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Thread: Dual nic on a server
Dual nic on a server
country flaguser name
Canada		 2007-10-15 11:54:46 

  


  

    Hi,

 



If I have a Silicon 
Mechanics server with two NICs connected to different networks. When I send a 
packet to a remote host, it goes through my routing tables and sends the message 
out the correct interface with it's corresponding IP address as the source IP. 
Every now and then I see some packets go out on that same interface but with the 
IP address assigned to the other interface as the source IP.


 



My question is, how 
does the OS choose what IP address to use as the source IP? I thought that it 
was going to go through the routing tables, choose the interface and then put 
the IP associated with that interface as the source, but it looks like it is not 
always doing that. ANy ideas?



 



Thanks,


 



Luis Emilio Fernandez de Jáuregui
Sr. 
MSS GSM/UMTS Lab Infrastructure
Nortel
nortel.com">luisfnortel.com
Telephone (972) 684 
1472 / ESN 444 1472
Fax (972) 684 3715


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    Re: Dual nic on a server
  


  

     user name

     2007-10-15 13:53:01
  


  

    

  


  

    Hi Luis, perhaps if you post your query on the YDL General list you could find persons with a wider skill set better able to respond.  As I understand it, the list where you originally posted your query is intended for absolute beginners in Linux.

On Oct 15, 2007, at 12:54 PM, Luis Fernandez De Jauregui wrote:

 
Hi,
 
 
 
If I have a Silicon Mechanics server with two NICs connected to different networks. When I send a packet to a remote host, it goes through my routing tables and sends the message out the correct interface with it's corresponding IP address as the source IP. Every now and then I see some packets go out on that same interface but with the IP address assigned to the other interface as the source IP.
 
 
 
My question is, how does the OS choose what IP address to use as the source IP? I thought that it was going to go through the routing tables, choose the interface and then put the IP associated with that interface as the source, but it looks like it is not always doing that. ANy ideas?
 
 
 
Thanks,
 
 
 
Luis Emilio Fernandez de Jáuregui
Sr. MSS GSM/UMTS Lab Infrastructure
Nortel
 luisfnortel.com">luisfnortel.com
Telephone (972) 684 1472 / ESN 444 1472
Fax (972) 684 3715
 
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