F5 to read a combined CRL file

awan_m  hello i   was able to find some information to help guide you to a resolution. 

While there may not be a specific article that addresses the exact scenario of merging multiple CRL files into a single file for use with F5 BIG-IP, there are general resources and documentation that can help you understand and manage CRLs on F5 systems. Here are some useful resources:

1. **F5 Networks Official Documentation:**
   - [Managing SSL Certificates and Keys](https://techdocs.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/bigip-ssl-administration-13-1-0.html): This guide covers various aspects of managing SSL certificates and CRLs on BIG-IP systems.
   - [K13309: Overview of the BIG-IP system’s support for certificate revocation lists (CRLs)](https://support.f5.com/csp/article/K13309): This article provides an overview of how the BIG-IP system supports CRLs.

2. **OpenSSL Documentation:**
   - [OpenSSL Manual](https://www.openssl.org/docs/man1.1.1/man1/openssl.html): The OpenSSL documentation can provide you with detailed information on how to use OpenSSL commands to manage CRLs.

3. **General Tutorials and Blogs:**
   - Look for general network engineering blogs and tutorials that cover SSL/TLS and CRL management. These resources can often provide step-by-step guides and practical examples.

If you need a specific step-by-step guide, here is a general approach to merging CRLs using OpenSSL, which can then be applied to F5:

1. **Combine the CRLs:**
   - Concatenate the two CRL files into one file:
     ```bash
     cat crl1.pem crl2.pem > combined_crl.pem
     ```

2. **Convert to DER format and back to PEM:**
   - Convert the combined CRL to DER format:
     ```bash
     openssl crl -in combined_crl.pem -inform PEM -out combined_crl.der -outform DER
     ```
   - Convert back to PEM format:
     ```bash
     openssl crl -in combined_crl.der -inform DER -out merged_crl.pem -outform PEM
     ```

3. **Upload and configure the F5 BIG-IP:**
   - Upload the `merged_crl.pem` file to your F5 BIG-IP system.
   - Update the client SSL profile to use the new CRL file.

By following these steps, you can merge multiple CRL files and ensure that the F5 BIG-IP system can read and process the combined CRL correctly.

 

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