RHEL5 Install via Ubuntu NFS

After booting a RHEL4 or 5 disk with "linux askmethod" and getting the system online (the Celerra could ping it) and making sure the appropriate IP was in the ACL, I still couldn't mount the ISO images to install:

RPC timeout that directory could not be mounted from the server

I ended up mounting the Celerra from an already installed system on the same network, copying the ISOs over to it and then umounting the Celerra. I then made that system an NFS server and now the five RHEL5 hosts have no problem mounting it for an NFS based install.

When setting up an NFS server make sure that portmap is running so that it listens on port 111 for the RPC calls that NFS needs.

# netstat -npl | egrep "111|2049"
tcp        0      0 0.0.0.0:2049            0.0.0.0:*               LISTEN     -                   
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN     29969/portmap       
udp        0      0 0.0.0.0:2049            0.0.0.0:*                          -                   
udp        0      0 0.0.0.0:111             0.0.0.0:*                          29969/portmap       

It's annoying that I'm not sure why the Celerra won't serve this purpose and that I don't have any log data to figure out why. If time allows I'll try again with tcpdump but I need to get these hosts installed.

Update

The firewall admin noticed that the host that was booted from the RHEL5 CD was trying to make a UDP connection to port 1234 of the Celerra. Opening this seems to have fixed the problem.