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AIX Server TBCM Startup Failure When IPv6 Exists in Network Interface

Document Type | Troubleshooting 

Category | Administration

Applicable Product Versions | 5SP1FS01, 5SP1FS02, 5SP1FS03, 5SP1FS04, 5SP1FS06, 6FS01, 6FS02, 6FS03, 6FS04, 6FS05, 6FS06

Document Number | TADTS022

 

Issue

When even a single IPv6 exists among the network interfaces, the AIX server TBCM startup fails.
 
If AIX server TBCM startup fails 
- cm.log
[ERROR] Cannot get ifname from IP address A.B.C.101
 
CM Resource is registered normally but not found, causing TBCM startup failure
(Occurs when a network interface registered earlier in the OS than the interface used by TBCM (en2), such as en1, has an IPv6 address)
ifconfig -a
en4: flags=1e084863,80480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
       inet A.B.C.101 netmask 0xffffff00 broadcast A.B.C.255
        tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
en1: flags=1e084863,80480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
       inet A.B.2.101 netmask 0xffffff00 broadcast A.B.C.2.255
       inet6 fe80::f816:3eff:fe87:aca8/64
        tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
en2: flags=1e084863,80480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
       inet A.B.C.111 netmask 0xffffff00 broadcast A.B.C.255
        tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
en3: flags=1e084863,80480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
       inet A.B.C.101 netmask 0xffffff00 broadcast A.B.C.255
        tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1

 

Cause

When obtaining network interface information via ioctl on AIX, if an earlier network interface than the one registered in TBCM has an inet6 IP, TBCM cannot accurately recognize this information and fails to start.

 

Solutions

1. Attempt to resolve the error by applying an alternative solution.

Note
 
Alternative Solution
  1. Disable IPv6

  2. Change the order of network interfaces registered in the OS (reroute so that the network interface registered with IPv6 (en1) is registered after the interface used by TBCM (en2))

    ifconfig
en4: flags=1e084863,80480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
       inet A.B.C.101 netmask 0xffffff00 broadcast A.B.C.255
        tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
en2: flags=1e084863,80480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
       inet A.B.C.111 netmask 0xffffff00 broadcast A.B.C.255
        tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
en1: flags=1e084863,80480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
       inet A.B.2.101 netmask 0xffffff00 broadcast A.B.C.2.255
       inet6 fe80::f816:3eff:fe87:aca8/64
        tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
en3: flags=1e084863,80480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
       inet A.B.C.101 netmask 0xffffff00 broadcast A.B.C.255
        tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
 

2. Apply the patch. (Patch applied: 121498a)

To enable TBCM to start normally, apply the 121498a patch that improves the recognition of variable length of Network Interfaces to resolve the error.
(※Apply this patch if an inet6 IP exists on an earlier network interface than the one registered as interface in TBCM)

Caution
Apply the patch through technical support provided by TmaxTibero.
 
 
 

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