Check out the scenario when Streamyx is down...
Screen capture 1: (Streamyx function normally)
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Teoh Yi Haur>ping yahoo.com
Pinging yahoo.com [216.109.112.135] with 32 bytes of data:
Reply from 216.109.112.135: bytes=32 time=312ms TTL=51
Reply from 216.109.112.135: bytes=32 time=313ms TTL=51
Reply from 216.109.112.135: bytes=32 time=312ms TTL=51
Reply from 216.109.112.135: bytes=32 time=312ms TTL=51
Ping statistics for 216.109.112.135:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 312ms, Maximum = 313ms, Average = 312ms
C:\Documents and Settings\Teoh Yi Haur>tracert 216.109.112.135
Tracing route to w2.rc.vip.dcn.yahoo.com [216.109.112.135]
over a maximum of 30 hops:
1 * * * Request timed out.
2 46 ms 70 ms 29 ms 219.93.218.177
3 18 ms 18 ms 17 ms 219.93.216.101
4 17 ms 18 ms 17 ms 219.93.155.37
5 18 ms 17 ms 18 ms 219.94.12.133
6 119 ms 216 ms 18 ms 210.187.143.1
7 209 ms 26 ms 200 ms 219.93.174.155
8 18 ms 18 ms 18 ms 219.93.151.226
9 245 ms 244 ms 244 ms 219.93.168.234
10 254 ms 254 ms 255 ms exchange-cust1.lax.equinix.net [206.223.123.16]
11 312 ms 312 ms 313 ms ge-2-0-8.p420.pat1.dce.yahoo.com [216.115.97.134]
12 311 ms 312 ms 312 ms ge-0-0-0-p100.msr1.dcn.yahoo.com [216.115.108.1]
13 312 ms 312 ms 313 ms ge7-2.bas2-m.dcn.yahoo.com [216.109.120.197]
14 311 ms 312 ms 312 ms w2.rc.vip.dcn.yahoo.com [216.109.112.135]
Trace complete.
C:\Documents and Settings\Teoh Yi Haur>
Screen capture 2: (Streamyx Exchange down)
Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:\Documents and Settings\brandon>ping yahoo.com
Pinging yahoo.com [216.109.112.135] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 216.109.112.135:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:\Documents and Settings\brandon>ping 216.109.112.135
Pinging 216.109.112.135 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 216.109.112.135:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:\Documents and Settings\brandon>tracert 216.109.112.135
Tracing route to w2.rc.vip.dcn.yahoo.com [216.109.112.135]
over a maximum of 30 hops:
1 * * * Request timed out.
2 74 ms 38 ms 22 ms 219.93.218.177
3 18 ms 18 ms 19 ms 219.93.216.101
4 18 ms 18 ms 17 ms 219.93.155.37
5 17 ms 17 ms 19 ms 219.93.177.243
6 19 ms 18 ms 18 ms 219.93.174.83
7 365 ms 366 ms 362 ms 219.93.168.238
8 * * * Request timed out.
9 * * * Request timed out.
10 * * * Request timed out.
11 * * * Request timed out.
12 * * * Request timed out.
13 * * * Request timed out.
14 * * * Request timed out.
15 * * * Request timed out.
16 * * * Request timed out.
17 * * * Request timed out.
18 * * * Request timed out.
19 * * * Request timed out.
20 * * * Request timed out.
21 * * * Request timed out.
22 * * * Request timed out.
23 * * * Request timed out.
24 * * * Request timed out.
25 * * * Request timed out.
26 * * * Request timed out.
27 * * * Request timed out.
28 * * * Request timed out.
29 * * * Request timed out.
30 * * * Request timed out.
Trace complete.
C:\Documents and Settings\brandon>
Conclusion:
Both scenarios indicate that the DNS (202.188.0.133 or 202.188.1.5) is working fine, however in scenario 2, the exchange is not reachable, thus you are unable to surf anything web sites. In this example, we try to PING Yahoo web site.
