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HW:
Lenovo T520 laptop with MS WIN 7
OR
dedicated PC (DELL GX 280)
SW:
CentOS 6.5 (64-bit) installed on VMware Player on MS WIN 7 host
CASE A) -- BRIDGED networking selected
CASE B) -- NAT networking
OR
CentOS 6.5 i(32-bit) nstalled on real HW (DELL OptiPlex GX 280)
___issue____ at hand:
The default Firefox ESR browser (17.0.10) does not find many web pages.
regardless of the system (virtual - bridged or NAT OR real HW)
Server not found
Firefox can't find the server at www.opera.com.
:::important:::
All the examples from above work flawlessly on the MS WIN 7 on the
same laptop, the same ETHERNET cable connected to the same switch hub
with the same router at the same time.
[Reminder: CentOS 6.5 runs on VMWare on WIN 7]
Any hint, FAQ, pointer to RTFM is more than welcome
[igor@localhost ~]$ traceroute www.google.com
traceroute to www.google.com (74.125.196.106), 30 hops max, 60 byte packets
1 192.168.1.254 (192.168.1.254) 0.290 ms 0.311 ms 0.387 ms
2 adsl-98-70-114-1.tys.bellsouth.net (98.70.114.1) 7.702 ms 10.346 ms 12.766 ms
3 70.159.238.70 (70.159.238.70) 26.058 ms 28.418 ms 30.813 ms
4 70.159.238.69 (70.159.238.69) 31.993 ms 34.428 ms 37.330 ms
5 70.159.238.73 (70.159.238.73) 40.007 ms 42.435 ms 44.889 ms
6 70.159.238.85 (70.159.238.85) 46.044 ms 16.465 ms 18.511 ms
7 12.81.60.58 (12.81.60.58) 19.950 ms 14.904 ms 17.235 ms
8 12.81.60.70 (12.81.60.70) 22.624 ms 23.585 ms 27.477 ms
<snip> <snip> <snip>
20 209.85.243.254 (209.85.243.254) 44.328 ms 23.293 ms 209.85.248.31(209.85.248.31) 23.022 ms
21 * * *
22 yk-in-f106.1e100.net (74.125.196.106) 32.666 ms 34.817 ms 37.496 ms
Mystery resolved. The CAT5 cable from router to the switch hub was flaky. After I've replaced it with another one all the illogical puzzling behavior went away. What I do not understand is why, for example, some sites like, www.google.com and www.gmail.com worked flawlessly all the time. At same time some sites (like www.delo.si) worked and some others did not (like www.dnevnik.si).
google and the google gmail have SO MANY!!! dns entries that it is nearly imposible to not find them
so for lesser known sites the host might not have been resolvable from the cache
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