Question is in the title. Is it possible that a dual-stack socket binds to one specific IPv6 address and another specific IPv4 address? Or do dual-stack sockets always need to bind to ::/0.0.0.0?
Can dual-stack sockets bind to specific IPv6 and IPv4 addresses?
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To listen on specific addresses you always need to create separate sockets and listen on all of them.
PS: Binding to
::usually gives you a dual-stack socket that listens on all IPv4 and IPv6 addresses, but not always. It depends on the setting of theIPV6_V6ONLYsocket option.