I want to take a continuous dump file of particular size and after the dump reached it predefined size the new data should overwrite the file.
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So you want to dump to a file until it gets to say 20MB, and then, start dropping the oldest line from the file each time a new line is written? – slm Dec 16 '13 at 07:15
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yes @slm that's right – Özzesh Dec 16 '13 at 08:29
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I think your options, without the -G switch of tcpdump are limited to the method discussed in this U&L Q&A titled: Keep log file size fixed without logrotate.
The issue you're going to run into is, that with the alternative methods, a kill -HUP ... will need to be sent to tcpdump to signal it that the file's been moved/removed,
I'm not sure tcpdump is up to doing this, so I think your best option is to get a version of tcpdump on the box with this feature, IMO
