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Because the container called "web" now has two interfaces. 1 static, 1 we still want to assign through dnsmasq. In order for dnsmasq to know which interface to use you, must now specify by using the mac address contained in the /var/lib/lxc/[container]/config.
You need to shutdown containers and restart the host or flush the DNS Masq,
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Multiple Interfaces
In most cases you will want multiple interfaces. In this example, we built a front-end container called "web", gave it a public IP address using mavlan. In addition, we create an "app" container which has an lxc internal IP address. In order for web and app to communicate, web must have a second interface that also uses an lxc provided internal IP address.
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