# Using IPSEC transport mode **URL:** \ **Category:** Security\ **Created:** [January 11, 2016, 5:40am UTC](https://forum.networklessons.com/t/using-ipsec-transport-mode/572 "2016-01-11T05:40:29Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![drbk563](https://cdn-forum.networklessons.com/letter_avatar_proxy/v4/letter/d/34f0e0/32.png) [@drbk563](https://forum.networklessons.com/u/drbk563)\ **Post date:** [January 11, 2016, 5:40am UTC](https://forum.networklessons.com/t/using-ipsec-transport-mode/572/1 "2016-01-11T05:40:29Z")
Hi, Why can’t I use transport mode when setting up site to site vpns? I tried setting up a site to site vpn and using transport mode and I noticed it didn’t change phase 2 still showed tunnel mode. Thank you ---
**Author:** ![ReneMolenaar](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/renemolenaar/32/488_2.png) [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)\ **Post date:** [January 11, 2016, 11:11am UTC](https://forum.networklessons.com/t/using-ipsec-transport-mode/572/2 "2016-01-11T11:11:17Z")
Hi Victor, When you use transport mode you can only protect traffic from directly connected interfaces, otherwise the router will automatically switch back to tunnel mode. Rene ---
**Author:** ![ReneMolenaar](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/renemolenaar/32/488_2.png) [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)\ **Post date:** [January 17, 2018, 8:06am UTC](https://forum.networklessons.com/t/using-ipsec-transport-mode/572/3 "2018-01-17T08:06:12Z")
2 posts were merged into an existing topic: [Cisco IPsec Tunnel Mode Configuration](https://forum.networklessons.com/t/cisco-ipsec-tunnel-mode-configuration/1076)