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 220.127.116.11, 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 [18.104.22.168] G0-10-0-4.LSANCA-LCR-21.verizon-gni.net [22.214.171.124] ae4-0.LAX01-BB-RTR1.verizon-gni.net [126.96.36.199] 0.ae3.XL3.LAX15.ALTER.NET [188.8.131.52] TenGigE0-4-2-0.GW4.LAX15.ALTER.NET [184.108.40.206] google-gw.customer.alter.net [220.127.116.11] 18.104.22.168 22.214.171.124 lax04s08-in-f19.1e100.net [126.96.36.199]
Here is the
tracert from hitting digium.com (non-accessible)
192.168.102.253 L200.LSANCA-DSL-55.verizon-gni.net [188.8.131.52] G0-6-0-4.LSANCA-LCR-21.verizon-gni.net [184.108.40.206] 220.127.116.11 0.xe-4-1-0.BR1.LAX15.ALTER.NET [18.104.22.168] 22.214.171.124 126.96.36.199 188.8.131.52 184.108.40.206 220.127.116.11 18.104.22.168 22.214.171.124 sl-st20-chi-4-0-0.sprintlink.net [126.96.36.199] 188.8.131.52 184.108.40.206 hsv3.gig1-2.apid.com [220.127.116.11] 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)