Andy Shellam (Mailing Lists) wrote: > Why do you need to make a "0 byte" ping? (I'm not particularly up on > networking, but a 0 byte ping would in theory send nothing, right?) >
No, it would send the IP and ICMP headers, but with a 0-byte data part of the icmp echo request. > Tried doing this on my Fedora system, and you still get a minimum of 8 > bytes back: > > /bin/ping -s 0 www.google.com > PING www.l.google.com (216.239.59.99) 0(28) bytes of data. > 8 bytes from 216.239.59.99: icmp_seq=1 ttl=243 > That is the struct timeval that ping includes after the ICMP header. 8 bytes of data is the absolute minimum to send in an ICMP packet. It's normally defined as ICMP_MINLEN in /usr/include/netinet/ip_icmp.h. -- Andreas Ericsson [EMAIL PROTECTED] OP5 AB www.op5.se Tel: +46 8-230225 Fax: +46 8-230231 ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Nagios-users mailing list Nagios-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nagios-users ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null
