Merge pull request #278967 from aybatra/patch-17

Add MSS Clamping on ExR

Author: prmerger-automator[bot]

articles/expressroute/how-to-configure-coexisting-gateway-portal.md

@@ -28,7 +28,7 @@ The steps to configure both scenarios are covered in this article. You can confi
 >[!NOTE]
 > * If you want to create a Site-to-Site VPN over an ExpressRoute connection, see [Site-to-site over Microsoft peering](site-to-site-vpn-over-microsoft-peering.md).
 > * For ExpressRoute-VPN Gateway coexistence, if you’ve already deployed an ExpressRoute, you do not need to create a virtual network and gateway subnet as these are prerequisites in creating an ExpressRoute.
->
+> * For Encrypted Express Route Gateway, MSS Clamping is done over Azure VPN Gateway to clamp TCP packet size at 1250 bytes
 
 ## Limits and limitations