connectivity to bkbits.net?

connectivity to bkbits.net?

Post by Petr Vandrove » Sat, 30 Nov 2002 00:10:06





> > >From two or three traceroutes, that problem seems to be at the SGI end. I  
> > can't get to them either (nothing after the same IP as for you, at hop  
> > #17, some place at Genuity), but you are practically next door.

> Lesson #1 of firewalling: drop everything.
> Lesson #2 of firewalling: only accept what you absolutely have to.

> Try pointing a web browser at sgi.com port 80.  I _bet_ you get a
> response.  The site is reachable, they just block UDP (and probably
> a lot of other stuff.)

> traceroute uses UDP, so if a site drops UDP (rather than blocking it)
> it will appear as a black hole.

Fortunately people do not sleep, and Michael C. Toren invented
tcptraceroute, so you get same level of diagnostic, but by using
TCP instead of UDP probe... Very useful these days, as almost all
sites have TCP port 80 open ;-)
                                            Petr Vandrovec

vana:/mnt2$ tcptraceroute www.sgi.com
Selected device eth0, address 147.32.240.58, port 34029 for outgoing packets
Tracing the path to www.sgi.com (128.167.58.40) on TCP port 80, 30 hops max
 1  vc-gw.cvut.cz (147.32.240.254)  1.321 ms  1.153 ms  6.154 ms
 2  147.32.253.80 (147.32.253.80)  0.423 ms  0.339 ms  0.307 ms
 3  195.113.144.173 (195.113.144.173)  0.419 ms  0.372 ms  0.321 ms
 4  r41prg-pos13-0-stm16.cesnet.cz (195.113.156.110)  0.559 ms  0.635 ms  0.647 ms
 5  prag-b1-pos4-0.telia.net (213.248.77.117)  0.867 ms  0.800 ms  0.884 ms
 6  hbg-bb1-pos1-3-2.telia.net (213.248.64.181)  26.808 ms  26.885 ms  26.638 ms
 7  kbn-bb1-pos2-0-0.telia.net (213.248.64.29)  32.324 ms  32.372 ms  32.316 ms
 8  nyk-bb1-pos2-0-0.telia.net (213.248.64.110)  111.833 ms  111.701 ms  111.697 ms
 9  chi-bb1-pos0-1-0.telia.net (213.248.80.6)  137.653 ms  137.799 ms  137.962 ms
10  genuity2.k.telia.net (213.248.84.66)  134.193 ms  133.843 ms  133.846 ms
11  so-2-3-0.chcgil2-br1.bbnplanet.net (4.24.7.133)  132.150 ms  132.127 ms  132.033 ms
12  so-7-0-0.chcgil2-br2.bbnplanet.net (4.24.5.218)  132.175 ms  132.197 ms  132.248 ms
13  p4-0.dnvtco1-br2.bbnplanet.net (4.24.9.62)  187.552 ms  187.429 ms  188.031 ms
14  p15-0.snjpca1-br2.bbnplanet.net (4.0.6.225)  181.492 ms  181.259 ms  181.456 ms
15  p1-0.sjccolo-dbe2.bbnplanet.net (4.24.6.249)  187.192 ms  188.640 ms  187.578 ms
16  vlan40.sjccolo-isw03-rc1.bbnplanet.net (128.11.200.91)  187.261 ms  187.584 ms  187.468 ms
17  128.11.16.169 (128.11.16.169)  187.644 ms  187.481 ms  187.460 ms
18  www.sgi.com (128.167.58.40) [open]  181.586 ms  182.415 ms  181.513 ms
vana:/mnt2$
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1. connectivity to bkbits.net?

We've been having problems getting out to certain parts of the net for the
last few days, in particular, we can't get to sgi.com which is unusual.
If you are having problems getting to bkbits.net, let me know.  We have
a couple of machines at rackspace and I can push repos over there.

traceroute to sgi.com (128.167.58.40), 30 hops max, 38 byte packets
 1  bitmover (10.3.9.3)  0.535 ms  0.103 ms  0.100 ms
 2  cisco (192.132.92.1)  1.236 ms  1.175 ms  1.228 ms
 3  s9-1-1-6-0.ar2.SFO1.gblx.net (64.214.96.229)  3.080 ms  3.205 ms  2.982 ms
 4  64.215.195.189 (64.215.195.189)  3.052 ms  3.256 ms  3.114 ms
 5  64.211.147.86 (64.211.147.86)  4.592 ms  4.623 ms  4.468 ms
 6  so6-0-0-2488M.br2.PAO2.gblx.net (207.136.163.126)  4.586 ms  4.530 ms  4.701 ms
 7  p4-0.paix-bi1.bbnplanet.net (4.0.6.81)  4.627 ms  4.467 ms  4.427 ms
 8  p6-0.snjpca1-br1.bbnplanet.net (4.24.7.61)  5.179 ms  5.678 ms  5.215 ms
 9  p1-0.sjccolo-dbe1.bbnplanet.net (4.24.6.253)  5.431 ms  5.214 ms  5.235 ms
10  vlan40.sjccolo-isw03-rc1.bbnplanet.net (128.11.200.91)  5.326 ms  5.396 ms  5.464 ms
11  128.11.16.169 (128.11.16.169)  5.581 ms  5.470 ms  5.654 ms
12  *
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