Do Azure VPN have TTL configuration.

Hi @Ibrahim Shaikh,

Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.

We Understand that you wanted to know whether Azure Virtual Network Gateway has a TTL configuration.

Unfortunately, the answer is No.

The TTL mechanism is commonly associated with DNS records in Azure virtual networks rather than the Azure Virtual Network Gateway. DNS records does contain TTL mechanism, which allows the cache to store the record for a specified duration ensuring the record to be up to date. This feature is relevant for name resolution in Azure, allowing resources within virtual networks to communicate efficiently.

For your reference: https://video2.skills-academy.com/en-us/azure/virtual-network/virtual-networks-name-resolution-for-vms-and-role-instances?tabs=redhat#:~:text=DNS%20records%20contain%20a%20time%2Dto%2Dlive%20(TTL)%20mechanism%2C%20which%20allows%20the%20cache%20to%20store%20the%20record%20for%20as%20long%20as%20possible%20without%20impacting%20record%20freshness.%20Thus%2C%20client%2Dside%20caching%20is%20suitable%20for%20most%20situations.

Kindly let us know if the above helps or you need further assistance on this issue.

Thanks,

Sai Prasanna.

Azure Virtual Network Gateway does not have a direct configuration for Time-To-Live (TTL) values. However, TTL values can be controlled indirectly by managing routing and user-defined routes (UDRs). These routes can be applied to the gateway subnet, but with some caveats. For example, certain configurations might impact traffic flows, especially between VPN and ExpressRoute gateways, or private endpoints within the same VNet. Any packet routing between gateways follows the UDR rules applied to the subnet, which may result in TTL adjustments as part of the broader network behavior​.

If you're interested in controlling traffic behavior, you might need to explore options like routing configurations, active-active gateway setups, and gateway subnet sizing. However, specific TTL manipulation is not typically a part of the virtual network gateway's feature set​ Cloudtrooper.

For more detailed configuration options and to explore related settings, you can check out the official documentation https://azure.microsoft.com/en-us/products/vpn-gateway/