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In my instances' log files, i saw network start line.

Starting network...
udhcpc (v1.20.1) started
Sending discover...
Sending select for 10.0.0.2...
Lease of 10.0.0.2 obtained, lease time 120
deleting routers
adding dns 10.0.0.1
check-version already run per instance
Starting dropbear sshd: OK
userdata already run per instance

this is normal, but when i restart this images or sometimes after launch new instance, in it's log file there are these lines.

Starting network...
udhcpc (v1.20.1) started
Sending discover...
Sending select for 10.0.0.2...
Received DHCP NAK
Sending discover...
Sending select for 192.168.177.140...
Lease of 192.168.177.140 obtained, lease time 1800
deleting routers
adding dns 192.168.177.2
check-version already run per instance
Starting dropbear sshd: OK
userdata already run per instance

when instance get ip like 192.168.177.x i cant ping it from host (host ip is 10.0.0.1), i think it's in different subnet. But if it's ip 10.0.0.x i can ping it.

How can i solve this ? Why i get nak issue ? I investigated it in ask.openstack forum and another sites all day but i couldnt find a solution. Can anyone help me ? Thanks.