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9. Case Studies > Kinked Cable

Kinked Cable

Monitoring of a web site from the same LAN reveals that static pages are either served instantly, or after a fixed delay. The monitoring graph in Figure 9-4 has horizontal striations as a result.

Some pages delivered with a fixed delay

Figure 9-4. Some pages delivered with a fixed delay

Since the web server is on a Solaris machine, we use the snoop command to see what is going on at a packet level while hitting the web server. We use the -t d option to print time differentials between packets. The open source tcpdump command would also work here.

# snoop -t d server port 80

Here is a shell script that grabs a page with the Perl LWP library’s GET command and simply redirects standard output to /dev/null, instead of printing out the time it took to get the page. Note that


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