[K12OSN] Network specialist foes: rice bet

Les Mikesell les at futuresource.com
Wed Oct 26 12:41:45 UTC 2005


On Wed, 2005-10-26 at 07:16, Alan A Hodson wrote:
> Hi folks
> 
> I am willing to bet half the rice in China that if you are not a 
> network specialist in your district, at one time or another you have 
> been approached by a network specialist about your K12LTSP server 
> setup. In my own case, I've received an "ultimatum" not to install 
> servers with network services running, that "affect the whole network"
> 
> The obvious are DNS, sendmail and named - I almost always remember to 
> "chkconfig --level 2345 (service) off" to keep them off my back, but 
> their latest level of aggressiveness concerns me - WHAT other 
> services should I be considering as possible "not network necessary" 
> so I can anticipate their requests?
> 
> A list of these "Avoid Network Questions" services might be helpful 
> to the group.

The only thing that will break the rest of the network is if you
have a DHCP server running on the interface that connects to
the main network.  This can happen accidentally when you first
set a 2-nic server up since you won't know which will be eth0
and which is eth1, and on major upgrades that change the kernel
(like between 2.4 and 2.6) the order can change.   The stock setup
only activates DHCP on one NIC, so I think the recommended procedure
is to disconnect the main network until you have successfully booted
a client - which proves DCHP is running in the right place.

Other than that, it is more a matter of policy and you should be
aware of existing DNS servers, proxies, smtp relays, etc. and the
policies regarding their use.   In some cases you may just need
a special configuration instead of removing the service.

You probably shouldn't attempt a single NIC setup with everything
on the main network without close coordination with the network
administrator.

-- 
  Les Mikesell
    les at futuresource.com





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