external IP subnet is not in same subnet with main server IP

asked 2020-05-16 07:11:54 -0500

ebrahimtavasoli gravatar image

updated 2020-05-16 08:52:34 -0500


I installed OpenStack 'train' in Centos 7.8 by packstack. All thing goes well so I could run an instance and access it from their namespace but the instance has not connected to the internet and I can't ping it or access it from outside of the namespace whether in host server or another device.

Server IP is in /27 subnet but the public IPs that I used for instances are in /29 subnet.

After the OpenStack installed, it broke down my network to some subnets and bridges.

I used IP route add ZZZ.ZZZ.ZZZ.ZZZ/29 via XXX.XXX.XXX.XXX (XXX.XXX.XXX.XXX means the main server ip and ZZZ.ZZZ.ZZZ.ZZZ/29 public subnet for instances) but still I have a problem.

please help me

thanks a lot

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