IV04754: CFGIF INCORRECTLY HANDLE ALIASES WITH SAME ADDRESS AS DEFAULT APPLIES TO AIX 5300-12

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• If an interface is configured with :
  alias4        10.xx.xx.19,255.255.0.0
  alias4        10.xx.xx.36,255.255.0.0
  netaddr       10.xx.xx.19
  netmask       255.255.0.0
  See one of alias4 is same as netaddr, cfgif will
  configure
  10.xx.xx.19 with default mask instead if one set in
  netmask.
  netstat -i will show :
  en0   1500  10  <incorrect network   10.xx.xx.19
  en0   1500  10.xx  10.xx.xx.36    0 0 20 20 0
  ifconfig will also give wrong netmask and broadcast :
  en0: flags=...
  inet 10.xx.xx.19 netmask 0xff000000 broadcast
  10.255.255.255  ==> incorrect netmask & broadcast
  inet 10.xx.xx.36 netmask 0xffff0000 broadcast
  10.xx.255.255
  Note: When this will be fixed, if one set both netaddr
  and alias4 with same address but with different netmasks
  the netmask from alias4 will prevail as it is added last
  and we can't get two different netmasks for same address.
  

Local fix

• Don't add aliases with same address as original one on
  interfaces.
  

Problem summary

• If chdev is used to create an alias to a network interface
  with the same ip address as the primary ip address, and reboot
  the machine, /usr/lib/methods/chgif command which is invoked
  at the boot time, can configure the ip address with the wrong
  netmask.
  

Problem conclusion

• Modified the code of chgif to use the correct netmask while
  configuring an alias.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IV01241

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  AIX 5.3

• Fixed component ID

  5765G0300

Applicable component levels

• R530 PSY U844647

     UP11/10/10 I 1000

PTF to Fileset Mapping

• U844647 bos.net.tcp.client 5.3.12.5