Monthly Archives: October 2014

WAP, NVGRE and Hair pinning

Hello All ,

Today we faces connectivity issue between tenant networks behind same NVGRE GW.

Think that you have two tenants , Company A and Company B and two virtual networks and also NAT rule configured for remote access 3389 (RDP) to Company A VM can connect Company B VM but problem is two virtual networks are behind the same NVGRE GW.

Problem is single interface and To and From is behind a single interface , means source vm network coming from NVGRE outside interface and want to get in same interface to access other vm network .

This image could explain , BRIDGE is describing NVGRE , squares are vm networks and VM s behind


Pls check related settings on NVGRE GW node , active or passive , i guess its not important


PS C:\Users\Administrator.DORUKCOSN> Get-NetNatGlobal
InterRoutingDomainHairpinningMode : External


Then set it Local

PS C:\Users\Administrator.DORUKCOSN> Set-NetNatGlobal -InterRoutingDomainHairpinningMode Local
PS C:\Users\Administrator.DORUKCOSN>

Then go go go , try it now

External comes default , be care about it