I have a Fortigate201E. I setup port 15 to have IPSEC tunnel to another Huawei FW, with a fiber link. The IPSEC tunnel is setup correctly and both phase 1 and 2 is up
I want to connect a wireshark and monitor the link for any drop packet or error. How do I do that?
Thanks for any help.
The reason why I want to monitor the link, is because someone told me the current MTU size of 1500 might be reduced with IPSEC tunnel overhead? not sure if this is true.
By default the MTU of an IPsec VPN Interface is dynamically calculated, this is to accommodate the additional overhead added by IPSec encryption. Below articles explains the details.
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So does it means I do not have to manually set MTU on that IPSEC tunnel interface?
Thanks for advice.
That is correct. Unless you are facing some issues with traffic and the corresponding troubleshooting points fragmentation issues, you may leave the settings/values as it is.
I have not confirmed if there's any fragmentation on the wireshark. Still in the process of confirming. Will reply once I got any update. Thanks for your advice.
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