Remote Gateway IP:

The output shows10.200.5.1as the remote gateway IP, confirming that this is the IP address of the remote gateway involved in the IPsec VPN tunnel.

Quick Mode Selectors:

The quick mode selectors specify the subnets involved in the VPN. The output showssrc: 0:10.1.2.0/255.255.255.0:0anddst: 0:10.1.1.0/255.255.255.0:0, indicating the subnets being tunneled.

DPD (Dead Peer Detection):

DPD is shown asmode=on-demand on=1 idle=20000ms retry=3 count=0 seqno=0, indicating that DPD is enabled in on-demand mode.

Anti-replay:

The output includesreplaywin=2048andreplaywin_lastseq=00000000, which are indicators that anti-replay protection is enabled for the IPsec tunnel.

References

Fortinet Network Security 7.2 Support Engineer Documentation

VPN Configuration and Diagnostic Guides

Kernel Slabs Overview:

The slab allocator in the Linux kernel is used for efficient memory management. It groups objects of the same type into caches, which are divided into slabs.

Each slab contains multiple objects and helps to minimize fragmentation and enhance memory allocation efficiency.

Interpreting the Exhibit:

The exhibit shows output related to various kernel slab caches.

The line forip6_sessionindicates that there are 1300 kB allocated for this slab, which means the total memory size allocated for IPv6 session objects in the kernel is 1300 kB.

References:

Fortinet Community: Explanation of kernel slab allocation and usage​(Welcome to the Fortinet Community!)​​(Hammertux)​.

Linux Kernel Documentation: Slab Allocator details​(Hammertux)​.

RTT (Round Trip Time):

RTT in the context of the FortiGuard server list indicates the time it takes for a request to be sent to a FortiGuard server and for a response to be received.

This metric helps determine the latency between the FortiGate device and the FortiGuard servers, which is crucial for ensuring efficient and quick updates and responses for services like web filtering and antivirus updates.

Server Selection:

The FortiGate device uses RTT values to prioritize servers. Servers with lower RTT values are preferred as they respond faster, ensuring minimal delay in processing requests.

This improves the overall performance of FortiGuard services by reducing the time it takes to communicate with the servers.

References:

Fortinet Community: Troubleshooting FortiGuard server connections and RTT values​(Welcome to the Fortinet Community!)​​(Fortinet Docs)​.

Fortinet Documentation: FortiGuard server settings and RTT explanation​(Welcome to the Fortinet Community!)​​(Fortinet Docs)​.