feature of `packet per second`
Julian Elischer
julian at freebsd.org
Fri May 2 05:56:06 UTC 2014
On 5/1/14, 12:02 AM, bycn82 wrote:
> 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>
> Thanks for your reply, and it is good to know the sysctl for ICMP.
>
> finally it works.I just added a new `action` in firewall and it is
> called `pps`, that means it can be generic purpose while the
> net.inet.icmp.icmplim is only for ICMP traffic.
you probably should be using the dummynet extension to ipfw to do this
but post your changes to a freebsd bug report anyhow so we can keep it
somewhere.
I doubt it would be needed in general as Dummynet give you so much
more control and is I think a superset.
Don't forget to add a patch for the man page.... a patch with no man
page change would never be accepted.
>
> the usage will be like below
>
> root at F10:/usr/src/sbin/ipfw # .*/ipfw add pps 1 icmp from any to any*
> 00100 pps 1 icmp from any to any
> root at F10:/usr/src/sbin/ipfw # ./ipfw show
> 00100 9 540 pps 1 icmp from any to any
> 65535 13319 1958894 allow ip from any to any
> root at F10:/usr/src/sbin/ipfw #
>
> regards,
> bycn82
>
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>
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