where should rate limiting set?

[Maivoko]

i read book that 

this set in ISP side, set outbound direction port output to our router

is it right?

if ISP not willing to do this in their side

can i set it in my own side in the inbound direction port of our side 's router to limit the traffic from output to inside?

[Philip D'Ath]

Of course you can.  It is your router.

[Joseph W. Doherty]

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Posting

As noted by Philip, you (generally) can, but if would be unusual for an ISP not to enforce subrate bandwidth, but if they didn't, why would you wish to do it?

[Maivoko]

just want to mitigate DDos attack

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

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In no event shall Author be liable for any damages wha2tsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

Well, yes, you could filter out DDoS traffic from going further inside, but likely your ingress link will continue to be saturated and that, alone, often is a denial of service attack.