On Sun, Dec 22, 2002 at 10:52:35PM -0800, Matthew Dillon wrote: > > : > :Hmm, same cables, same switch, different card, now it all works. > : > :I did do some ICMP ping testing with ping -f and only lost 3 > :packets after letting it run for a good 10s. > : > : > :-matt > > If it is working properly you should not lose *ANY* packets on an > otherwise idle connection, except possibly the last one that the > ping was sending when you ^C'd it (and sometimes ping doesn't wait > long enough on the last packet when you give it a specific count). > So at most it should report one lost packet over any period of time. > Certainly not 3. > > e.g. > workstation# ping -c 1000 -i 0.05 apollo > ... > 1000 packets transmitted, 1000 packets received, 0% packet loss > round-trip min/avg/max/stddev = 0.148/0.159/0.248/0.009 ms > Then how could you explain that ``ping -c 1000 -i 0 localhost'' sometimes exhibits the loss? I've bitten my head today trying to figure out what's going on here (5.0-CURRENT), to no avail.
This is with net.inet.icmp.icmplim and net.inet.icmp.icmplim_output both set to zero, and with only lo0 interface ``up''. (Yes I know that -i should not allow 0, even for root.) The sendto(2) call in ping.c:pinger() always succeeds, yet ``netstat -s -p icmp'' shows the same delta as ping(8)? allmouth# netstat -z -s -p icmp > /dev/null allmouth# netstat -s -p icmp > 1 allmouth# ping -i0 -c1000 localhost | tail -3 --- localhost ping statistics --- 1000 packets transmitted, 217 packets received, 78% packet loss round-trip min/avg/max/stddev = 0.063/6.769/30.353/12.241 ms allmouth# netstat -s -p icmp > 2 allmouth# diff 1 2 3a4,5 > Output histogram: > echo reply: 217 10c12,15 < 0 message responses generated --- > Input histogram: > echo reply: 217 > echo: 217 > 217 message responses generated Cheers, -- Ruslan Ermilov Sysadmin and DBA, [EMAIL PROTECTED] Sunbay Software AG, [EMAIL PROTECTED] FreeBSD committer, +380.652.512.251 Simferopol, Ukraine http://www.FreeBSD.org The Power To Serve http://www.oracle.com Enabling The Information Age
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