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17.1 Legacy Series / Re: Fragmented UPD not send over IPSEC tunnel
« on: June 28, 2017, 12:40:39 pm »
Have you modified the MTU on the Fortigate policy?
you can modify it per policy:
config firewall policy
edit xxx
set tcp-mss-sender 1436
You'll need to calculate the MSS and edit the 1436 number depending on what you're connected by on the interface the Fortigate is using for the IPSec tunnel.
you can modify it per policy:
config firewall policy
edit xxx
set tcp-mss-sender 1436
You'll need to calculate the MSS and edit the 1436 number depending on what you're connected by on the interface the Fortigate is using for the IPSec tunnel.