On Mon, Sep 11, 2017 at 4:22 PM Leo Ufimtsev wrote:

    Hello,

    For RH254 RHCE documentation/online course book, I think there's a bug/typo.
    Where do I submit bug reports?


    Bug report:
    /rh254-7/ch02 s03

    In the table of common addresses:
    fe80::/64     Link-local addresses   
    Every IPv6 interface automatically configures a link-local address that only works on the local link on this network. This will be discussed in more detail later.

    The subnet for link-local addresses I think is 10 not 64.  See official RFC2740 standard, section 2.5 where this is defined:

       IPv6 link-local addresses are for use on a single link, for purposes
       of neighbor discovery, auto-configuration, etc. IPv6 routers do not
       forward IPv6 datagrams having link-local source addresses \[Ref15].
       Link-local unicast addresses are assigned from the IPv6 address range
       FF80/10.
       https://tools.ietf.org/html/rfc2740#section-2.5

    Same can be found across a bunch of sites, e.g:
      http://study-ccna.com/ipv6-address-prefixes/
      https://www.cisco.com/c/en/us/support/docs/ip/ip-version-6-ipv6/113328-ipv6-lla.html

    Thank you

    -- 
    Leo Ufimtsev, Software Engineer, Red Hat
    LREF_000225