About the usage of a dual port card

Thomas Lorenzen tl at theory.ki.ku.dk
Wed Oct 3 07:51:23 EDT 2001


     Hi'

   In our linux cluster our server has a dual port intel
nic. Both ports are configured to be on the same net as are
all the clients of the cluster. The clients boot as diskless
clients using the server.

   My question is, if there is a way to make a specific
interface, to which a packet comes, also answer this
request. What happens at the moment is, that if one pings
eth2, then eth1 answers, and in general eth1 answers all
requests unless this line is saturated, in which case eth2
takes over. This is immediately seen from the output of RX
and TX records below.

   Below I present the relevant output of ifconfig.

eth1      Link encap:Ethernet  HWaddr 00:03:47:3B:27:EE  
          inet addr:192.168.200.100  Bcast:192.168.200.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:399607 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1070472 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          Interrupt:19 Base address:0x4000 
eth2      Link encap:Ethernet  HWaddr 00:03:47:3B:27:EF  
          inet addr:192.168.200.200  Bcast:192.168.200.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:142634 errors:0 dropped:0 overruns:0 frame:0
          TX packets:104 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          Interrupt:16 Base address:0x6000 

   Below I present the relevant output of route.

192.168.200.0   *               255.255.255.0   U     0 0 0 eth1
192.168.200.0   *               255.255.255.0   U     0 0 0 eth2

   In brief I would like, that if I contact an interface
ethX using ping, say, then that particular interface ethX
should also answer the request. Would anybody know of the
possibility of doing so and what is in that case the trick
to do.

   Thanks for any help in advance.

   Best Regards.

     Thomas.

----------------------------------------------------------------------
Cand. Scient. Thomas Lorenzen               Phone : (+ 45) 35 32 02 50
Department of Chemistry                       Fax : (+ 45) 35 32 02 59
University of Copenhagen                     Mail : tl at theory.ki.ku.dk
DK, 2100 Copenhagen, Denmark   Homepage : http://theochem.ki.ku.dk/~tl
----------------------------------------------------------------------



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