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diff --git a/GPL/traffic_profiles/trex/trex-stl-ethip6-ip6src253.py b/GPL/traffic_profiles/trex/trex-stl-ethip6-ip6src253.py
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+++ b/GPL/traffic_profiles/trex/trex-stl-ethip6-ip6src253.py
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+# Copyright (c) 2023 Cisco and/or its affiliates.
+#
+# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+#
+# Licensed under the Apache License 2.0 or
+# GNU General Public License v2.0 or later;  you may not use this file
+# except in compliance with one of these Licenses. You
+# may obtain a copy of the Licenses at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#     https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
+#
+# Note: If this file is linked with Scapy, which is GPLv2+, your use of it
+# must be under GPLv2+.  If at any point in the future it is no longer linked
+# with Scapy (or other GPLv2+ licensed software), you are free to choose
+# Apache 2.
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Stream profile for T-rex traffic generator.
+
+Stream profile:
+ - Two streams sent in directions 0 --> 1 and 1 --> 0 at the same time.
+ - Packet: ETH / IPv6 /
+ - Direction 0 --> 1:
+   - Source IP address range:      2001:1::2 - 2001:1::FE
+   - Destination IP address range: 2001:2::2
+ - Direction 1 --> 0:
+   - Source IP address range:      2001:2::2 - 2001:2::FE
+   - Destination IP address range: 2001:1::2
+"""
+
+from trex.stl.api import *
+from profile_trex_stateless_base_class import TrafficStreamsBaseClass
+
+
+class TrafficStreams(TrafficStreamsBaseClass):
+    """Stream profile."""
+
+    def __init__(self):
+        """Initialization and setting of streams' parameters."""
+
+        super(TrafficStreamsBaseClass, self).__init__()
+
+        # IPs used in packet headers.
+        self.p1_src_start_ip = u"2001:1::2"
+        self.p1_src_end_ip = u"2001:1::FE"
+        self.p1_dst_start_ip = u"2001:2::2"
+
+        self.p2_src_start_ip = u"2001:2::2"
+        self.p2_src_end_ip = u"2001:2::FE"
+        self.p2_dst_start_ip = u"2001:1::2"
+
+    def define_packets(self):
+        """Defines the packets to be sent from the traffic generator.
+
+        Packet definition: | ETH | IPv6 |
+
+        :returns: Packets to be sent from the traffic generator.
+        :rtype: tuple
+        """
+
+        base_p1, count_p1 = self._get_start_end_ipv6(
+            self.p1_src_start_ip,
+            self.p1_src_end_ip
+        )
+        base_p2, count_p2 = self._get_start_end_ipv6(
+            self.p2_src_start_ip,
+            self.p2_src_end_ip
+        )
+
+        # Direction 0 --> 1
+        base_pkt_a = (
+            Ether() /
+            IPv6(
+                src=self.p1_src_start_ip,
+                dst=self.p1_dst_start_ip
+            )
+        )
+          # Direction 1 --> 0
+        base_pkt_b = (
+            Ether() /
+            IPv6(
+                src=self.p2_src_start_ip,
+                dst=self.p2_dst_start_ip
+            )
+        )
+
+        # Direction 0 --> 1
+        vm1 = STLScVmRaw(
+            [
+                STLVmFlowVar(
+                    name=u"ipv6_src",
+                    min_value=base_p1,
+                    max_value=base_p1 + count_p1,
+                    size=8,
+                    op=u"inc"
+                ),
+                STLVmWrFlowVar(
+                    fv_name=u"ipv6_src",
+                    pkt_offset=u"IPv6.src",
+                    offset_fixup=8
+              )
+            ]
+        )
+        # Direction 1 --> 0
+        vm2 = STLScVmRaw(
+            [
+                STLVmFlowVar(
+                    name=u"ipv6_src",
+                    min_value=base_p2,
+                    max_value=base_p2 + count_p2,
+                    size=8,
+                    op=u"inc"
+                ),
+                STLVmWrFlowVar(
+                    fv_name=u"ipv6_src",
+                    pkt_offset=u"IPv6.src",
+                    offset_fixup=8
+                )
+            ]
+        )
+
+        return base_pkt_a, base_pkt_b, vm1, vm2
+
+
+def register():
+    """Register this traffic profile to T-rex.
+
+    Do not change this function.
+
+    :return: Traffic streams.
+    :rtype: Object
+    """
+    return TrafficStreams()