Robert: I thinkg we'd need to see many interations oscilating between name vs IP, to make a reasonable conlusion.
Effectively any one single packet could have taken significanlty longer. The reason could be any compounded number of things. i.e. if foo were low on memory the act of freeing / releasing / swaping out the gethostbyname (not the DNS lookup) to free up memory to update the arp table and respond, freeing buffer cache. Then any other network traffic; WINS broadcasts, etc. pinging localhost v 127.0.0.1 my also eliminate extranious anomilies too. I thing ping v name vs ping v IP is only an anomily. In my tests the diff between IP v name where nominal: [EMAIL PROTECTED] ~]# ping -f -c 1000 occam599 PING occam599 (10.144.24.156) 56(84) bytes of data. --- occam599 ping statistics --- 1000 packets transmitted, 1000 received, 0% packet loss, time 16333ms rtt min/avg/max/mdev = 0.007/0.010/0.067/0.005 ms, pipe 2, ipg/ewma 16.350/0.010 ms [EMAIL PROTECTED] ~]# ping -f -c 1000 10.144.24.156 PING 10.144.24.156 (10.144.24.156) 56(84) bytes of data. --- 10.144.24.156 ping statistics --- 1000 packets transmitted, 1000 received, 0% packet loss, time 15978ms rtt min/avg/max/mdev = 0.007/0.009/0.069/0.004 ms, pipe 2, ipg/ewma 15.994/0.009 ms [EMAIL PROTECTED] ~]# ping -f -c 1000 10.144.24.156 PING 10.144.24.156 (10.144.24.156) 56(84) bytes of data. --- 10.144.24.156 ping statistics --- 1000 packets transmitted, 1000 received, 0% packet loss, time 15845ms rtt min/avg/max/mdev = 0.007/0.009/0.037/0.003 ms, pipe 2, ipg/ewma 15.860/0.010 ms [EMAIL PROTECTED] ~]# ping -f -c 1000 occam599 PING occam599 (10.144.24.156) 56(84) bytes of data. --- occam599 ping statistics --- 1000 packets transmitted, 1000 received, 0% packet loss, time 15832ms rtt min/avg/max/mdev = 0.007/0.009/0.059/0.003 ms, pipe 2, ipg/ewma 15.848/0.008 ms Cheers; E! > > What's wrong with this picture? > > Notice the time if I ping a machine by IP address: > > $ ping -f -c 1000 10.4.0.4 > PING 10.4.0.4 (10.4.0.4) 56(84) bytes of data. > --- 10.4.0.4 ping statistics --- > 1000 packets transmitted, 1000 received, 0% packet loss, time 383ms > rtt min/avg/max/mdev = 0.086/0.332/29.934/2.000 ms, pipe 2, ipg/ewma > 0.384/3.827 ms > > Now, notice the time if I ping by name: > > $ ping -f -c 1000 foo > PING foo.com (10.4.0.4) 56(84) bytes of data. > --- foo.com ping statistics --- > 1000 packets transmitted, 1000 received, 0% packet loss, time 24598ms > rtt min/avg/max/mdev = 0.092/0.100/0.133/0.010 ms, ipg/ewma > 24.622/0.100 ms > > A 64 fold increase in the amount of time. > > Any thoughts? > > Regards, > - Robert > http://www.cwelug.org/downloads > Help others get OpenSource software. Distribute FLOSS > for Windows, Linux, *BSD, and MacOS X with BitTorrent > > > > _______________________________________________ > CWE-LUG mailing list > [email protected] > http://www.cwelug.org/ > http://www.cwelug.org/archives/ > http://www.cwelug.org/mailinglist/ > > > _______________________________________________ CWE-LUG mailing list [email protected] http://www.cwelug.org/ http://www.cwelug.org/archives/ http://www.cwelug.org/mailinglist/
