Application Delivery (ADX)

Application Grouping and Real Server Persistence - Sundry

by pmorrissey on ‎05-22-2009 06:30 AM - edited on ‎10-30-2013 05:43 PM by bcm1 (566 Views)

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Application Grouping and Real Server Persistence


Unlimited VIPs


If your real Web servers have many IP addresses, you can easily create a separate VIP for each real IP address

without individually configuring each VIP. To do so, configure a host range. A host range is a block of contiguous

IP addresses.

To configure a host range, you add a VIP and specify how many hosts are in the range. The ServerIron ADX

automatically configures a separate VIP for each host in the range. When you bind the base VIP to the real

servers, the ServerIron ADX associates the VIP with the first real IP address on the server. Subsequent VIPs in

the host range are associated with subsequent real IP addresses on the server. The association is based on the

offset from the base VIP. When a client requests an address in the VIP range, the ServerIron ADX automatically

maps the VIP to a real IP address on a real server based on the address's offset from the base VIP address.

For example, if you define a range using the base VIP and a host range of 10, the ServerIron ADX

maps VIPs – to a range of ten addresses on each real server. If a client requests VIP (two from the base VIP number), the ServerIron ADX sends the request to an IP address that is two

higher than the start of the corresponding range on a real server.

You can configure up to 256 virtual servers, each with a host range of 256 addresses, for a total of up to 64,000


NOTE: To use this feature, the IP address range on the real server must be contiguous. If the range contains

gaps (addresses in use by other hosts), specify separate ranges on the virtual server to work around the gaps.


Sticky VIPs


The "track source-ip" command entered under a VIP acts like enabling stickiness for all protocols defined under

that VIP. This means that all requests from the same source-ip to all destination ports defined in the VIP will be

load balanced to the same real server.

NOTE: This is not a commonly used feature. You can also use "sticky" for each port you define under the VIP.