On Fri, Jul 23, 2010 at 8:55 PM, Patrick Nolan
<patrick.no...@stanford.edu> wrote:
>
> I am worried because dhclient (after the kernel boots) is listening to
> the infiniband and loopback devices.  This just seems wrong.  Is there
> anything I can do about it?
>

As I recall, you can choose to not use dhcp on the clients. I don't.

>  From the beginning iptables was set to accept anything from the private
> network where the clients live, and also for the whole range of IP
> addresses on that net.  Here's part of the output of iptables -L -v:
>
>  pkts bytes target prot opt  in    out     source     destination
>     0     0 ACCEPT  all  --  eth1  eth1    anywhere   anywhere
> 75581 2526K ACCEPT  udp  --  any   any  192.168.0.0/24 anywhere udp
>  1238  162K ACCEPT  tcp  --  any   any  192.168.0.0/24 anywhere tcp
>

I recommend just disabling it completely on the head node during the
configuration and node installation.

On the compute nodes, you definitely don't want to run it; It will
just add latency to all of your IP communication.

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