I’m using balance 380 could peplink support a daily download/upload quota on a WAN link.
Hello,
Peplink does not have support for a daily quota for each WAN. You can enable a monthly quota in the WAN Settings.
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Hello @mostafa,
You can setup daily quotas by using the captive portal features of most Peplink/Pepwave models.
There is several previous posts on how to have daily limits using the captive portal within the form.
Happy to Help,
Marcus 
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thank you all for your valuable help.
1- as for the monthly quota i mentioned before for the client but he refused as it may block the traffic at the early days of the month which will make trouble in the network and for the user he is looking for an automated solution for each day and i’ve mentioned that is not available yet through peplink.
2- i found the captive port will solve the problem however the client is masquerading the traffic toward the peplink using firewall nating rule which will not be feasible?!