Product

Brisque^® 5.0

Platform

All Brisque platforms

Operating system

IBM^® AIX^® 5.2

Symptoms

Changing the default gateway via smit is not saved after reboot, and the system resets to the previous default gateway.

Cause

AIX 5 networking works differently from previous versions, and enables multipath routing (see the AIX5 Red book for details).
As a result, the routing flushing does not remove the old gateway from the inet0, which is the main AIX internet device.

Solution

Remove the previous gateway manually:

1. To flush all defined gateways (routes), type route -n -f
2. Define the new gateway via smit TCP/IP (10.4.30.1).
3. To check the existence of the previous gateway (10.4.26.1): type netstat -rn The following appears:
   Routing tables
Destination Gateway Flags Refs Use If PMTU Exp Groups
Route tree for Protocol Family 2 (Internet)
default    10.4.30.1   UGc   0    0      en0   -   -
default    10.4.30.1   UGHW  0    2253   en0   -   1
default    10.4.30.1   UGHW  0    1      en0   -   -
default    10.4.31.253 UGb   0    0      en0   -   - =>
4. To check if the old route (10.4.26.1) still exists in inet0 device, type lsattr -El inet0 The following appears:
   authm  65536  Authentication Methods  True
bootup_option no  Serial Optical Network Interface  True
gateway  Gateway  True
hostname  timna5  Host Name  True
rout6  FDDI Network Interface   True
route  net,-hopcount,0,,0,10.4.26.1  Route  True
5. To check the ODM for the stanza for the old route, type
   odmget CuAt|grep 10.4.26.1 The following could appear value="net,-hopcount,0,,0,10.4.26.1"
6. To delete the old reoute from ODM, type
   odmdelete -o CuAt -q value="net,-hopcount,0,,0,10.4.26.1"
7. To check that new route (10.4.30.1) is defined in inet0, type lsattr -El inet0 The following appears:
   authm 65536 Authentication Methods True
bootup_option no Serial Optical Network Interface True
gateway Gateway True
hostname timna5 Host Name True
rout6 FDDI Network Interface True
route net,-hopcount,0,,0,10.4.30.1 Route True
8. To run bosboot and reboot the machine, type
   bosboot -a -d hdiskX
   where X is the number of the system disk. The following appears:
   bosboot: Boot image is 18180 512 byte blocks
9. Reboot all Macintosh and Windows clients that are connected to this Brisque machine.

Technical contact(s)

Lev Weissman

Submitted by

Lev Weissman

Date submitted

28 Nov 2005