Berkeley CSUA MOTD:Entry 54371
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2017/12/16 [General] UID:1000 Activity:popular
12/16   

2012/4/26-6/4 [Computer/Networking] UID:54371 Activity:nil
4/26    I see that soda has an ipv6 address but ipv6 traffic from this box
        doesn't actually work (ping6 <DEAD>ipv6.google.com<DEAD>, ping6 http://www.v6.facebook.com
        Is this expected to work?
        \_ Soda doesn't have a real IPv6 address.  The IPv6 addresses you see
           in ifconfig are just link-local addresses; any IPv6-capable machine
           will autogenerate these, whether or not it's connected to an IPv6
           will autogenerate those, whether or not it's connected to an IPv6
           router.  They're useful when you do things like connect two machines
           directly with an ethernet cable: they'll both assign themselves
           addresses and it just works.  You need a real address to talk to the
           directly with an ethernet cable: each machine will assign itself an
           address and it just works.  You need a real address to talk to the
           internet, though.  http://en.wikipedia.org/wiki/Link-local_address
2017/12/16 [General] UID:1000 Activity:popular
12/16   

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Cache (1480 bytes)
en.wikipedia.org/wiki/Link-local_address
link) or a point-to-point connection that a host is connected to. Routers do not forward packets with link-local addresses. Link-local addresses may be assigned manually by an administrator or by operating system procedures. Most often they are assigned using stateless address autoconfiguration. such as configuring link-local addresses as well as globally routable addresses on the same host. Therefore, hosts search for a DHCP server on the network, before assigning link-local addresses. Address Resolution Protocol (ARP) probes to ascertain that the address is not in use on the network. If a reply is received to the ARP, it indicates the candidate IP address is already in use; a new random candidate IP address is then created and the process repeated. The process ends when there is no reply to the ARP, indicating the candidate IP address is available. Link-local IPv6 address assignment automatically implies the on-link presence for this routing prefix, unlike for the addresses of other scopes. IPv6 introduced additional means of assigning addresses to host interfaces. Through NDP routing prefix advertisements, a router or a dedicated server host may announce configuration information to all link-attached interfaces which causes additional IP address assignment on the receiving interfaces for local or global routing purposes. This process is sometimes also considered stateless, as the prefix server does not receive or log any individual assignments to hosts.