-i, --interface=<interface name>

Listen only on the specified interface(s). Dnsmasq automatically adds the loopback (local) interface to the list of interfaces to use when the --interface option is used. If no --interface or --listen-address options are given dnsmasq listens on all available interfaces except any given in --except-interface options. On Linux, when --bind-interfaces or --bind-dynamic are in effect, IP alias interface labels (eg "eth1:0") are checked, rather than interface names. In the degenerate case when an interface has one address, this amounts to the same thing but when an interface has multiple addresses it allows control over which of those addresses are accepted. The same effect is achievable in default mode by using --listen-address. A simple wildcard, consisting of a trailing '*', can be used in --interface and --except-interface options.