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I can't access some websites from a subset of computers on our work network - and it's really random. Examples of sites I can't access:

www.digium.com
www.lenta.ru
www.asterisk.com

Our provider (Verizon) swears that everything is good on their end. We've tried rebooting the router - to no avail. Out of 10 PCs in the office, 4 of them can't access the sites above.

I've tried comparing tracert between a site that I can and cannot access. The only meaningful difference I see is that after leaving the Verizon network, the non-accessible sites go through 130.81.199.38, while accessible ones do not.

Here is the tracert from hitting google.com (accessible)

192.168.102.253
L200.LSANCA-DSL-55.verizon-gni.net [98.112.22.1]
G0-10-0-4.LSANCA-LCR-21.verizon-gni.net [130.81.46.20]
ae4-0.LAX01-BB-RTR1.verizon-gni.net [130.81.199.98]
0.ae3.XL3.LAX15.ALTER.NET [152.63.6.89]
TenGigE0-4-2-0.GW4.LAX15.ALTER.NET [152.63.115.186]
google-gw.customer.alter.net [63.125.112.154]
216.239.46.40
216.239.43.76
lax04s08-in-f19.1e100.net [74.125.224.243]

Here is the tracert from hitting digium.com (non-accessible)

 192.168.102.253
 L200.LSANCA-DSL-55.verizon-gni.net [98.112.22.1]
 G0-6-0-4.LSANCA-LCR-21.verizon-gni.net [130.81.193.252]
 130.81.199.38
 0.xe-4-1-0.BR1.LAX15.ALTER.NET [152.63.112.229]
 204.255.168.94
 144.232.1.177
 144.232.7.165
 144.232.7.125
 144.232.12.40
 144.232.11.16
144.232.1.72
sl-st20-chi-4-0-0.sprintlink.net [144.232.18.153]
144.223.34.138
67.218.175.133
hsv3.gig1-2.apid.com [74.51.99.2]
Request timed out.
...

The problem started occurring sometimes last week. How can I troubleshoot it?
P.S. The problematic machines are a mix of Win7 and XP (as are the non-problematic ones)

share|improve this question
    
I don't know what's causing it however I can tell you that as long as 6 of the PCs can access the website, it's an internal error of the computers, not Verizon. –  Chipperyman Jun 22 '13 at 3:51
    
can you show us ROUTE PRINT output from problematic ones? –  dusan.bajic Jun 22 '13 at 7:12
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