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dnsmasq 2.84

    1: The script reads stdin and replaces all IP addresses with names before
    2: outputting it again. IPs from private networks are reverse looked  up
    3: via dns. Other IP addresses are searched for in the dnsmasq query log.
    4: This gives names (CNAMEs if I understand DNS correctly) that are closer
    5: to the name the client originally asked for then the names obtained by
    6: reverse lookup. Just run
    7: 
    8: netstat -n -4 | ./reverse_replace.sh 
    9: 
   10: to see what it does. It needs 
   11: 
   12: log-queries
   13: log-facility=/var/log/dnsmasq.log
   14: 
   15: in the dnsmasq configuration.
   16: 
   17: The script runs on debian (with dash installed) and on busybox.
   18: