This is not really an errata, but we forgot to say something important about random offsets for the sequence numbers and acknowledgement number. On page 92 the text describes these as starting from 0 or 1 and then increasing. However, to defeat certain types of packet injection attacks, a random offset is chosen for the …
Author archives: Anthony
Unimportant Corrections
p4, pa1, “software interact” should be “software interacts”.p7, “focussing on” strike “focussing”.p7, “first-class” should be “first class of”.p10, pa3, strike “there is connection”.p12, pa2 “increasing” should be “increasingly”.p13, pa1 “opennessed” should be “openness”p23, reference to (Figure 1.12) could be much earlier in this section.p28, pa3, “users looking” should be “user looking”.p30, pa1, “in some worlds” …
Important Corrections
p9, pa2, “caller to sender” should be “caller to receiver”.p14, pa2, “between services” should be “between servers”p26, The caption for Figure 1.15 is wrong as the image was changed atthe last minute. This isn’t from E1M7. It should just read “An imagefrom the original Quake game).p48, Equation 2.2, lin 2. The sum on the right …
RealXTend
We’ll have a lot more to say about SecondLife in upcoming articles on this site. However, just released are new versions of realXtend’s Naali viewer and Taiga server, which are Open Source implementations of the SecondLife server and client software. We discuss in the book that the client-server protocol for SecondLife was reverse engineered well before …
State of the Internet Q3 2009
The latest edition of Akamai’s State of the Internet, covering Q3 2009, is now available. We refer to an earlier report in the book. From their announcement (Jan 28th), this report includes: Average measured connection speeds of the top 10 fastest cities per continent/region The top 10 ports seeing nearly 95 percent of all observed attack …
Legality of Deep Packet Inspection
In the book we briefly touch on the issue of net neutrality; whether those running routers should be allowed to inspect the content of packets, rather than just the headers. This issue will rumble on for years, but the legality of so called deep-packet inspection, is being challenged in Europe. Virgin Media, which runs a big …
Mammoth Media
Mammoth Media have produced an interesting guide to dedicated server software for games. They argue that games developers can better serve their customers by releasing dedicated server software that customers, or 3rd parties can install. In particular, the guide suggests that allowing ISPs to provision dedicated servers can improve customer experience, and alleviate demand at the …