Why click can't receive packet unless I start TCPDUMP?????

shule ney <[email protected]>
Newsgroups gmane.network.routing.click
Message-ID <CAF8yJrOx7W42uPciJegz5Y=uQyi_Y9zeDmuwv7K0xDkQs9eCLQ@mail.gmail.com>
Hi all:
I faced a weird problem that click can't get packet unless I start TCPDUMP,
what should be the problem?? I use another sender while it works fine, what
should be the problem? The sender or the receiver??
Thanks very much for your help.

Best Regards
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