OSCAR doesn't need a gateway on the head node to work. One way
communication generally implies there is a firewall on the head node or
other routing problem.
What do you get from "iptables -L" on the head node?
You might try using a different address for the head node than 192.168.0.1,
that is a common default address for networking hardware and can cause
problems like this occasionally. I have become fond of 10.0.0.x because it
isn't used as much.
You could also change the switch address too, if that is the problem.
On 10/26/07, Robert Ashcraft <[EMAIL PROTECTED]> wrote:
>
> Michael,
>
> Thanks for the response. My colleague has tried those things and they did
> not seems to help. The "ssh -vvv" command does not provide any output and
> presumably just hangs somewhere in the connection process.
>
> Just as some information... If we set up the the compute node to connect
> to DCHP over the external MIT network (not through the switch), I was able
> to get two way communication (through the MIT network). This seems to imply
> that it is some wrong with the static IP setup or something related to the
> switch. However, the one-way communication is puzzling. I don't think we
> have a gateway specified for the head node internal IP address, only the IP
> (192.168.0.1) and subnet mask (255.255.255.0). Could that be the source
> of any problems?
>
> We will continue to try to diagnose the problem, but any more insight
> would be welcomed. Thanks,
>
> Rob
>
>
> Michael Edwards wrote:
>
> Do you have the firewall on the head node turned off?
>
> You can check by doing "iptables -L" or checking under the "security
> level" utility.
>
> You can also try doing "ssh -vvv [EMAIL PROTECTED] " and see if it gives you
> any clues.
>
> On 10/25/07, Robert Wilson Ashcraft <[EMAIL PROTECTED]> wrote:
> >
> > Hi,
> >
> > I am attempting to set up an OSCAR cluster. I have gotten through
> > everything
> > past step 7, Complete CLuster Setup (which finished successfully).
> >
> > However, when I run the cluster tests, I get several failures, most
> > noticibly
> > with the node--> server communication.
> >
> > This is also confirmed by the fact that I can SSH to a node, but when I
> > am
> > logged into the node, I cannot SSH back into the server (it just
> > hangs... no
> > error message, but I can ctrl-C out of it)
> >
> > Do you have any idea why the SSH from the client to server would not be
> > working?
> >
> > I have a feeling that if this problem is solved, the other failed test
> > will work
> > themselves out.
> >
> > I am attaching the oscarinstall.log file in case that helps.
> >
> > Here is my /etc/hosts file if that helps:
> > # Do not remove the following line, or various programs
> > # that require network functionality will fail.
> > 127.0.0.1 localhost.localdomain localhost
> > 192.168.0.1 pharos.mit.edu pharos oscar_server nfs_oscar pbs_oscar
> > 18.80.7.242 pharos.mit.edu pharos
> >
> > # These entries are managed by SIS, please don't modify them.
> > 192.168.0.100 oscarnode01.mit.edu oscarnode01
> >
> >
> > Thanks for your help.
> >
> > Rob Ashcraft
> >
> >
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