diff --git a/testing/nettest/CMakeLists.txt b/testing/nettest/CMakeLists.txt
index 94fa4557f48..6bbf9575370 100644
--- a/testing/nettest/CMakeLists.txt
+++ b/testing/nettest/CMakeLists.txt
@@ -77,7 +77,8 @@ if(CONFIG_TESTING_NET_TEST)
     set(SRCS
         ${CMAKE_CURRENT_LIST_DIR}/others/test_others.c
         ${CMAKE_CURRENT_LIST_DIR}/others/test_others_common.c
-        ${CMAKE_CURRENT_LIST_DIR}/others/test_others_bufpool.c)
+        ${CMAKE_CURRENT_LIST_DIR}/others/test_others_bufpool.c
+        ${CMAKE_CURRENT_LIST_DIR}/others/test_others_chksum.c)
 
     nuttx_add_application(
       NAME
diff --git a/testing/nettest/Makefile b/testing/nettest/Makefile
index 6f10c39106a..3e5f4f22a8b 100644
--- a/testing/nettest/Makefile
+++ b/testing/nettest/Makefile
@@ -54,7 +54,8 @@ endif
 ifeq ($(CONFIG_TESTING_NET_OTHERS),y)
 MAINSRC  += others/test_others.c
 PROGNAME += cmocka_net_others
-CSRCS    += others/test_others_common.c others/test_others_bufpool.c
+CSRCS    += others/test_others_common.c others/test_others_bufpool.c \
+            others/test_others_chksum.c
 endif
 
 endif
diff --git a/testing/nettest/others/test_others.c b/testing/nettest/others/test_others.c
index b883840d237..994f1eaf90c 100644
--- a/testing/nettest/others/test_others.c
+++ b/testing/nettest/others/test_others.c
@@ -39,6 +39,7 @@ int main(int argc, FAR char *argv[])
   const struct CMUnitTest others_tests[] =
     {
       cmocka_unit_test(test_others_bufpool),
+      cmocka_unit_test(test_others_chksum),
     };
 
   return cmocka_run_group_tests(others_tests, test_others_group_setup,
diff --git a/testing/nettest/others/test_others.h b/testing/nettest/others/test_others.h
index f59024e84eb..621be46a7a3 100644
--- a/testing/nettest/others/test_others.h
+++ b/testing/nettest/others/test_others.h
@@ -48,5 +48,6 @@ int test_others_group_teardown(FAR void **state);
  ****************************************************************************/
 
 void test_others_bufpool(FAR void **state);
+void test_others_chksum(FAR void **state);
 
 #endif /* __APPS_TESTING_NETTEST_OTHERS_TEST_OTHERS_H */
diff --git a/testing/nettest/others/test_others_chksum.c b/testing/nettest/others/test_others_chksum.c
new file mode 100644
index 00000000000..74ebeb9b89b
--- /dev/null
+++ b/testing/nettest/others/test_others_chksum.c
@@ -0,0 +1,63 @@
+/****************************************************************************
+ * apps/testing/nettest/others/test_others_chksum.c
+ ****************************************************************************/
+
+#include <setjmp.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <cmocka.h>
+
+#include <nuttx/mm/iob.h>
+#include <nuttx/net/netdev.h>
+
+#include "test_others.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+void test_others_chksum(FAR void **state)
+{
+  struct iob_s iob1;
+  struct iob_s iob2;
+  struct iob_s iob3;
+
+  uint8_t data1[] = {0xaa, 0xbb, 0xcc};
+  uint8_t data2[] = {0xdd, 0xee};
+  uint8_t data[] = {0xaa, 0xbb, 0xcc, 0xdd, 0xee};
+
+  uint16_t chained_sum;
+  uint16_t reference_sum;
+
+  memset(&iob1, 0, sizeof(iob1));
+  memset(&iob2, 0, sizeof(iob2));
+  memset(&iob3, 0, sizeof(iob3));
+
+  /* First IOB: odd number of bytes */
+
+  memcpy(iob1.io_data, data1, sizeof(data1));
+  iob1.io_len = sizeof(data1);
+  iob1.io_offset = 0;
+  iob1.io_flink = &iob2;
+
+  /* Second IOB: zero-length */
+
+  iob2.io_data[0] = 0xdd;
+  iob2.io_len = 0;
+  iob2.io_offset = 0;
+  iob2.io_flink = &iob3;
+
+  /* Third IOB: remaining bytes */
+
+  memcpy(iob3.io_data, data2, sizeof(data2));
+  iob3.io_len = sizeof(data2);
+  iob3.io_offset = 0;
+  iob3.io_flink = NULL;
+
+  chained_sum = chksum_iob(0, &iob1, 0);
+  reference_sum = chksum(0, data, sizeof(data));
+
+  assert_int_equal(chained_sum, reference_sum);
+}