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IV01743: CFGIF INCORRECTLY HANDLE ALIASES WITH SAME ADDRESS AS DEFAULT APPLIES TO AIX 7100-01

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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 number
    IV01743
    • 

  • Reported component name
    AIX V7.1
    • 

  • Reported component ID
    5765H4000
    • 

  • Reported release
    710
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2011-06-13
    • 

  • Closed date
    2011-06-13
    • 

  • Last modified date
    2013-04-07
    • 





    

  • 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 V7.1
    • 

  • Fixed component ID
    5765H4000
    • 



Applicable component levels


    

  • R710  PSY  U838091
       UP11/10/05  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            07 April 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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