feature of `packet per second`

[bycn82]

On 4/30/14 23:45, Freddie Cash wrote:
> On Wed, Apr 30, 2014 at 8:31 AM, bycn82 <bycn82 at gmail.com 
> <mailto:bycn82 at gmail.com>>wrote:
>
>     On 4/30/14 23:01, Julian Elischer wrote:
>
>         On 4/30/14, 8:52 PM, bycn82 wrote:
>
>             Hi
>
>             `packet per second` it is easy to be implemented using
>             iptables, there is a module named `recent`, but in using
>             ipfw, Do we have any solution to fulfill it? check the
>             link below
>             https://forums.freebsd.org/viewtopic.php?f=44&t=42933&p=258441#p258441
>             <https://forums.freebsd.org/viewtopic.php?f=44&t=42933&p=258441#p258441>
>
>
>         since I don't use linux.. what is "packet per second"?.. does
>         it report it or set a limit on it?
>
>
>              bycn82
>
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>
>
>
>     Yes, "Packets Per Second"means limit a connection based on the
>     packets number, for example, If I allow 2 ICMP packets come to my
>     server in each individual second.  only the first 2 packets will
>     be allow, all others in the same second will be dropped.
>
>
> ​For ICMP, specifically, there's a sysctl to control the rate (per 
> second):
>
> # sysctl -d ​net.inet.icmp.icmplim
> net.inet.icmp.icmplim: Maximum number of ICMP responses per second
>
>
> For everything else, you'd want to use dummynet(4).
>
> -- 
> Freddie Cash
> fjwcash at gmail.com <mailto:fjwcash at gmail.com>

Hi
As Freddie said, for ICMP protocal, actually it comes with this 'PPS' 
feature.

So I just double checked the source code of ip_icmp.c file because I 
dont know this before.
And suddenly a question came into my mind. "Why I dont know it before"
Yes, I can list down all the sysctl option by `sysctl -a` command, But 
we dont have any page which introduced all the options,

root at FB10Head:~ # sysctl -a | grep rexmit_min
net.inet.tcp.rexmit_min: 30
root at FB10Head:~ # sysctl -a | grep icmplim
net.inet.icmp.icmplim: 200
net.inet.icmp.icmplim_output: 1
root at FB10Head:~ # sysctl -a | wc -l
     4120
root at FB10Head:~ #

So, more than 4000 options!!! Maybe we should have mail-list to collect 
the introduction of all the options or a public WiKi page like wikipedia 
for it.

Regards,
bycn82