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IV46819: DEFAULT GATEWAY IS REMOVED WHEN IPADDRESS IS CHANGED BY IFCONFIG APPLIES TO AIX 7100-03

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APAR status

  • Closed as program error.

Error description

  • When IP address of an interface is changed by ifconfig
command, default gateway route entrie are also deleted
unexpectely due to the change introduced by APAR IV26939.

For example,

# netstat -rn
Routing tables
Destination   Gateway      Flags Refs Use  If Exp Groups

Route Tree for Protocol Family 2 (Internet):
default       9.187.201.1  UG     0     0 en0    -     -
9.187.201.0   9.187.201.62 UHSb   0     0 en0    -     -
 =>
9.187.201/25  9.187.201.62 U      2  2550 en0    -     -
9.187.201.62  127.0.0.1    UGHS   0    10 lo0    -     -
9.187.201.127 9.187.201.62 UHSb   0     0 en0    -     -
127/8         127.0.0.1    U     13   440 lo0    -     -

Route Tree for Protocol Family 24 (Internet v6):
::1%1         ::1%1        UH     1  2104 lo0    -     -

# ifconfig en0 9.187.201.61 netmask 255.255.255.128 up

# netstat -rn
Routing tables
Destination   Gateway      Flags Refs Use  If Exp Groups

Route Tree for Protocol Family 2 (Internet):
9.187.201.0   9.187.201.61 UHSb   0     0 en0    -     -
 =>
9.187.201/25  9.187.201.61 U      0     1 en0    -     -
9.187.201.61  127.0.0.1    UGHS   0     0 lo0    -     -
9.187.201.127 9.187.201.61 UHSb   0     0 en0    -     -
127/8         127.0.0.1    U     13   440 lo0    -     -

Route Tree for Protocol Family 24 (Internet v6):
::1%1         ::1%1        UH     2  2106 lo0    -      -

Because of this, external communications could be lost
when
IP address is changed in this way.

Local fix

  • 



Problem summary


    

  • Default routes may be missing after changing the IP of an
interface through 'ifconfig' command.

    



Problem conclusion


    

  • Code modified to not delete the default route on changing the
IP

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV46819
    • 

  • Reported component name
    AIX V7.1
    • 

  • Reported component ID
    5765H4000
    • 

  • Reported release
    710
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2013-08-08
    • 

  • Closed date
    2013-08-08
    • 

  • Last modified date
    2014-02-14
    • 





    

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

    
IV45375
    

    • 

  • 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  U854680
       UP13/11/22  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            14 February 2014
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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