By default Net::Ping does a tcp ping. Normal OS pings are usually ICMP. You could try allowing inbound port number 7 to make the TCP Net::Ping work or 
 $p = Net::Ping->new("icmp");

[download]
to make your Net::Ping use ICMP protocol.

In reply to Re: Ping and Linux firewall by trippledubs
in thread Ping and Linux firewall by BrianDStark

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