Add --address_type to interop and xds test descriptions (#36830)
This documents the changes the the test server classes in https://github.com/grpc/grpc-java/pull/11231
Closes #36830
COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36830 from larry-safran:dualstack_test_doc 986e9dd3fa4e90eb1a0bc550a0aadc886e5d327b
PiperOrigin-RevId: 647054757
diff --git a/doc/interop-test-descriptions.md b/doc/interop-test-descriptions.md
index fd3a195..2ae7ffb 100755
--- a/doc/interop-test-descriptions.md
+++ b/doc/interop-test-descriptions.md
@@ -1287,6 +1287,12 @@
* Whether to use a plaintext or encrypted connection
+Servers that want to be used for dual stack testing must accept this argument:
+
+* --address_type=IPV4|IPV6|IPV4_IPV6
+
+ * What type of addresses to listen on. Default IPV4_IPV6
+
Servers must support TLS with ALPN. They should use
[server1.pem](https://github.com/grpc/grpc/blob/master/src/core/tsi/test_creds/server1.pem)
for their certificate.
diff --git a/doc/xds-test-descriptions.md b/doc/xds-test-descriptions.md
index 8bd482a..be2b3ff 100644
--- a/doc/xds-test-descriptions.md
+++ b/doc/xds-test-descriptions.md
@@ -17,6 +17,12 @@
* When set to true it uses XdsServerCredentials with the test server for security test cases.
In case of secure mode, port and maintenance_port should be different.
+Servers that want to support dual stack testing (like Java) should also accept:
+
+* --address_type=IPV4|IPV6|IPV4_IPV6
+ * Type of IP address to bind to. IPV4_IPV6 will use the wildcard address.
+ IPV4 and IPV6 will cause server to bind to one non-localhost and the localhost address of the appropriate type
+
In addition, when handling requests, if the initial request metadata contains the `rpc-behavior` key, it should modify its handling of the request as follows:
- If the value matches `sleep-<int>`, the server should wait the specified number of seconds before resuming behavior matching and RPC processing.
