How to adjust MSS value for VPN tunnel on Zyxel USG FLEX H series devices?

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Zyxel_James
Zyxel_James Posts: 839 image  Zyxel Employee
Zyxel Certified Network Administrator - Security Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate 100 Answers

Question: How to adjust MSS value for VPN tunnel on Zyxel USG FLEX H series devices?

Answer:

  • For Policy-based VPN tunnels, direct adjustment of the MSS parameter is not supported.
  • For Route-based VPN tunnels (utilizing VTI interfaces), you can adjust the MTU value through the Web GUI instead of MSS. (Navigate to Network > Interface > Advanced Settings > VTI.)