With advent of smartphones and intelligent house hold devices connecting to internet, the address space problem is going to blow up soon. IPv6 is soon to find its place in large extent in ADCs. In one of my articles, I have written the cons of DNS GSLB. It described how client proximity feature can help a client to reach nearest site. I was wondering if we can solve our GSLB problems with IPv6.
IPv6 provides anycast address. For quick reference, I pasted here few text.
An identifier for a set of interfaces (typically
belonging to different nodes). A packet sent to an
anycast address is delivered to one of the interfaces
identified by that address (the "nearest" one,
according to the routing protocol's measure of
distance).
As the above text explains router can find nearest host that listens on the anycast address. This can be used as advantage in GSLB. All the sites can have anycast address as a virtual IP. When the domain name resolves to this anycast address, V6 router can find a nearest site for the client.
Implementation must note the cases with site failover in which case the router will chose a different site and the existing connection will break. In order to maintain site stickiness I would leave to the implementation. One way is to redirect the client to an unicast address as soon a site is selected.
In summary, IPv6 brought in advantage with anycast address in GSLB. Soon, we will see this implementation in ADCs.
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