Screen capture 1: (Streamyx function normally)
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Teoh Yi Haur>ping yahoo.com
Pinging yahoo.com [216.109.112.135] with 32 bytes of data:
Reply from 216.109.112.135: bytes=32 time=312ms TTL=51
Reply from 216.109.112.135: bytes=32 time=313ms TTL=51
Reply from 216.109.112.135: bytes=32 time=312ms TTL=51
Reply from 216.109.112.135: bytes=32 time=312ms TTL=51
Ping statistics for 216.109.112.135:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 312ms, Maximum = 313ms, Average = 312ms
C:\Documents and Settings\Teoh Yi Haur>tracert 216.109.112.135
Tracing route to w2.rc.vip.dcn.yahoo.com [216.109.112.135]
over a maximum of 30 hops:
1 * * * Request timed out.
2 46 ms 70 ms 29 ms 219.93.218.177
3 18 ms 18 ms 17 ms 219.93.216.101
4 17 ms 18 ms 17 ms 219.93.155.37
5 18 ms 17 ms 18 ms 219.94.12.133
6 119 ms 216 ms 18 ms 210.187.143.1
7 209 ms 26 ms 200 ms 219.93.174.155
8 18 ms 18 ms 18 ms 219.93.151.226
9 245 ms 244 ms 244 ms 219.93.168.234
10 254 ms 254 ms 255 ms exchange-cust1.lax.equinix.net [206.223.123.16]
11 312 ms 312 ms 313 ms ge-2-0-8.p420.pat1.dce.yahoo.com [216.115.97.134]
12 311 ms 312 ms 312 ms ge-0-0-0-p100.msr1.dcn.yahoo.com [216.115.108.1]
13 312 ms 312 ms 313 ms ge7-2.bas2-m.dcn.yahoo.com [216.109.120.197]
14 311 ms 312 ms 312 ms w2.rc.vip.dcn.yahoo.com [216.109.112.135]
Trace complete.
C:\Documents and Settings\Teoh Yi Haur>
Screen capture 2: (Streamyx Exchange down)
Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:\Documents and Settings\brandon>ping yahoo.com
Pinging yahoo.com [216.109.112.135] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 216.109.112.135:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:\Documents and Settings\brandon>ping 216.109.112.135
Pinging 216.109.112.135 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 216.109.112.135:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:\Documents and Settings\brandon>tracert 216.109.112.135
Tracing route to w2.rc.vip.dcn.yahoo.com [216.109.112.135]
over a maximum of 30 hops:
1 * * * Request timed out.
2 74 ms 38 ms 22 ms 219.93.218.177
3 18 ms 18 ms 19 ms 219.93.216.101
4 18 ms 18 ms 17 ms 219.93.155.37
5 17 ms 17 ms 19 ms 219.93.177.243
6 19 ms 18 ms 18 ms 219.93.174.83
7 365 ms 366 ms 362 ms 219.93.168.238
8 * * * Request timed out.
9 * * * Request timed out.
10 * * * Request timed out.
11 * * * Request timed out.
12 * * * Request timed out.
13 * * * Request timed out.
14 * * * Request timed out.
15 * * * Request timed out.
16 * * * Request timed out.
17 * * * Request timed out.
18 * * * Request timed out.
19 * * * Request timed out.
20 * * * Request timed out.
21 * * * Request timed out.
22 * * * Request timed out.
23 * * * Request timed out.
24 * * * Request timed out.
25 * * * Request timed out.
26 * * * Request timed out.
27 * * * Request timed out.
28 * * * Request timed out.
29 * * * Request timed out.
30 * * * Request timed out.
Trace complete.
C:\Documents and Settings\brandon>
Conclusion:
Both scenarios indicate that the DNS (202.188.0.133 or 202.188.1.5) is working fine, however in scenario 2, the exchange is not reachable, thus you are unable to surf anything web sites. In this example, we try to PING Yahoo web site.
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