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Question

imaging behind NAT

  • July 3, 2008
  • 2 replies
  • 13 views
T
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So

For our summer imaging project I am running into a few snags. We have pulled a server out of our server room that was extra and are making a mobile imaging cart to take out to all of our laptops. Well, since every building is on different VLANs we thought it would be a good idea to toss the server behind a router and then not have to deal with all the managed switches and VLANs. Our infrastructure is not fully in place and eventually (since we are education and work off a budget) will have extra servers in each building for netbooting. However, since that is not the case we are going with mobile carts for this year.

I can netboot just fine and it will autorun the data just fine behind a router. The snags I am running into is that I first noticed it will not resolve the JSS by domain name, only by IP address. Not a huge deal, but I am not sure why that is. Second it seems to want to not use the default server I set in the JSS, it wants to use the master file server. I did a mass edit of auto run data and pointed it all to the mobile image server which has a 192.168.x.x address. The router is controlling all DHCP so all clients will have a class C address. The router also gives the server the same IP every time, it is reserved for that server.

Then the casper client will run but error out half way through. I can only assume this is because I am behind NAT? I have never tried this before. I have AFP forwarded from the router to the server and anything that comes over port 548 will hit that server instead.

Anyone ever try this? I know this is most likely one small thing I am over looking on my end, but I think technically this should work no issues. Of course after my 6 new xserves come in sometime this fall I won't ever have this issue again, because I will have servers in the buildings that can do this.

Thanks

Thomas Larkin
TIS Department
KCKPS USD500
tlarki at kckps.org
cell: 913-449-7589
office: 913-627-0351

    2 replies

    A
    • Anonymous
    • July 3, 2008

    OK we have done the exact same thing. I won't go into a rant regarding
    this, simply put it was and is horrible.
    1) DNS resolution: if you are nating behind a segment that has its own
    external DNS then it will never see your Casper server by name. The fix is
    to manually add a DNS entry to your IP config and it will see the server.
    You should be able to do this @ the fire wall (assuming you are using a DHCP
    server in the firewall). If not add the entry to your DHCP server for the
    DNS server in the nated segment.
    2) Ports that need to be opened: 8443 & 9006 . You'll need to forward all
    traffic from the nated segment on 8443 and 9006 to the JSS server.
    3) 548 is only needed if you will be updating the Casper share that resides
    behind the Nat or if you are pulling packages from the Master. In either
    case a many to one 548 mapping will work.

    T
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    • tlarkin
    • Author
    • Honored Contributor
    • July 3, 2008

    I got it working and the client netboots to the netboot server on the LAN and goes across the WAN to the JSS for auto run data, but the minute it starts the block copy of the OS image to the client after about 30seconds to a minute it errors out with an NbiObjectException error message

    any ideas?

    Thomas Larkin
    TIS Department
    KCKPS USD500
    tlarki at kckps.org
    cell: 913-449-7589
    office: 913-627-0351

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