Virtual IP response with real IP

[David Watts]

I have a VIP configured on an interface that has an IP in the same subnet, and when my client tries to connect to the VIP the packet being return has the address of the real IP of the interface and his firewall is thinking I'm trying to spoof it. Any clues... (most protocals are failing but telnet is bizarely OK)

[Christopher Caldwell]

How this works is application dependent. In order to work correctly the application has to use address specific information when setting up the bind procedure instead of using the IN_ADDR_ANY constant.

Most modern apps (web servers, newer versions of sendmail, etc.) will do this.

Oddly enough (based on your condition with telnet), most things spawned by inetd won't do this since inetd usually listens on every IP for a give service on a given port.