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Alternate Source Address needed on Virtual Service for back end connection

Updated: 

 

Information

 

Summary:

Virtual Service not working due to wrong back-end source IP
Environment:

Product: LoadMaster

Version: Any

Platform: Any

Application: Any
Question/Problem Description:

Unable to connect to any service because the server will only accept connections from a specific subnet/IP.
Steps to Reproduce:  
Error Message:  
Defect Number:  
Enhancement Number:  
Cause:  
Resolution:
  • Packet captures showed successful front end communication, but the back-end communication would fail after the initial SYN from the loadmaster over port 443, with a flood of Re-Transmissions.
  • Back-end azure environment/servers will only accept connections sourced from a specific subnet range/IP addresses.
  • To fix this, we need to enable the ability to specify an alternate source address.

  • This is located in System Configuration -> Miscellaneous Options -> L7 Configuration -> Allow connection scaling over 64K Connections.

  • Next, you will have to navigate to the Virtual Service that you want to change the Source IP Address of. Navigate to advanced properties -> Alternate Source Addresses and type in the new Source IP Address. You will not need to add the CIDR here.

  • Connections to the virtual service should now work.
Workaround:  
Notes:

https://support.kemptechnologies.com/hc/en-us/articles/360015826692-How-to-Configure-Subnet-Originating-Request-with-Non-Local-Real-Servers-
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