

mpetason gravatar imagempetason ( 2014-04-08 06:43:40 -0500 )edit

Yes, I am able to hit DNS (private and public also).

Below is the trace from the problem instance:

[root@host-10-0-0-2 ~]# ping PING ( 56(84) bytes of data. 64 bytes from icmp_seq=1 ttl=64 time=0.219 ms 64 bytes from icmp_seq=2 ttl=64 time=0.174 ms ^C --- ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1870ms rtt min/avg/max/mdev = 0.174/0.196/0.219/0.026 ms [root@host-10-0-0-2 ~]# [root@host-10-0-0-2 ~]#

[root@host-10-0-0-2 ~]# ping PING ( 56(84) bytes of data. 64 bytes from icmp_seq=1 ttl=126 time=0.497 ms 64 bytes from icmp_seq=2 ...(more)

rohitist gravatar imagerohitist ( 2014-04-08 06:55:10 -0500 )edit

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answered 2014-04-09 00:46:30 -0500

rohitist gravatar image

My bad... like most of my questions, I again resolved this. I was too careless to check my organizations's firewall rules ;)

Anyway, thanks for your input. :)

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Asked: 2014-04-08 01:27:21 -0500

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Last updated: Apr 09 '14