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Thanks for your kind answers.

Most of all, yes, my network node and compute nodes have no gre rules on iptables. But, when following your descriptions, there was no "control_exchange=neutron" in neutron.conf of my configuration.
and now I can connect VM floating-IP directly from external node ! Thanks!

I still cannot find any gre-related rules on network and compute node :|

Following link shows the successful gre tcpdump and ssh connection using floating-ip