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Bind querys public nameserver gets private IP as answer

Currently I have a dnsmasq server (192.168.0.53) answering with local IP addresses for queries to a public domain. Facing internet there is an old (really old) bind server, master for example.com. So ...
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Set host firewall so VMs obtain dynamic IP from dnsmasq

Virtual machines (KVM/libvirt) fail to obtain a dynamic IP address from the libvirt-launched dnsmasq running on a CentOS host when the firewall is running. When I turn off the firewall (CSF), the ...