Dear All,
I have an unexplicable latency with http when I use
one carrier, and not the other one.
Hours and hours of tests did show that the latency is
NOT coming from the carrier ! Really bizarre, this is
why I am asking you guys ... Please help ...
Here are some tests. Basically the problem is still
happening when we cross CWIDC network.
Traces and pings are working fine, however, when we
use HTPPS over CWIDC, some packets arrive after
1minute.
For example, please look at packet number 6, the delta
time is 75 seconds for CWIDC, and only 2ms for PSINet.
I checked all the packets data and sequences, they are
all the same in both case, only packet 6 is arriving
really late.
PSINet
Frame Source Address Dest. Address Layer Size
Rel. Time Delta Time Summary
1 This station 0002FD79E340 TCP 62
000:00:44.045 0.000.000 1105->World Wide Web
HTTP,[Syn],S=158936,A=0,W=8192
2 0002FD79E340 This station TCP 64
000:00:44.307 0.262.335 World Wide Web
HTTP->1105,[Syn],S=4079829257,A=158937,W=8760
3 This station 0002FD79E340 TCP 58
000:00:44.308 0.000.823 1105->World Wide Web
HTTP,S=158937,A=4079829258,W=8760
4 This station 0002FD79E340 HTTP 397
000:00:44.325 0.017.241 (END of
header),Connection: Keep-Alive
5 0002FD79E340 This station TCP 64
000:00:44.609 0.284.113 World Wide Web
HTTP->1105,S=4079829258,A=159276,W=8760
6 0002FD79E340 This station HTTP 374
000:00:44.611 0.002.338 (END of
header),Content-Length159Data (total
159bytes),(Moredata)
7 This station 0002FD79E340 TCP 62
000:00:44.635 0.024.005 1106->Secure
HTTP,[Syn],S=158942,A=0,W=8192
8 This station 0002FD79E340 TCP 58
000:00:44.796 0.160.191 1105->World Wide Web
HTTP,S=159276,A=4079829574,W=8444
9 0002FD79E340 This station TCP 64
000:00:44.893 0.097.284 Secure
HTTP->1106,[Syn],S=4080039157,A=158943,W=8760
10 This station 0002FD79E340 TCP 58
000:00:44.894 0.000.802 1106->Secure
HTTP,S=158943,A=4080039158,W=8760
11 This station 0002FD79E340 TCP 100
000:00:46.096 1.202.674 1106->Secure
HTTP,S=158943,A=4080039158,W=8760
12 0002FD79E340 This station TCP 64
000:00:46.358 0.261.560 Secure
HTTP->1106,S=4080039158,A=158985,W=8760
CWIDC
Frame Source Address Dest. Address Layer Size
Rel. Time Delta Time Abs. Summary
1 This station 00036BA4EE00 TCP 62
000:00:16.320 0.000.000 1127->World Wide Web
HTTP,[Syn],S=159074,A=0,W=8192
2 00036BA4EE00 This station TCP 64
000:00:16.587 0.267.255 World Wide Web
HTTP->1127,[Syn],S=317519802,A=159075,W=8760
3 This station 00036BA4EE00 TCP 58
000:00:16.588 0.000.743 1127->World Wide Web
HTTP,S=159075,A=317519803,W=8760
4 This station 00036BA4EE00 HTTP 397
000:00:16.606 0.018.040 (END of header),Connection:
Keep-Alive
5 00036BA4EE00 This station TCP 64
000:00:16.881 0.275.304 World Wide Web
HTTP->1127,S=317519803,A=159414,W=8760
6 00036BA4EE00 This station HTTP 374
000:01:31.892 75.010.248 (END of
header),Content-Length: 159Data (total 159
bytes),(Moredata)
7 This station 00036BA4EE00 TCP 62
000:01:31.936 0.044.665 1128->Secure
HTTP,[Syn],S=159085,A=0,W=8192
8 This station 00036BA4EE00 TCP 58
000:01:31.995 0.058.493 1127->World Wide Web
HTTP,S=159414,A=317520119,W=8444
9 00036BA4EE00 This station TCP 64
000:01:32.201 0.206.430 Secure
HTTP->1128,[Syn],S=327401200,A=159086,W=8760
10 This station 00036BA4EE00 TCP 58
000:01:32.202 0.000.716 1128->Secure
HTTP,S=159086,A=327401201,W=8760
11 This station 00036BA4EE00 TCP 100
000:01:32.846 0.643.756 1128->Secure
HTTP,S=159086,A=327401201,W=8760
12 00036BA4EE00 This station TCP 64
000:01:33.106 0.260.536 Secure
HTTP->1128,S=327401201,A=159128,W=8760
Do you have any idea what can be the cause of this ?
We only have the problem with CWIDC, and not with
PSInet.
Could it be server processing depending on IP address
?
Any iodeas will be much appreciated ...
Thank you,
Terkud,
=====
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