Errata

Understanding IPv6

Errata for Understanding IPv6

The errata list is a list of errors and their corrections that were found after the product was released.

The following errata were submitted by our customers and have not yet been approved or disproved by the author or editor. They solely represent the opinion of the customer.

Color Key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update

Version Location Description Submitted by Date submitted
Printed Page 70
First paragraph under Solicited-Node Address, 5th line

The text reads, "However, instead of using the local-link scope all-nodes multicast address ...". I believe the phrase "local-link" got inverted, and should instead read "However, instead of using the link-local scope all-nodes multicast address ...".

 Anonymous  Sep 30, 2012 
Printed Page 73
First line

Top of p73:
"As of RFC 4291, anycast addresses are used only as destination addresses and are assigned only to routers."

Completely wrong.

From RFC 4291:
Appendix B: Changes from RFC 3513

The following changes were made from RFC 3513, "IP Version 6
Addressing Architecture":

o The restrictions on using IPv6 anycast addresses were removed
because there is now sufficient experience with the use of anycast
addresses, the issues are not specific to IPv6, and the GROW
working group is working in this area.

In other words, those restrictions were in RFC 3513 (which obsoleted RFC 2373).

RFC 4291 lifts those restrictions!!!!

 Jonathan S. Weissman  Jun 06, 2013 
Printed Page 81
Last two lines on the page

The last two lines read, "The next nibble is for the usage type. There are 16 possible usage types. Contoso uses 4 usage types (backbone, edge, data center, and desktop) and reserves the other 15 for future use." Doing the math, shouldn't this read "... reserves the other 12 for future use." instead?

 Anonymous  Sep 30, 2012 
Printed Page 163
First paragraph

I'm struggling with "Network unreachability does not verify the end-to-end reachability of the destination." and "Network unreachability verifies only the reachability of the first hop to the destination." It's the using 'unreachability' to verify communication that's bothering me. Not sure what this should have been, and I'm assuming it would be a 'negative unreachable' result that is being referred... although I can't help feel I'm missing something.

 Anonymous  Jul 21, 2013 
PDF Page 196
Figure 7-5

Comparing the MLD and MLDv2 Multicast Listener Query, they seem to have the same structure for the first 24 bytes, and the Type/Code fields contain the same data. However, the MLDv2 structure then includes extra fields. How does the receiving host/router know which type of query this is, i.e. when it's reached the end of the message?

 johnckirk  Sep 23, 2012 
PDF Page 210
Figure 8-3

The top-right step of the flow-chart says:
"Do not initialize stat" (inside the box)
"eless address." (outside the box)

"stat" and "eless" should be combined into "stateless".
The box should be bigger to include all the text.

 johnckirk  Sep 24, 2012 
PDF Page 231
Penultimate paragraph

This paragraph says: "Additionally, an IPv6/IPv4 host typically has one or more tunnel interfaces that could have link-local, global, and unique local addresses assigned."

This is redundant, because the previous paragraph (before the bullet points) already says:
"typical IPv6 hosts can have multiple addresses assigned to [..] tunneling interfaces"

I recommend deleting the penultimate paragraph.

 johnckirk  Sep 25, 2012 
Printed Page 238
Last 2 lines

The last two lines contain invalid ISATAP addresses.

2001:db8:21a5:a499::5efe:157.60.17.211
fe80::5efe:157.60.17.211

As these are generated from a public IPv4 address they should be:

2001:db8:21a5:a499::200:5efe:157.60.17.211
fe80::200:5efe:157.60.17.211

Pg 239 also references the same addresses.

 scottduf  Jul 22, 2013 
PDF Page 258
Final paragraph

It currently says:
"The next-hop address is set to the destination address of 2001:db8:21d0:3f48:dd48:ab34:d07c:3914 (the destination)"

This doesn't match the address from the previous sentence, and "the destination" is repeated.

It should say:
"The next-hop address is set to the destination address of 2001:db8:21d0:3f48:2aa:ff:fe90:4d3c"

 johnckirk  Oct 03, 2012 
PDF Page 259
First paragraph

"The following iss the display"
should be:
"The following is the display"

 johnckirk  Oct 03, 2012