How to see whether a v4-mapped-on-v6 address is used for a listen socket?

Solution Unverified - Updated -

Issue

  • How to see whether a v4-mapped-on-v6 address is used for a listen socket?

For example, httpd listens using an ipv6 address as follows:

# netstat -antp | egrep "^Proto|:80"
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp6       0      0 :::80                   :::*                    LISTEN      3317/httpd

However we can connect to the ipv4 address, since it is a v4-mapped-on-v6 address. See man IPV6(7) for details.

Environment

  • Red Hat Enterprise Linux 7
  • httpd

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