ipv6 anycast: any practical usage example?
johnifanx98
Member Posts: 329
in CCNA & CCENT
I knew it's "one-to-nearest". But to be honest, I'm little bit lost when we will need this function. Does it have any peer function in IPv4?
Comments
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Ltat42a
Member Posts: 587 ■■■□□□□□□□
DHCP comes to mind. A new PC placed on a network is looking for a DHCP server to request an IP stack. -
johnifanx98
Member Posts: 329
Cool! This is a great example where anycast beats the broadcast.
Thanks, -
networker050184
Mod Posts: 11,962 Mod
The same thing can be used in IPv4, just assign the same IP in multiple places and let traffic route to the nearest one. I've seen this used for BGP next hops, DNS etc.An expert is a man who has made all the mistakes which can be made. -
m3zilla
Member Posts: 172
DHCP comes to mind. A new PC placed on a network is looking for a DHCP server to request an IP stack.
I'll be honest...I have no clue how DHCP works in IPv6, but in IPv4, a PC broadcast for a DHCP, it doesn't send a unicast. I assume in IPv6, it's going to send some sort of multicast, and not unicast, so I don't see how an anycast would work for DHCP. -
Trifidw
Member Posts: 281
DHCP requests are multicast on ff02::1:2. A better example of anycast would be to replace a FHRP such as HSRP or GLBP. I expect servers will be using this feature too to load balance.
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xXErebuS
Member Posts: 230
I've thought about this and I'm not sure about that one; going to the closest one isn't exactly load balancing... there would have to be some work done.
