Changing icplim

[whistlepigger]

By default, net.inet.icmp.icmplim is set to 200 to perform icmp rate limiting.

According to the freebsd documentation, I can turn this off in 2 ways:
- editing /etc/sysctl.conf and adding the line net.inet.icmp.icmplim=0
- issuing a sysctl -w net.inet.icmp.icmplim=0

How can I make this permanently happen in freeNAS8 ? It appears that sysctl.conf gets rebuilt at startup, and if I add this line to /boot/loader.conf (after a mount -uw /), the entry is there in loader.conf after a reboot, but it seems to get ignored. Version 7x had areas in the GUI where you could set or modify parameters, but Version 8 seems to hide all this.

There are other settings, such as net.link.ether.inet.log_arp_movements, that I'd also like to change... so if I figure out how to set icplim, that might help with the others.

Thanks.

 

[ohnename]

According to the freebsd documentation, I can turn this off in 2 ways:
- editing /etc/sysctl.conf and adding the line net.inet.icmp.icmplim=0

make your changes in /conf/base/etc (after a mount -uw /) because thats whats read on boot, it is also automatically changed in /etc after a reboot.

 

[whistlepigger]

Thanks ohnename..

I changed my file in /conf/base/etc, and the changes are persistent after a reboot, but the version in /etc does not reflect this:

#cat /conf/base/etc/sysctl.conf
... comments removed ...
kern.metadelay=3
kern.dirdelay=4
kern.filedelay=5
net.inet.icmp.icmplim=0

#cat /etc/sysctl.conf
vfs.nfsrv.async=0
kern.metadelay=3
kern.dirdelay=4
kern.filedelay=5

 

[ohnename]

It seems that FN8 is using a custom file located at /conf/base/etc/rc.d/ix-sysctl
Add it there (after the 3 default lines) and it should be at /etc/sysctl.conf after a reboot

 

[whistlepigger]

Worked great! Thanks.

Too bad that we have to go hacking and embedding lines like that though.
If I apply updates in the future, I may have to hack it again.
I vote we bring back a mechanism for light customization.
:)