diff --git a/libkirk/ltp.py b/libkirk/ltp.py
index a4c85de..626e219 100644
--- a/libkirk/ltp.py
+++ b/libkirk/ltp.py
@@ -69,12 +69,52 @@ class LTPFramework(Framework):
         }
     )
 
-    # Environment variables without the `LTP_` prefix that are still forwarded.
+    # Environment variables without the `LTP_` or `TST_` prefix that are still forwarded.
     SUPPORTED_ENV: frozenset = frozenset(
         {
             "PATH",
             "KCONFIG_PATH",
             "KCONFIG_SKIP_CHECK",
+            # LTP network test variables
+            "RHOST",
+            "RUSER",
+            "PASSWD",
+            "IPV4_LHOST",
+            "IPV4_RHOST",
+            "IPV6_LHOST",
+            "IPV6_RHOST",
+            "LHOST_IFACES",
+            "RHOST_IFACES",
+            # Stress test parameters
+            "NS_DURATION",
+            "NS_TIMES",
+            "CONNECTION_TOTAL",
+            "IP_TOTAL",
+            "IP_TOTAL_FOR_TCPIP",
+            "ROUTE_TOTAL",
+            "ROUTE_CHANGE_IP",
+            "ROUTE_CHANGE_NETLINK",
+            "MTU_CHANGE_TIMES",
+            "IF_UPDOWN_TIMES",
+            "PING_MAX",
+            # ICMP / multicast
+            "NS_ICMPV4_SENDER_DATA_MAXSIZE",
+            "NS_ICMPV6_SENDER_DATA_MAXSIZE",
+            "MCASTNUM_NORMAL",
+            "MCASTNUM_HEAVY",
+            # File transfer / services
+            "DOWNLOAD_BIGFILESIZE",
+            "DOWNLOAD_REGFILESIZE",
+            "UPLOAD_BIGFILESIZE",
+            "UPLOAD_REGFILESIZE",
+            "HTTP_DOWNLOAD_DIR",
+            "FTP_DOWNLOAD_DIR",
+            "FTP_UPLOAD_DIR",
+            "FTP_UPLOAD_URLDIR",
+            # IPsec / virtual interfaces
+            "IPSEC_MODE",
+            "IPSEC_PROTO",
+            "VIRT_PERF_THRESHOLD",
         }
     )
 
@@ -126,7 +166,7 @@ def _update_env_vars(self, timeout: float) -> None:
             if key in self._PRESET_ENV:
                 continue
 
-            if key in self.SUPPORTED_ENV or key.startswith("LTP_"):
+            if key in self.SUPPORTED_ENV or key.startswith("LTP_") or key.startswith("TST_"):
                 self._env[key] = val
 
     async def _read_path(self, channel: ComChannel) -> Dict[str, str]:
diff --git a/libkirk/tests/test_ltp.py b/libkirk/tests/test_ltp.py
index 25d4468..9969810 100644
--- a/libkirk/tests/test_ltp.py
+++ b/libkirk/tests/test_ltp.py
@@ -134,6 +134,34 @@ async def test_find_suite(self, framework, sut, tmpdir):
             assert "TMPDIR" in test.env
             assert "LTP_COLORIZE_OUTPUT" in test.env
 
+    async def test_find_suite_network_vars(self, sut, monkeypatch):
+        """
+        Test that all SUPPORTED_ENV variables and TST_/LTP_ prefixed variables
+        are forwarded to tests.
+        """
+        # Build a mapping of every variable that should be forwarded:
+        # all entries in SUPPORTED_ENV (skipping PATH which is always present)
+        # plus representative TST_ and LTP_ prefixed variables.
+        net_vars = {
+            key: f"test_value_{key}"
+            for key in LTPFramework.SUPPORTED_ENV
+            if key != "PATH"
+        }
+        # One representative per prefix is enough to verify prefix-based forwarding.
+        net_vars["TST_USE_NETNS"] = "yes"
+        net_vars["LTP_RSH"] = "ssh -nq"
+
+        for key, val in net_vars.items():
+            monkeypatch.setenv(key, val)
+
+        framework = LTPFramework()
+        suite = await framework.find_suite(sut, "suite0")
+
+        for test in suite.tests:
+            for key, val in net_vars.items():
+                assert key in test.env, f"{key} not found in test env"
+                assert test.env[key] == val
+
     async def test_find_suite_max_runtime(self, sut):
         """
         Test find_suite method when max_runtime is defined.