Errata

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 at
the last minute. This isn’t from E1M7. It should just read “An image
from the original Quake game).
p48, Equation 2.2, lin 2. The sum on the right should be over “other (elementof) Neighbors(boid)”.
p55, pa2, “so each of the clients” should be “so one of the clients”.
p73, pa2, “at each layer transformed” should be “at each layer the data is transformed.
p75, pa2, some of the text refers to a different frame than the one highlighted in Figure 3.3. It should be “Frame 3530 had 651 bytes on the wire”. Then this corresponds to “609 bytes of application sent data”.
p117, pa3, “244.0.0.0” should be “224.0.0.0”.
p210, pa6, “Table 6.1” should be “Table 6.2”.
p268, pa2, “going to move”, should be “going to be able to move”.
p272, pa2, “DIVE” should be “DIV”.
p291, pa2, “external” should be “external inputs”.
p329, pa3, “50ms or lower” should be “50ms or higher”.
p369, Figure 11.12 has some boxes incorrectly labelled. The top right box should say “Move P0 to P1”. The second box on the right is correct. The third box on the right should say “Fail Move P2 to Q1”.
p403, reference to 13.2.2 should say 13.3.2.
p470, figure 13.7. Three ellipses at the top of the figure should be GatewayA, PhysicsA and GameplayA.

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” better as “in some systems”.
p37, pa1, “see one’s one” should be “see one’s own”.
p37, pa1, “in the avatar represents” should be “is the avatar that represents”.
p48, pa3, “programming language” should be “programming languages”.
p52, pa2, “to NVE” should be “to an NVE”.
p54, pa4, “standalone” should be “standalone code”.
p60, pa2, “The creation and initialization Java code for” should be “The Java code for creation and initialization of”.
p63, pa6, “Normally with” strike “Normally”.
p71, pa1, “how Internet” should be “how the Internet”.
p75, “3.404564” should be “3.404264”.
p76, pa5, “syntax protocols” should be “syntax of the protocols”.
p76, pa5, Note tha the binary protocol is discussed in Chapter 13.
p79, pa1, “BZFlag Games” should be “BZFlag game”
p81, pa2, “no-one” shouldn’t have a hyphen.
p82, pa5, in the code the lines starting “The telnet program …”, and “We then type”, shouldn’t be in the system font.
p107, pa1 “30×6” should be written with a times symbol, not an x.
p107, pa2, “repeated any” should be “repeated in any”.
p142, pa6, “transition” should be “transition line”.
p187, pa4, “peer” should be “process”.
p188, pa3, “action system” should just be “system”.
p189, pa5, “nominate” should be “nominated”.
p191, pa3, “monster” should be plural.
p197, pa5, “sockdf” should be “sockfd”.
p218, pa3, “and be”, should be “and can be”.
p219, pa2, “those industries” should be “that industry”.
p224, pa2, “TX3D”, should be “X3D”.
p225, pa3, “certain time”, should be “specified time”.
p233, pa3, “limiting the”, should be “limiting of the”.
p243, pa1, “should exactly”, strike “exactly”.
p266, pa2, strike “or more”.
p271, pa1, the references to OpenSG and Schaeffer, should just in the list in the previous sentence.
p272, pa1, question mark at the end.
p289, pa2, “. Or” should be “. Alternatively,”.
p301, pa1, “model-based” strike “-based”.
p304, pa2, “architecture” should be plural.
p305, pa2, “object’s” should just be “object”.
p325, pa4, “If sender”, should be “If the sender”. Also in this sentence “and, and” should just be “and”.
p326, pa4, “in not unusual” should be “is not unusual”.
p326, pa4, “simulations latencies” should be “simulation latencies”.
p328, pa1, “randolm” should be “random”.
p329, pa1, should be “1.1 seconds”.
p334, pa2, “is has” should be “has”.
p341, pa6, add “respectively” after “NatA and NatB”.
p381, pa2 “to the name” should be “by the name”.
p404, pa1, “second” should be “secondary”.
p412, pa3, should of course say “choose the top eight”.
p428, pa2, “Proxies are used to”, replace “to” by “so”.
p429, pa1, “partitioning” should be plural.
p461, pa4, “backs” should be “hacks”.
p463, pa6, “virtual private network” should be in italics first time.
p466, pa3, “eventually” should be “, eventually, “.
p466, pa5 “is can” should be “can”.
p474, pa2, replace “are sending” with “might be sending”.

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 initial packet. The log from Wireshark thus uses large numbers; but these are not because a large amount of data has been sent.