PH30839: LB DOESN'T DETECT NETMASK 255.255.255.128 AND HIGHER

APAR status

• Closed as program error.

Error description

• When LB is deployed on a small subnet, forwarding may not work
  as expected because LB does not detect netmask of
  255.255.255.128 and higher on AIX.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  IBM WebSphere Application Server Load       *
  *                  Balancer for IPv4 and IPv6 users on AIX     *
  ****************************************************************
  * PROBLEM DESCRIPTION: Load balancer does not                  *
  *                      recognize local subnet mask higher      *
  *                      than 255.255.255.128 (prefix 26)        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When the executor is started, Load Balancer determines local
  interface information such as network mask. If the local
  subnet mask is greater than 255.255.255.128 (prefix 26), the
  load balancer will use mask 255.255.255.128 (prefix 26)
  instead of the actual mask. This can affect packet forwarding
  and give false errors that servers are not on the same subnet
  as the load balancer.
  

Problem conclusion

• Corrected the code to calculate the mask accurately.
  
  Fix levels:
     8.5.5.19
     9.0.5.7
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  WS EDGE LB IPV4

• Fixed component ID

  5724H8812

Applicable component levels