Re^2: Net::ping is very unstable

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Re^3: Net::ping is very unstable by Corion (Patriarch) on Apr 09, 2015 at 11:50 UTC
The `ping` command sends `ICMP` packets. Your code sends `SYN` packets and expects `ACK` replies. I recommend you consult with your network administrator how to best check the connectivity between hosts on your network.	[reply] [d/l] [select]
Re^4: Net::ping is very unstable by hxbsy (Novice) on Apr 09, 2015 at 12:10 UTC
I see.but I use "Net::Ping->new('icmp');",the script runs very slowly. in fact I check whether remote host opens specific port or not.for speed,I first have to use "Net::Ping" to check the host is alive or not. Can you give better advice?	[reply]
Re^5: Net::ping is very unstable by Corion (Patriarch) on Apr 09, 2015 at 12:14 UTC
If the Ping reply comes slowly, there is no way around that. If you want to ping more than one host, maybe you can parallelize the pings, for example using AnyEvent::Ping or Parallel::ForkManager or threads.	[reply]
Re^6: Net::ping is very unstable by hxbsy (Novice) on Apr 09, 2015 at 12:26 UTC
Re^7: Net::ping is very unstable by Corion (Patriarch) on Apr 09, 2015 at 12:31 UTC
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Re^3: Net::ping is very unstable by basiliscos (Pilgrim) on Apr 12, 2015 at 08:33 UTC
You can try to use Net::Ping::External, which actually invokes ping command. Creation of ICMP-packets requires special privileges on some systems (e.g. suid on linux), so, it is a bit not-convenient to use ICMP-protocol from perl. ping command already has that privilege/capability, and it is more-or-less safe to use it from security point of view. WBR, basiliscos.	[reply]