topic Re: VIP or Real Server? in Application Networking

VIP or Real Server?

e_kniazev1974 — Thu, 04 Oct 2007 11:06:36 GMT

Hi ALL!

1. Client send request to ACE to VIP

X.X.X.X

2. ACE forward this client request to

Real Server Y.Y.Y.Y

Q.: Which server established connection

with client VIP or Real Server?

Re: VIP or Real Server?

Gilles Dufour — Thu, 04 Oct 2007 11:18:19 GMT

the server will see the request coming from the client and will respond to the client.

You can enable client nat in ACE if you need the traffic to come from a specific address.

Gilles.

Re: VIP or Real Server?

e_kniazev1974 — Thu, 04 Oct 2007 11:31:56 GMT

Do you mean Real Server when write "the server"?

I ask you because there is opinion that client established connection with VIP and ACE established connection with Real Server.

I think that client established connection with Real Server after ACE balancing.

Re: VIP or Real Server?

Gilles Dufour — Thu, 04 Oct 2007 17:08:11 GMT

the client only communicates with the vip.

It is not aware of the real server.

The real server is not aware of the existence of the ACE module unless you do client nat.

So the real server will see connections comming from the client [but this is actually the ACE spoofing the client ip address].

Gilles.

Re: VIP or Real Server?

danger_mousie — Thu, 04 Oct 2007 18:06:39 GMT

Are there any circumstances where the real IP would be seen by the client?

Re: VIP or Real Server?

Gilles Dufour — Thu, 04 Oct 2007 18:09:54 GMT

if the server response bypasses the ACE module, the client may see the real server ip, but it will normally ignore it since it does not expect data from the real ip but the vip.

This is often the case with asymetric routing, when the real server gateway is not the ACE.

Gilles.