[afnog] Problem accessing some sites

[Scott Weeks]

--- otienomike at gmail.com wrote:
From: mike otieno <otienomike at gmail.com>

: On path A; All the prefixes are working perfectly and 
: accessing all internet sites.

: On path B; The prefixes can open some sites and not others 
: like; yahoo.com, .uk. fr and http://www.tvchannelsfree.com/.
-----------------------------------------------


Could your upstream provider "B" be blocking some sites?

scott







--- otienomike at gmail.com wrote:

From: mike otieno <otienomike at gmail.com>
To: afnog at afnog.org
Subject: [afnog] Problem accessing some sites
Date: Thu, 11 Aug 2011 09:56:13 +0300

Hi

I need some help with a problem am experiencing in my network.
I have a client that am giving transit, and he has two fiber paths to our
core routers.
Path A connects to router A on my network.
Path B connects to a different router B on my network.

On path A; All the prefixes are working perfectly and accessing all internet
sites.

On path B; The prefixes can open some sites and not others like; yahoo.com,
.uk. fr and http://www.tvchannelsfree.com/. Now i have a more specific block
/24 advertised on this path and its uplink is preferring this path as the
best, same with the down-link. As i get this from all looking glasses. To
eliminate double advertisement we even shut down BGP via path A.
A trace from this client to yahoo with the source ip advertised via this
path B, gets lost on the 14th hop and beyond. See below trace;

Tracing the route to yahoo.com (72.30.2.43)

  1 41.215.251.42 0 msec 0 msec 4 msec
  2 41.84.146.13 [AS 33770] 212 msec 208 msec 212 msec
  3  *  *  *
  4 ae-34-52.ebr2.London1.Level3.net (4.69.139.97) [AS 33770] 208 msec 208
msec 208 msec
  5 ae-41-41.ebr1.NewYork1.Level3.net (4.69.137.66) [AS 33770] 280 msec
    ae-42-42.ebr1.NewYork1.Level3.net (4.69.137.70) [AS 33770] 276 msec
    ae-44-44.ebr1.NewYork1.Level3.net (4.69.137.78) [AS 33770] 280 msec
  6 ae-91-91.csw4.NewYork1.Level3.net (4.69.134.78) [AS 33770] 284 msec
    ae-61-61.csw1.NewYork1.Level3.net (4.69.134.66) [AS 33770] 288 msec 280
msec
  7 ae-72-72.ebr2.NewYork1.Level3.net (4.69.148.37) [AS 33770] 276 msec
    ae-92-92.ebr2.NewYork1.Level3.net (4.69.148.45) [AS 33770] 280 msec
    ae-72-72.ebr2.NewYork1.Level3.net (4.69.148.37) [AS 33770] 276 msec
  8 ae-2-2.ebr4.SanJose1.Level3.net (4.69.135.185) [AS 33770] 348 msec 344
msec 344 msec
  9 ae-61-61.csw1.SanJose1.Level3.net (4.69.153.2) [AS 33770] 352 msec
    ae-91-91.csw4.SanJose1.Level3.net (4.69.153.14) [AS 33770] 348 msec
    ae-71-71.csw2.SanJose1.Level3.net (4.69.153.6) [AS 33770] 344 msec
 10 ae-43-90.car3.SanJose1.Level3.net (4.69.152.197) [AS 33770] 344 msec 348
msec
    ae-23-70.car3.SanJose1.Level3.net (4.69.152.69) [AS 33770] 344 msec
 11 YAHOO-INC.car3.SanJose1.Level3.net (4.71.112.14) [AS 33770] 348 msec 344
msec 348 msec
 12 ae-0-d221.msr1.sk1.yahoo.com (216.115.106.139) [AS 33770] 348 msec
    ae-0-d231.msr2.sk1.yahoo.com (216.115.106.143) [AS 33770] 384 msec
    ae-0-d221.msr1.sk1.yahoo.com (216.115.106.139) [AS 33770] 344 msec
 13 te-9-1.bas-k1.sk1.yahoo.com (68.180.160.13) [AS 33770] 348 msec
    te-8-1.bas-k2.sk1.yahoo.com (68.180.160.11) [AS 33770] 348 msec
    te-9-1.bas-k1.sk1.yahoo.com (68.180.160.13) [AS 33770] 348 msec
 14  *  *  *
 15  *  *  *
 16  *  *  *
 17  *  *  *
 18  *  *  *
 19  *

Please help out with ideas as to why i am experiencing this.
-- 
Rgds
Michael Otieno


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