Before I posted I was already thinking about installing (t)ethereal to do that. The reason why I prefer tcpdump is the fact that it's default on 90% of GNU/Linux and Unix systems.
Now consistency worries me. I didn't know that there could be so much variation in the data output format between versions of tcpdump, and specially, that I wouldn't be able to format this output by supplying different parameters. tethereal will end up as my definite solution.
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