Problem : IBM AIX : how to change the interface mode from PROMISC to SIMPLEX

January 27, 2021

Problem : IBM AIX : how to change the interface mode from PROMISC to SIMPLEX

en5: options=e080963<up,broadcaST,NOTRAILERS,RUNNING,PROMISC,SIMPLEX,MULTICAST,GROUPRT,64BIT>
inet 172.30.27.134 netmask 0xffffff80 broadcast 172.30.27.255
inet 172.30.27.137 netmask 0xffffff80 broadcast 172.30.27.255
inet 172.30.27.138 netmask 0xffffff80 broadcast 172.30.27.255
inet 172.30.27.139 netmask 0xffffff80 broadcast 172.30.27.255
inet 172.30.27.140 netmask 0xffffff80 broadcast 172.30.27.255
en6: options=e080863<up,broadcaST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT>
inet 172.30.21.134 netmask 0xffffff80 broadcast 172.30.21.255
inet 172.30.21.138 netmask 0xffffff80 broadcast 172.30.21.255
lo0: options=e08084b<up,broadcaST,LOOPBACK,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT>
inet 127.0.0.1 netmask 0xff000000 broadcast 127.255.255.255
inet6 ::1/0

for the interface en5 I need to change the mode PROMISC to SIMPLEX on an IBM AIX machine

How to do so ?</up,broadca</up,broadca</up,broadca

Solution : IBM AIX : how to change the interface mode from PROMISC to SIMPLEX

Which version of AIX do you use?

Afaik, at least the ifconfig commands of 5.2, 5.3 and 6.1 do not know about a promisc parameter and will return 0821-508 “bad value”.

Did you try ifconfig en5 promisc yourself? Does it work? If it does, this functionality might be interface-type dependent. You should then also be able to reset PROMISC mode by issuing ifconfig en5 –promisc

wmp