Hello,

On Aix 5.2, we changed the parameters tcp_keepinit, tcp_keepintvl and tcp_keepidle with the no command.

tunrestore -R is present in inittab

in the directory /etc/tunables we can clearly see the inclusion of parameters during reboot, including the file lastboot.log

  root#/etc/tunables#ls -ltr
total 40
-rw-r--r--   1 root     system          493 Nov  5 17:38 nextboot
-rw-r--r--   1 root     system          334 Dec  3 17:39 lastboot.log
-rw-r--r--   1 root     system        11735 Dec  3 17:39 lastboot

  root#/etc/tunables#grep keep nextboot
       tcp_keepinit = "40"
       tcp_keepintvl = "20"
       tcp_keepidle = "600"

  root#/etc/tunables#grep keep lastboot.log
Setting tcp_keepidle to 600
Setting tcp_keepinit to 40
Setting tcp_keepintvl to 20
  
root#/etc/tunables#grep keep lastboot
       ndpt_keep = "120"               # DEFAULT VALUE
       tcp_keepcnt = "8"               # DEFAULT VALUE
       tcp_keepidle = "600"
       tcp_keepinit = "40"
       tcp_keepintvl = "20"

  root#/etc/tunables#no -L | grep keep |grep -v cnt |grep -v ndpt
tcp_keepidle              6840   14400  600    1      8E-1   halfsecond  C
tcp_keepinit              40     150    40     1      8E-1   halfsecond  D
tcp_keepintvl             110    150    20     1      32K-1  halfsecond  C
  
root#/etc/tunables#no -a | grep keep |grep -v cnt |grep -v ndpt
            tcp_keepidle = 6840
            tcp_keepinit = 40
tcp_keepintvl = 110

  root#/etc/tunables#lsattr -E -l sys0 |grep pre520
pre520tune      disable               Pre-520 tuning compatibility mode    
      True