Re: Net::ping is very unstable

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Re^2: Net::ping is very unstable by hxbsy (Novice) on Apr 09, 2015 at 11:41 UTC
the host is pingable by OS's "ping" command,but not pingable by this script. but some hosts in other net is pingable by this script.	[reply]
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
Re^6: Net::ping is very unstable by hxbsy (Novice) on Apr 09, 2015 at 12:26 UTC
Some notes below your chosen depth have not been shown here
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]