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The operating system installed on the instance can make a difference on how it responds to network issues as well. For example, when an instance loses a DHCP address, Ubuntu typically continues to retry renewing the DHCP address. When the network issues are resolved, the renewal process succeeds and the IP address is restored. However, RedHat and CentOS are commonly configured by default to give up after the renewal process fails, which means that even if the network issues are resolved, the instance is no longer attempting to renew the DHCP lease and permanently stays off the network
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