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

["Ian Chesal" <ICHESAL@xxxxxxxxxx>]

For this one-off case I can probably negotiate this. Thanks.

- Ian 

> -----Original Message-----
> From: condor-users-bounces@xxxxxxxxxxx 
> [mailto:condor-users-bounces@xxxxxxxxxxx] On Behalf Of Philip Crawford
> Sent: Monday, January 17, 2005 8:17 PM
> To: 'Condor-Users Mail List'
> Subject: RE: [Condor-users] Using multiple NICs on a machine 
> that gets anIPfrom 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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