https://community.cisco.com/t5/network-security/changing-mtu-on-outside-interface/m-p/2566648#M201932 <P>I found the answer..... for others.... Yes it will tear down the tunnel and re-create.</P><P>&nbsp;</P><P>&nbsp;</P> Tue, 23 Dec 2014 13:17:05 GMT burleyman 2014-12-23T13:17:05Z https://community.cisco.com/t5/network-security/changing-mtu-on-outside-interface/m-p/2566647#M201931 <P>I have changed the MTU settings on the outside Interface before but I have not when there are site-2-site VPN's connected. If I change this will the site come down or be affected?</P><P>&nbsp;</P><P>&nbsp;</P><P>MIke<BR />&nbsp;</P> Tue, 12 Mar 2019 05:15:30 GMT https://community.cisco.com/t5/network-security/changing-mtu-on-outside-interface/m-p/2566647#M201931 burleyman 2019-03-12T05:15:30Z https://community.cisco.com/t5/network-security/changing-mtu-on-outside-interface/m-p/2566648#M201932 <P>I found the answer..... for others.... Yes it will tear down the tunnel and re-create.</P><P>&nbsp;</P><P>&nbsp;</P> Tue, 23 Dec 2014 13:17:05 GMT https://community.cisco.com/t5/network-security/changing-mtu-on-outside-interface/m-p/2566648#M201932 burleyman 2014-12-23T13:17:05Z