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RE: [Condor-users] Using multiple NICs on a machine that gets an IPfrom a DHCP server



Ian,
Since you appear to be working on a Windows network, you may be able to get
your network admin's to assign the current IP address to his NIC hardware
address, so that the DHCP server will always give that address to that
machine and no others.
 
Cheers,
 
Phil
__________________________________________________

-----Original Message-----
From: condor-users-bounces@xxxxxxxxxxx
[mailto:condor-users-bounces@xxxxxxxxxxx] On Behalf Of Ian Chesal
Sent: Tuesday, 18 January 2005 10:55 AM
To: Condor-Users Mail List
Subject: [Condor-users] Using multiple NICs on a machine that gets an IPfrom
a DHCP server



One of our users was unable to get a connection to our CONDOR_HOST
today. After some hair pulling and head banging I clued into the fact
that he had two NICs in his machine. One faced a private network that
was all his own, the other faced our office LAN. Condor was insisting on
using the private NIC as the interface to contact our CONDOR_HOST, which
is actually on our office LAN.

The manual states that you should choose your NIC of choice using the
NETWORK_INTERFACE = <IP of NIC I want condor to use>. Which seems great.
But my user is using DHCP to get his IP address on the office-facing
NIC. I've entered his current IP and his machine is now connecting. But
what is the recommended course of action for DHCP-assigned addresses? He
could lose that IP address any time now.

The other question I have is: why did I even have to do this? Looking in
the MasterLog for his machine the process was able to turn the
"CONDOR_HOST = mymaster.myoffice.com" string into the correct IP address
for the machine. Why couldn't it figure out which NIC to use to connect
to that IP address? Condor is the first tool I've seen that needed to be
steered towards the correct NIC in a dual-NIC machine like this. Tools
like ssh and telnet were able to resolve which interface to use to
connect to mymaster.myoffice.com without my needing to coax them towards
one NIC or the other.

- Ian

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