[MPICH] Re: Using MPICH2 on different ports

[Matt Valerio]

Hi everyone,

Thanks for your responses.  I think they've answered my question, and the
answer is that what I want to do is not possible.

Yes, Matthew Chambers has it right.

My current grid setup involves a number of computers (192.168.0.*), each
running smpd on port 8676.  I have one of those computers as the "gateway",
that has 2 network cards, with one connected to the public network and one
connected to the private network.  I want to give any computer in the public
network access to the computers on the private network by opening up a range
of ports on the gateway computer.  This approach is exactly how I open up
Remote Desktop (RDP) currently.

So for example, I want to set up the forwarding as:
gateway:10101 --> slave01:8676
gateway:10102 --> slave02:8676
gateway:10103 --> slave03:8676
etc.

As you've said, this approach is currently not possible -- the machine file
doesn't allow it.  For various reasons, I cannot put all of the computers on
the private network onto the public network -- using NAT is my only option.

Sorry for the confusion of firewall vs. NAT.  The port forwarding rules are
firewall exceptions in the control panel, so I get confused.

So.....does anyone know if there are plans to implement this kind of
fine-grained control over the network connections?  I think it would greatly
enhance the ways that MPICH2 clusters can be deployed.

Thanks for your help,
-Matt


On 4/20/07, Matthew Chambers <matthew.chambers at vanderbilt.edu> wrote:
>
>  I don't understand how that could solve his problem.  I think Matt
> Valerio's initial description of the problem was misleading, though.  It
> seems to me that he is not trying to connect through a simple firewall, he
> is trying to connect through a NAT.  It seems he wants to use port
> forwarding set up on the NAT in way that will enable him, from a computer
> outside the NAT, to create a machine config file that connects to the same
> host IP (e.g. the WAN IP of the NAT) with different ports, which will
> logically connect to multiple machines inside of the NAT.  However, as you
> say, that is not possible with the current SMPD machine config file.  I do
> think that is bad design on the part of the config file though.  Would it be
> very difficult to extend the config file to support specification of port as
> well as host/IP?
>
>
>   ------------------------------
>
> *From:* owner-mpich-discuss at mcs.anl.gov [mailto:owner-
> mpich-discuss at mcs.anl.gov] *On Behalf Of *Jayesh Krishna
> *Sent:* Friday, April 20, 2007 10:56 AM
> *To:* 'Matt Valerio'
> *Cc:* mpich-discuss at mcs.anl.gov
> *Subject:* RE: [MPICH] Re: Using MPICH2 on different ports
>
>
>
> Hi,
>
>  SMPD, by default, runs on the same port (8676) on all computers. However
> you can specify the port that smpd needs to run using the "-port" option
> while starting smpd (You can also ask smpd to run on any port assigned by OS
> using the "-anyport" option). The machine config file does not support
> specifying port names along with the machine name & number of procs.
>
>  Instead of mapping the port numbers to IP+port you could allow
> connections from a certain list of client machines/IPs to certain port (say
> 8000) numbers on computer1/2/..
>
>  Let us know if you require any further information.
>
>
>
> Regards,
>
> Jayesh
>
>
>  ------------------------------
>
> *From:* owner-mpich-discuss at mcs.anl.gov [mailto:owner-
> mpich-discuss at mcs.anl.gov] *On Behalf Of *Matt Valerio
> *Sent:* Wednesday, April 18, 2007 11:04 AM
> *To:* mpich-discuss at mcs.anl.gov
> *Subject:* [MPICH] Re: Using MPICH2 on different ports
>
> Ok, let me try to simplify the question.
>
> Does smpd need to run on the same port on all computers?
> Can I tell mpiexec that it needs to connect to all of the smpd computers
> on different ports?
>
> I know that the machine config file can specify different computers, but
> the same port.  I am just curious if the machine config file can specify
> different computers as well as different ports.
>
> Any help would be greatly apppreciated.  Thanks!
> -Matt
>
>
>  On 4/16/07, *Matt Valerio* <matt.valerio at gmail.com > wrote:
>
> Hello MPICH2 users,
>
> I am wondering if there is a way to instruct mpiexec to use multiple
> computers running smpd on different ports.
>
> For example, I have 10 computers behind a firewall.  Each of those 10
> computers is running smpd on the same port (let's say 8000).
> I want to put rules into a firewall computer that maps an
> externally-available port to the specific computer
>
> firewall:8001 ----(maps to)----------> computer1:8000
> firewall:8002 ----(maps to)----------> computer2:8000
> ...
> firewall:8010 ----(maps to)----------> computer10:8000
>
> Then in the machine configuration file, I need to be able to tell mpiexec
> that it can use the same computer but different ports (8000-8010), like
>
> firewall:8001
> firewall:8002
> ...
> firewall:8010
>
> etc.
>
> Is this currently possible?  I know the machine file format is wrong
> because the number after the colon specifies the number of processes, not
> the port number.
>
> Does anyone have any ideas as to whether this kind of thing could work?
> Is there a better way?  Any help would be greatly appreciated.
>
> Thanks!
> -Matt
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/mpich-discuss/attachments/20070420/cee7db8c/attachment.htm>