Thanks, that fixed the problem!!! Somehow I had messed up the iptables 
configuration file.

Michael

Michael Edwards schrieb:
> You need to set up ip masq on he head node so that it knows how to 
> route outside signals to the compute nodes.
>
> OSCAR does not do this.
>
> Here is a howto on the subject: 
> http://www.linux.org/docs/ldp/howto/IP-Masquerade-HOWTO/index.html
>
> On Fri, Jun 27, 2008 at 7:00 AM, Michael Oevermann 
> <[EMAIL PROTECTED] 
> <mailto:[EMAIL PROTECTED]>> wrote:
>
>     Hi,
>
>     we have a problem with login to the nodes via ssh. We have some
>     "normal"
>     users on the head node with
>     their home directories under
>     /home/<username>,
>     but most users have their home directories mounted from a different
>     machine - lets call it nfshome with IP 130.xxx.xxx.xxx - to
>     /Users/<username>
>     on the headnode.
>
>     Both, the head node and the nodes itself have the following line in
>     their /etc/fstab
>
>     130.xxx.xxx.xxx:/Volumes/XRaid00/users  /Users    nfs
>     defaults         0 0
>
>     The nodes also have the line
>
>     nfs_oscar:/home /home   nfs     rw      0       0
>
>
>     The nodes are able to automount the user home directories sitting
>     directly on the
>     head node (/home/<username>) and those users can access the nodes via
>     ssh without
>     passwd.
>
>     However, the nodes fail to mount the nfs mounted home directories
>     130.xxx.xxx.xxx:/Volumes/XRaid00/users. The error in boot.log is,
>     e.g.,
>
>     Jun 26 18:32:23 n01 mount: mount: mount to NFS server '130.xxx.xx.xx'
>     failed: System Error: Connection timed out
>
>     I wonder how this can work at all. The head node and the nfshome
>     machine
>     both have public IP's 130.xxx.xxx.xxx
>     so it is no problem for the head node to mount the user home
>     directories
>     from nfshome.
>     However, the nodes are not connected to the public net, they sit - as
>     usual - in a subnet 192.168.100.xxx
>     connected to the headnode.
>      From the nodes itself it is even impossible to ping the nfshome
>     machine
>     which means that a
>
>     mount -t nfs 130.xxx.xxx.xxx:/Volumes/XRaid00/users  /Users
>
>     on the nodes is not possible.
>
>     Question: What is the correct setup (on head node and/or nodes)
>     that the
>     nodes
>
>     a) mount the user home directories
>     30.xxx.xxx.xxx:/Volumes/XRaid00/users
>     under /Users
>     b) users can access the nodes via ssh (I assume if a) is fixed b) is
>     fixed as well)
>
>
>
>     Thanks for any help!
>
>     MIchael
>
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