Technically MPI Spec may not put a requirement on TCP/IP, however Open MPI's runtime environment needs some way to launch jobs and pass data around in a standard way and it currently uses TCP/IP. That being said there have been rumblings for some time to use other protocols but that has not yet come into being.

--td

*Subject:* [OMPI users] Help: Firewall problems
*From:* Lee Amy (/openlinuxsource_at_[hidden]/)
*Date:* 2009-11-05 11:28:50

Hi,

I remembered MPI does not count on TCP/IP but why default iptables
will prevent the MPI programs from running? After I stop iptables then
programs run well. I use Ethernet as connection.

Could anyone tell me tips about fix this problem?

Thank you very much.

Amy

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