Description
When configuring L7 DDoS Profiles, CAPTCHA is one of the available mitigation actions.
See How to Configure New L7 DDoS Profiles for more details.
Environment
- Silverline Portal
- L7 DDoS Profiles v3 (updated in Jan 2020)
- Proxy / Proxied customers
Procedure
CAPTCHA Settings
1. Click "View CAPTCHA Settings" to configure CAPTCHA.
- Profile must be in Blocking Mode to see the CAPTCHA Settings
- Seconds (i.e. 120 seconds in image below) are the amount of time the client is allowed to attempt the CAPTCHAs before mitigation moves onto rate-limiting.
2. In pop-up, configure the First Response Type and Failure Response type.
| Response Type | Description |
| First Response Type |
|
| Failure Response Type |
|
Custom CAPTCHA
If you want to use a custom script, you can follow the instructions below.
1. From either Response Type drop-down, select Custom option.
2. Enter HTML with custom variables.
You can use the following variables within the challenge or response:
| Variable | Use |
|---|---|
| %DOSL7.captcha.image% | Displays the CAPTCHA image in data URI format. |
| %DOSL7.captcha.change% | Displays the change CAPTCHA challenge icon. |
| %DOSL7.captcha.solution% | Displays the solution text box. |
| %DOSL7.captcha.submit% | Displays the Submit button. |
Example of Custom CAPTCHA:
| This question is for testing whether you are a human visitor and to prevent automated spam submission. <br> %DOSL7.captcha.image% %DOSL7.captcha.change% <br> <b>What code is in the image?</b> %DOSL7.captcha.solution% <br> %DOSL7.captcha.submit% |
Related Content
- How to Configure New L7 DDoS Profiles
- How to Edit / Manage L7 DDoS Profiles
- How to Add L7 DDoS Profile to Proxy