IPv6 version of TCP programs (#32)

* IPv6 version of TCP programs --------- Co-authored-by: Stephane Bortzmeyer <[email protected]>
zigcc · Jan 4, 2024 · a699cc9 · a699cc9
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diff --git a/book-src/04-01-tcp-server.md b/book-src/04-01-tcp-server.md
@@ -14,4 +14,12 @@ When start starts up, try test like this:
 echo "hello zig" | nc localhost <port>
 ```
 
+By default, the program listens with IPv4. If you want IPv6, use `::1`
+instead of `127.0.0.1`, replace `net.Ip4Address.parse` by
+`net.Ip6Address.parse` and the field `.in` in the creation of the
+`net.Address` with `.in6`.
+
+(And connect to something like `ip6-localhost`, depending on the way
+your machine is set up.)
+
 The next section will show how to connect this server using Zig code.
diff --git a/book-src/04-02-tcp-client.md b/book-src/04-02-tcp-client.md
@@ -6,3 +6,8 @@ You can run it using `zig build run-04-02 -- <port>`.
 ```zig
 {{#include ../src/04-02.zig }}
 ```
+
+By default, the program connects with IPv4. If you want IPv6, use
+`::1` instead of `127.0.0.1`, replace `net.Address.parseIp4` by
+`net.Address.parseIp6`.
+