Could not work with two NICs

Hi,

I was assigned as administrator of a HP-UX host which has three NICs
installed.


Lan0 is built in LAN interface which has IP address 192.168.0.25.lan1 &

lan2 are two 10/100Mbps ethernet card which has 10.10.10.12 &
10.10.10.13 configured. the host is connected to two L4 switches as
below


L4-switch-1 L4-switch-2
\ /

\ /
--------------- -----------
| |
----- port Lan1-------------- port Lan2 ----
| HP-UX B.11.11 U 9000/800 |


--------------------------------------------------------


Problem we are facing ( make ports on L4 switches always on)
1) Interface lan2 must be disabled on host to make L4-switch-1 find

10.10.10.12 is OK


2) if lan2 is enabled, both L4 swtich marked both 10.10.10.12 and
10.10.10.13 FAILED


3) if lan1 is disabled, lan2 is enabled on the host, the two L4
switches consider 10.10.10.12 & 10.10.10.13 FAILED;


4) when lan1 & lan2 are both enabled on host, I noticed lan1's
Ipkts & lan2's Opkts increase, but lan1's Opkts and Ian2'2 Ipkts does

not change at all


rar5> netstat -ni


Name Mtu Network Address Ipkts Ierrs Opkts
Oerrs Coll
lan2 1500 10.10.10.0 10.10.10.13 0 0 1353
0 0
lan1 1500 10.10.10.0 10.10.10.12 1922568 0 1918150
0 0
lan0 1500 192.168.1.0 192.168.1.25 59723842 0 66442227

0 18847
lo0 4136 127.0.0.0 127.0.0.1 50908 0
50908 0 0
rar5> netstat -ni
Name Mtu Network Address Ipkts Ierrs Opkts
Oerrs Coll
lan2 1500 10.10.10.0 10.10.10.13 0 0 1359
0 0
lan1 1500 10.10.10.0 10.10.10.12 1922575 0 1918150 0

0
lan0 1500 192.168.1.0 192.168.1.25 59724686 0 66443172
0 18847
lo0 4136 127.0.0.0 127.0.0.1 50908 0 50908

0 0
rar5>


I'm very new to HP-UX, I don't know what cause the problem? Is it
possible for NIC fault?


each word will be highly appreciated.


Joe

We should move this over to comp.sys.hp.hpux...

Basically, out of the box, HP-UX assumes that multiple physical (from
the point of view of the transport) NICs configured into the same IP
subnet have the same "connectivity." If that is not the case then
configuring multiple NICs into the same IP subnet isn't a good idea.

There are ways to make things work with the use of static routes
and/or setting ip_strong_es_model but the best way to have multiple
NICs in the same subnet is to install Auto Port Aggregation and
configure them into a link aggregate (aka trunk or link bonding what
have you).

A switch operating at layer 2 won't care about the host having
multiple NICs in the same subnet, but a "switch" operating at a layer
above layer 2 might. (Aguments about how such a device shouldn't
really be called a "switch" left to another discussion).

rick jones
--
oxymoron n, Hummer H2 with California Save Our Coasts and Oceans plates
these opinions are mine, all mine; HP might not want them anyway...
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...