I will update this table in the future when there’s a release of new important OS whenever I get the time. Here are the default TTL values of different devices / Operating Systems : So, from this we can understand the OS of the remote system. Since this website is hosted on a Red Hat system, it returned 57 which is close to 64 (TTL default value of Linux system). You can get the TTL value by pinging an address. So, you can determine the OS based on the TTL value. Enter the routers WAN IP or domain name in Server name or address, select VPN type as L2TP/IPsec with pre-shared key, and enter the Pre-shared key we set in router IPsec General Setup. TTL values are different for different Operating Systems. TTL (Time To Live) is a timer value included in packets sent over networks that tells the recipient how long to hold or use the packet before discarding and expiring the data (packet).
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