As many people know, Ubuntu supports IPv6 by default.
It's nice but sometimes you don't have chance to use IPv6 in your network environment.
And maybe, sometimes it brings few more complexity for your system administration tasks.
For example, if you set [i]listen_ip=0.0.0.0:80[/i] in a services daemon's config file and hope it can listen to all of the IPv4 IPs of your network interfaces, you might not get what you want.
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