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Adding Second nic in Solaris 10

Posted on 2008-10-13
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Last Modified: 2013-12-27
I am tring to add a second nic in a T1000 running Solaris 10. After I add the nic with the config as follows:

bge0: flags=1000803<UP,BROADCAST,MULTICAST,IPv4> mtu 1500 index 2
        inet 192.168.1.67 netmask ffffff00 broadcast 192.168.1.255
        ether 0:21:28:10:a3:d0
bge1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 3
        inet 192.168.1.68 netmask ffffff00 broadcast 192.168.1.255
        ether 0:21:28:10:a3:d1

Evrething works fine but if I unplug the first nic there is no trafic in the server.
why I can not use the second nic if I unplug the first one even if the second nic is pluged and is running?

Thank you
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Question by:smurgu
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Expert Comment

by:omarfarid
ID: 22704648
if you run

ifconfig -a

what do you get?

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Author Comment

by:smurgu
ID: 22704696
I post that in my question.
bge0: flags=1000803<UP,BROADCAST,MULTICAST,IPv4> mtu 1500 index 2
        inet 192.168.1.67 netmask ffffff00 broadcast 192.168.1.255
        ether 0:21:28:10:a3:d0
bge1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 3
        inet 192.168.1.68 netmask ffffff00 broadcast 192.168.1.255
        ether 0:21:28:10:a3:d1
The fist interface is not running because I unplug the cable to see if the second one is working when the fisrt one is down.
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Expert Comment

by:omarfarid
ID: 22704732
when you say unplug the first nic, do you mean the cable?

Also, why do you haveboth nics in the same subnet?
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Author Comment

by:smurgu
ID: 22704787
Yes I unplug the cable.

Its not my network, and I don't have any control over its configuration. I need to use the second nic in case the first one fails without IPMP or link aggregation.
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Expert Comment

by:omarfarid
ID: 22704826
can you show the output of

netstat -rn

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Author Comment

by:smurgu
ID: 22704831
Routing Table: IPv4
  Destination           Gateway           Flags  Ref     Use     Interface
-------------------- -------------------- ----- ----- ---------- ---------
default              192.168.1.161        UG        1        100          
192.168.1.0          192.168.1.67         U         1          4 bge0      
192.168.1.0          192.168.1.68         U         1          0 bge1      
224.0.0.0            192.168.1.67         U         1          0 bge0      
127.0.0.1            127.0.0.1            UH        4        117 lo0    
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Expert Comment

by:omarfarid
ID: 22704891
OK, from the routing table, the network 192.168.1.0 is reachable through bge0 and bge1

If you shutdown the bge0 interface with

ifconfig bge0 down

do you still get the problem?
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Author Comment

by:smurgu
ID: 22704926
No if I put that interface down it works but I have to switches and each nic is plug in a diferent switch. I need to be able to send and receive trafic if one of the switch is down.
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Accepted Solution

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omarfarid earned 500 total points
ID: 22705008
If not mistaken, this has to do with IP routing since the system see a valid route to the subnet on that interface and then try to use it. since you don't want to use IPMP (which will give what you want), then I am afraid that you need a script on the server itself to monitor the interfaces and bring down the one that shows that it is unplugged
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Author Comment

by:smurgu
ID: 22705624
can you give me an example of the script and also if you can tell me how this script will detect the link-failure. I know this is a diferent question than the original one let me know if I have to close this and open a new question.

Thank you,
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Expert Comment

by:omarfarid
ID: 22706173
Sorry that you closed the question before reaching a solution, but you can try to see if you can run snmp

and use

/usr/sfw/bin/snmpwalk

to get the interface status then try to do something.

Also you may try

/usr/sbin/ndd -get  /dev/bge  link_status

But I do not have two interfaces to test with and see what it return
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