punchy configures the sending of inbound/outbound packets at a regular interval to avoid expiration of firewall nat
punch enables its functionality, which causes the node to send small packets at the regular interval.
respond means that a node unable to receive handshakes will attempt to initiate a handshake to the host attempting to
establish a tunnel, which can be the case when hole punching fails in one direction. This can be extremely useful if one
node is behind a difficult nat, such as a symmetric NAT.
delay slows down punch responses which can be helpful for conditions where a NAT is unable to handle certain race
respond must be true to take effect. Changing this value while running will not affect any in progress
operations, only new ones.