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Re: ping packet loss when size gt 1500



Morgan Gangwere on 16/10/10 21:14, wrote:
On Sat, 16 Oct 2010 20:11:46 +0100 Adam Hardy <> wrote:

[stuff]

Nope you're not the only one:

( 4:~ )%ping -s 1473 208.245.107.9
PING 208.245.107.9 (208.245.107.9) 1473(1501) bytes of data.
^C --- 208.245.107.9 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3022ms

Keep discovering things that might be relevant.

If I do a tracert (which I just found out is traceroute -I, where -I means "use ICMP ECHO for probes" I can get a traceroute to the server:

adam@isengard:~/tmp$ sudo tracert 208.245.107.9
[sudo] password for adam:
traceroute to 208.245.107.9 (208.245.107.9), 30 hops max, 40 byte packets
 1  * * *
 2  * * *
 3  * * *
 4  * * *
 5  * 213.120.176.58 (213.120.176.58)  23.992 ms  24.841 ms
 6  213.120.176.182 (213.120.176.182)  26.152 ms  6.453 ms  6.358 ms
7 acc1-10GigE-0-7-0-5.l-far.21cn-ipp.bt.net (109.159.249.214) 6.353 ms 6.134 ms 6.736 ms 8 core2-te0-14-4-0.ealing.ukcore.bt.net (109.159.249.157) 9.568 ms 7.570 ms 7.895 ms 9 transit2-xe0-1-0.ealing.ukcore.bt.net (194.72.17.82) 7.092 ms 7.070 ms 7.097 ms
10  t2c2-ge13-0-0.uk-eal.eu.bt.net (166.49.168.53)  7.122 ms  6.775 ms  7.682 ms
11  so-6-0-2.edge1.London2.Level3.net (212.113.11.253)  7.830 ms  7.052 ms  7.345 ms
12 ae-32-52.ebr2.London2.Level3.net (4.68.117.62) 9.553 ms ae-32-54.ebr2.London2.Level3.net (4.68.117.126) 8.178 ms 7.863 ms
13  ae-3-3.ebr1.London1.Level3.net (4.69.141.189)  7.854 ms  7.405 ms  7.697 ms
14  ae-100-100.ebr2.London1.Level3.net (4.69.141.166)  8.307 ms  8.318 ms  7.832 ms
15  ae-43-43.ebr1.NewYork1.Level3.net (4.69.137.74)  76.600 ms  75.925 ms  76.088 ms
16  ae-4-4.ebr1.NewYork2.Level3.net (4.69.141.18)  82.571 ms  81.033 ms  80.071 ms
17 ae-1-51.edge2.NewYork2.Level3.net (4.69.138.195) 76.163 ms 76.807 ms 78.007 ms 18 mci-level3-xe.newyork2.Level3.net (4.68.110.234) 75.640 ms 75.359 ms 75.371 ms
19  0.ae2.XL4.NYC4.ALTER.NET (152.63.3.117)  76.439 ms  76.328 ms  75.984 ms
20  0.so-7-1-0.XL4.BOS4.ALTER.NET (152.63.0.221)  83.696 ms  84.207 ms  84.064 ms
21  POS7-0-0.GW12.BOS4.ALTER.NET (152.63.22.181)  83.920 ms  83.924 ms  83.927 ms
22 interactivebrokers-gw.customer.alter.net (208.192.181.62) 91.797 ms 91.843 ms 91.479 ms
23  mktgw1.ibllc.com (208.245.107.9)  91.550 ms  91.443 ms  91.647 ms


but if I use plain vanilla traceroute, it doesn't make the last hop:

adam@isengard:~/tmp$ sudo traceroute 208.245.107.9
traceroute to 208.245.107.9 (208.245.107.9), 30 hops max, 40 byte packets
 1  192.168.1.1 (192.168.1.1)  0.784 ms  2.980 ms  2.963 ms
 2  217.32.146.168 (217.32.146.168)  7.049 ms  7.743 ms  8.640 ms
 3  217.32.146.222 (217.32.146.222)  10.317 ms  10.774 ms  11.482 ms
 4  213.120.177.58 (213.120.177.58)  12.197 ms  12.930 ms  13.865 ms
 5  213.120.176.58 (213.120.176.58)  14.331 ms  14.797 ms *
 6  213.120.176.182 (213.120.176.182)  16.956 ms  6.904 ms  6.828 ms
7 109.159.249.227 (109.159.249.227) 7.831 ms 8.143 ms 109.159.249.231 (109.159.249.231) 9.273 ms 8 core2-te0-14-4-0.ealing.ukcore.bt.net (109.159.249.157) 11.274 ms 109.159.249.149 (109.159.249.149) 11.918 ms core2-te0-15-0-2.ealing.ukcore.bt.net (109.159.249.161) 12.702 ms 9 transit2-xe0-1-0.ealing.ukcore.bt.net (194.72.17.82) 13.146 ms 13.796 ms 14.487 ms
10  t2c2-ge11-0-0.uk-eal.eu.bt.net (166.49.168.61)  15.211 ms  15.661 ms  16.845 ms
11 so-6-0-2.edge1.London2.Level3.net (212.113.11.253) 18.295 ms 20.230 ms 20.443 ms
12  ae-32-54.ebr2.London2.Level3.net (4.68.117.126)  15.073 ms  13.801 ms  8.207 ms
13  ae-3-3.ebr1.London1.Level3.net (4.69.141.189)  8.329 ms  9.897 ms  10.014 ms
14 ae-100-100.ebr2.London1.Level3.net (4.69.141.166) 10.912 ms 11.998 ms 12.871 ms 15 ae-43-43.ebr1.NewYork1.Level3.net (4.69.137.74) 81.782 ms ae-44-44.ebr1.NewYork1.Level3.net (4.69.137.78) 82.138 ms ae-43-43.ebr1.NewYork1.Level3.net (4.69.137.74) 83.191 ms
16  ae-4-4.ebr1.NewYork2.Level3.net (4.69.141.18)  84.379 ms  85.015 ms  85.782 ms
17 ae-1-51.edge2.NewYork2.Level3.net (4.69.138.195) 86.569 ms 86.918 ms 88.560 ms 18 mci-level3-xe.newyork2.Level3.net (4.68.110.234) 81.004 ms mci-level3-xe.newyork2.Level3.net (4.68.110.106) 82.624 ms 4.68.110.70 (4.68.110.70) 102.214 ms 19 0.ae3.XL4.NYC4.ALTER.NET (152.63.16.186) 80.748 ms 80.986 ms 0.ae2.XL4.NYC4.ALTER.NET (152.63.3.117) 81.313 ms
20  0.so-7-1-0.XL3.BOS4.ALTER.NET (152.63.0.209)  108.770 ms  84.001 ms  84.425 ms
21  POS6-0-0.GW12.BOS4.ALTER.NET (152.63.22.177)  84.149 ms  83.413 ms  84.180 ms
22 interactivebrokers-gw.customer.alter.net (208.192.181.62) 92.495 ms 92.240 ms 92.509 ms
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *


is this useful or is this just irrelevant?

Thanks!
Adam


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