I want to know peer ip is alive or not.

If you know the peer IP addresses, use Net::Ping module to ping set of IP addresses,

Ex,

    use Net::Ping;

    my $p = Net::Ping->new("icmp");
    my @host_array = (IP1,IP2,IP3...);

    foreach $host (@host_array)
    {
        print "$host is ";
        print "NOT " unless $p->ping($host, 2);
        print "reachable.\n";
        sleep(1);
    }
    $p->close();

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All is well. I learn by answering your questions...

In reply to Re: How to use "$ssh->before()" by vinoth.ree
in thread How to use "$ssh->before()" by hxbsy

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