Why can't the SCTP module parameters 'rto_alpha_exp_divisor' and 'rto_beta_exp_divisor' be modified in RHEL6?
Issue
- In RHEL6, the SCTP parameters
rto_alpha_exp_divisorandrto_beta_exp_divisorremain read-only under/proc/sys/net/sctp:
# ll /proc/sys/net/sctp/rto_[ab]*
-r--r--r-- 1 root root 0 Mar 26 11:07 /proc/sys/net/sctp/rto_alpha_exp_divisor
-r--r--r-- 1 root root 0 Mar 26 11:07 /proc/sys/net/sctp/rto_beta_exp_divisor
#
- Changing the values using the command
sysctland via the file/etc/sysctl.conffails. Also trying to echo new values fails:
# cat rto_alpha_exp_divisor
3
# echo 10 > rto_alpha_exp_divisor
bash: rto_alpha_exp_divisor: Permission denied
# echo 10 > rto_beta_exp_divisor
bash: rto_beta_exp_divisor: Permission denied
Environment
- Red Hat Enterprise Linux 6
- SCTP module
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