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Full Discussion: AIX - NIC device explanation need
Operating Systems AIX AIX - NIC device explanation need Post 303035121 by Phat on Wednesday 15th of May 2019 01:30:40 AM
Old 05-15-2019
AIX - NIC device explanation need
Hello,

I have some doubt about the NIC device on my AIX box.
When using lsdev command
Code:
[root@xxx] / > lsdev -Cc adapter | grep en
ent0 Available 03-00 2-Port 10/100/1000 Base-TX PCI-Express Adapter (14104003)
ent1 Available 03-01 2-Port 10/100/1000 Base-TX PCI-Express Adapter (14104003)
ent2 Available 04-00 2-Port 10/100/1000 Base-TX PCI-Express Adapter (14104003)
ent3 Available 04-01 2-Port 10/100/1000 Base-TX PCI-Express Adapter (14104003)
ent4 Available       Virtual I/O Ethernet Adapter (l-lan)
ent5 Available       EtherChannel / IEEE 802.3ad Link Aggregation
ent6 Available       Virtual I/O Ethernet Adapter (l-lan)

If I check the physical location of NICs
Code:
[root@xxx] / > lsdev -C -H -F "name status physloc location description" | grep en
en0          Defined                                                                  03-00       Standard Ethernet Network Interface
en1          Defined                                                                  03-01       Standard Ethernet Network Interface
en2          Defined                                                                  04-00       Standard Ethernet Network Interface
en3          Defined                                                                  04-01       Standard Ethernet Network Interface
en4          Available                                                                            Standard Ethernet Network Interface
en5          Available                                                                            Standard Ethernet Network Interface
en6          Available                                                                            Standard Ethernet Network Interface
ent0         Available U5802.001.9K84585-P1-C4-T1                                     03-00       2-Port 10/100/1000 Base-TX PCI-Express Adapter (14104003)
ent1         Available U5802.001.9K84585-P1-C4-T2                                     03-01       2-Port 10/100/1000 Base-TX PCI-Express Adapter (14104003)
ent2         Available U5877.001.9K8I925-P1-C4-T1                                     04-00       2-Port 10/100/1000 Base-TX PCI-Express Adapter (14104003)
ent3         Available U5877.001.9K8I925-P1-C4-T2                                     04-01       2-Port 10/100/1000 Base-TX PCI-Express Adapter (14104003)
ent4         Available U9117.MMD.06528F7-V13-C2-T1                                                Virtual I/O Ethernet Adapter (l-lan)
ent5         Available                                                                            EtherChannel / IEEE 802.3ad Link Aggregation
ent6         Available U9117.MMD.06528F7-V13-C3-T1                                                Virtual I/O Ethernet Adapter (l-lan)
inet0        Available                                                                            Internet Network Extension
rcm0         Defined                                                                              Rendering Context Manager Subsystem

I can see we have en1 ... en6 (without 't') and ent1....ent6.
What is the difference between the en1 and ent1 and so on ... ?

If checking the IP, I can see only "enX" (again without 't')
Code:
[root@DB_BI] / > ifconfig -a
en4: flags=1e080863,480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
        inet x.x.x.x netmask 0xffffff00 broadcast x.x.x.x
         tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
en6: flags=1e080863,480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
        inet y.y.y.y netmask 0xfffff800 broadcast y.y.y.y
        inet z.z.z.z netmask 0xfffff800 broadcast z.z.z.z
         tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
en5: flags=1e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
        inet u.u.u.u netmask 0xfffff800 broadcast u.u.u.u
         tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0
lo0: flags=e08084b,c0<UP,BROADCAST,LOOPBACK,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,LARGESEND,CHAIN>
        inet 127.0.0.1 netmask 0xff000000 broadcast 127.255.255.255
        inet6 ::1%1/0
         tcp_sendspace 131072 tcp_recvspace 131072 rfc1323 1

If I check with smitty tcpip, I see another "etX"
Code:
 en0   03-00   Standard Ethernet Network Interface                      |
                             |   en1   03-01   Standard Ethernet Network Interface                      |
                             |   en2   04-00   Standard Ethernet Network Interface                      |
                             |   en3   04-01   Standard Ethernet Network Interface                      |
                             |   en4           Standard Ethernet Network Interface                      |
                             |   en5           Standard Ethernet Network Interface                      |
                             |   en6           Standard Ethernet Network Interface                      |
                             |   et0   03-00   IEEE 802.3 Ethernet Network Interface                    |
                             |   et1   03-01   IEEE 802.3 Ethernet Network Interface                    |
                             |   et2   04-00   IEEE 802.3 Ethernet Network Interface                    |
                             |   et3   04-01   IEEE 802.3 Ethernet Network Interface                    |
                             |   et4           IEEE 802.3 Ethernet Network Interface                    |
                             |   et5           IEEE 802.3 Ethernet Network Interface                    |
                             |   et6           IEEE 802.3 Ethernet Network Interface

I notice only enX could have IP configured, etX not.
Code:
                                                        [Entry Fields]
* HOSTNAME                                           [xxx]
* Internet ADDRESS (dotted decimal)                  [x.x.x.x]
  Network MASK (dotted decimal)                      [255.255.255.0]
* Network INTERFACE                                   en4
  NAMESERVER
           Internet ADDRESS (dotted decimal)         [x.x.x.x]
           DOMAIN Name                               [dfs]
  Default Gateway
       Address (dotted decimal or symbolic name)     [x.x.x.x]
       Cost                                          [0]                                                                             #
       Do Active Dead Gateway Detection?              no                                                                            +
  Your CABLE Type                                     N/A                                                                           +
  START Now                                           no   


* HOSTNAME                                           [xxx]
* Internet ADDRESS (dotted decimal)                  []
  Network MASK (dotted decimal)                      []
* Network INTERFACE                                   et4
  NAMESERVER
           Internet ADDRESS (dotted decimal)         [y.y.y.y]
           DOMAIN Name                               [abc]
  Default Gateway
       Address (dotted decimal or symbolic name)     [y.y.y.y]
       Cost                                          [0]                                                                             #
       Do Active Dead Gateway Detection?              no                                                                            +
  Your CABLE Type                                     N/A                                                                           +
  START Now                                           no

Another thing, If look again the ifconfig, can see that en6 and en5 has 1 same IP 10.176.x.65 --> how can it?
Code:
en6: flags=1e080863,480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
        inet 10.176.x.65 netmask 0xfffff800 broadcast 10.176.39.255
        inet 10.176.x.127 netmask 0xfffff800 broadcast 10.176.39.255
         tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
en5: flags=1e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
        inet 10.176.x.65 netmask 0xfffff800 broadcast 10.176.39.255

en6 has 2 IPs, but look in the smitty, just see only 1 IP 10.176.x.65 so where to configure the second IP 10.176.x.127???
Code:
* HOSTNAME                                           [xxx]
* Internet ADDRESS (dotted decimal)                  [10.176.x.65]
  Network MASK (dotted decimal)                      [255.255.248.0]
* Network INTERFACE                                   en6
  NAMESERVER
           Internet ADDRESS (dotted decimal)         [10.176.33.81]
           DOMAIN Name                               [dfs]
  Default Gateway
       Address (dotted decimal or symbolic name)     [10.176.32.1]
       Cost                                          [0]                                                                             #
       Do Active Dead Gateway Detection?              no                                                                            +
  Your CABLE Type                                     N/A                                                                           +
  START Now                                           no                                                                            +

 

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