I am integrating avahi-client in a Linux application to publish a TCP-based service on two separate local networks, each on their own interface. Since the service uses the ephemeral TCP port range, the listening port on network #1 and network #2 will almost always be different, so I want to add the service on each network/interface individually as to publish the right port number. It appears avahi_entry_group_add_service() can take an interface index argument for this purpose; how can I look up the index for a given interface/network on my system?
Thanks, Peter Shilliday
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