Pinging behind my natted ISP conection (AS22566), seems to work: $ ping 65.5.48.2 PING 65.5.48.2 (65.5.48.2) 56(84) bytes of data. 64 bytes from 65.5.48.2: icmp_seq=1 ttl=240 time=72.5 ms 64 bytes from 65.5.48.2: icmp_seq=2 ttl=240 time=72.9 ms 64 bytes from 65.5.48.2: icmp_seq=3 ttl=240 time=73.4 ms 64 bytes from 65.5.48.2: icmp_seq=4 ttl=240 time=73.4 ms ^C --- 65.5.48.2 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3004ms rtt min/avg/max/mdev = 72.528/73.076/73.455/0.428 ms But when tracing that IP a lot of hops doesn't respond: $ traceroute 65.5.48.2 traceroute to 65.5.48.2 (65.5.48.2), 30 hops max, 60 byte packets 1 10.206.0.3 (10.206.0.3) 7.266 ms 7.459 ms 7.674 ms 2 10.12.1.2 (10.12.1.2) 11.622 ms 11.818 ms 12.283 ms 3 10.10.1.154 (10.10.1.154) 12.508 ms 13.473 ms 16.941 ms 4 63.221.133.1 (63.221.133.1) 16.978 ms 17.111 ms 17.327 ms 5 so-4-1-0.gar1.Houston1.Level3.net (4.59.122.13) 52.272 ms 55.217 ms 55.437 ms 6 ae-3-16.bar1.Houston1.Level3.net (4.69.140.205) 51.994 ms 39.478 ms 39.523 ms 7 ae-13-13.ebr1.Dallas1.Level3.net (4.69.137.138) 48.342 ms 48.558 ms 48.606 ms 8 ae-61-61.csw1.Dallas1.Level3.net (4.69.151.125) 49.114 ms ae-71-71.csw2.Dallas1.Level3.net (4.69.151.137) 49.169 ms ae-61-61.csw1.Dallas1.Level3.net (4.69.151.125) 49.251 ms 9 ae-4-90.edge10.Dallas1.Level3.net (4.69.145.210) 50.239 ms 53.285 ms ae-1-60.edge10.Dallas1.Level3.net (4.69.145.18) 53.336 ms 10 ATT (4.68.62.230) 53.556 ms 54.032 ms 55.245 ms 11 cr1.dlstx.ip.att.net (12.122.212.10) 74.479 ms 74.929 ms 77.851 ms 12 cr2.hs1tx.ip.att.net (12.122.28.158) 62.983 ms 63.210 ms 62.959 ms 13 cr1.hs1tx.ip.att.net (12.122.5.189) 63.661 ms 64.389 ms 64.858 ms 14 cr1.nwrla.ip.att.net (12.122.1.142) 67.812 ms 68.243 ms 68.455 ms 15 gar3.brhal.ip.att.net (12.122.100.85) 68.652 ms 68.881 ms 69.105 ms 16 12.248.15.46 (12.248.15.46) 79.204 ms 82.829 ms 82.894 ms 17 * * * 18 * * * 19 * * * 20 * * * 21 * * * 22 * * * 23 * * * 24 * * * 25 * * * 26 * * * 27 * * * 28 * * * 29 * * * 30 * * *

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Message: 2 Date: Thu, 23 Jun 2011 08:07:40 -0500 From: Eric J Esslinger <eesslinger@fpu-tn.com> Subject: ping me please... To: "'nanog@nanog.org'" <nanog@nanog.org> Message-ID: <D2D37F15EBBD524693E9F3CB32D0208021CDA92C8F@exchange.corp.fpu-tn.com> Content-Type: text/plain; charset="us-ascii"

I have just turned up and migrated to a new circuit. I'm getting a few reports from one customer that some of his users are unable to reach his system. If I could get people on the list to ping 65.5.48.2, and if it fails, to do a traceroute and email it to me offlist? I'd appreciate it. Thanks. __________________________ Eric Esslinger Information Services Manager - Fayetteville Public Utilities http://www.fpu-tn.com/ (931)433-1522 ext 165

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-- Daniel Espejel Perez