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Fix IPv4 nodes not being able to connect to IPv4/IPv6 dual stack nodes

Christopher Schinnerl requested to merge gateway-ipv6-broadcast-fix into master

Created by: ChrisSchinnerl

It seems like nodes still used the remoteHeader to add nodes. Dual stack nodes will put their IPv6 address into that header which prevents IPv4 nodes from pinging them. This PR changes that to make sure IPv4 nodes use the connection's IP address to ping the node.

This should also fix #2735.

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