Frank,
Thank you, regarding DNS, I already checked and
everything is fine with ping, trace, and even the 1st
handshke of TCP for the HTTP connection.
The problem is when I receive the 6th packet.
Everytime it arrives with a 75s delta time with CWIDC,
and 2ms delta time with PSInet. However, we
troubleshooted the CWIDC newtork, and found no issues.
Any other ideas ?
Thank you,
Terkud
-----Original Message-----
From: Frank Wells [SMTP:[EMAIL PROTECTED]]
Sent: Friday, December 01, 2000 1:42 AM
To: [EMAIL PROTECTED]
Subject: Re: unexplain latency on the network
My immediate thoughts are DNS resolution. Take a good
look at how your
setup is configured. Get the ip addresses of some
random FQDN's and ping
them by both IP address and FQDN. If there is a
significant disparity in
results between both methods, you probably have name
resolution issues.
>From: Cisco Wave <[EMAIL PROTECTED]>
>Reply-To: Cisco Wave <[EMAIL PROTECTED]>
>To: Cisco Group Study <[EMAIL PROTECTED]>
>Subject: unexplain latency on the network
>Date: Wed, 29 Nov 2000 23:05:49 -0800 (PST)
>
>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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