We have a 2012Rs Server that is dual homed (2 network interfaces)
Lets say
NIC-A has IP address 192.168.1.1/24
NIC-B has IP address 192.168.2.1/24
Both interfaces connect to a the same router (CISCO) on different interfaces in the router
so the router has
INTERFACE Gi0/1 192.168.1.96/24
INTERFACE Gi0/2 192.168.2.96/24
We have an application running on the server that can only support 1 interface (it is configured to use NIC-B) and have need for workstations on 192.168.1.0/24 to access the application, but they must do it by connecting to 192.168.2.1.
This appears to not work (we have the application on a Server 2008R2 and it is working, but want to upgrade off 2008R2)
This seems to be a reverse path issue, and we had the same scenario when we upgraded our CENTOS servers from 5.x to 7.x.
The solution in CENTOS is edit /etc/sysctl.conf and change
set net.ipv4.conf.all.rp_filter = 0
Is there a way to do the same thing on a Windows Server 2012R2 and beyond?