diff --git a/examples/trex/external_encap_node/map.yaml b/examples/trex/external_encap_node/map.yaml
index 0e5bf8a..54ded20 100644
--- a/examples/trex/external_encap_node/map.yaml
+++ b/examples/trex/external_encap_node/map.yaml
@@ -65,13 +65,23 @@ items:
 - mapfile: /sys/fs/bpf/xdp/globals/n1_overlay_fib4
   overlay_fib4:
     items:
-    - key:
-        vrf_id: 1
-        addr: "10.0.1.11"
-      val:
-        flags: 0
-        segs:
-        - "fc00:1101::"
+    - {key: {vrf_id: 1, addr: "20.0.0.0"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.1"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.2"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.3"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.4"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.5"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.6"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.7"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.8"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.9"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.10"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.11"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.12"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.13"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.14"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.15"}, val: {flags: 0, segs: ["fc00:1101::"]}}
+    - {key: {vrf_id: 1, addr: "20.0.0.16"}, val: {flags: 0, segs: ["fc00:1101::"]}}
 - mapfile: /sys/fs/bpf/xdp/globals/n1_fib6
   fib6:
     items:
diff --git a/examples/trex/external_encap_node/new_connection_test.py b/examples/trex/external_encap_node/new_connection_test.py
index 6078dfb..24ae3bf 100644
--- a/examples/trex/external_encap_node/new_connection_test.py
+++ b/examples/trex/external_encap_node/new_connection_test.py
@@ -18,7 +18,7 @@ def create_profile(self, cps):
         prog_s.wait_for_peer_close()
 
         # ip generator
-        ip_gen_c = ASTFIPGenDist(ip_range=["20.0.0.0", "20.0.255.255"], distribution="seq")
+        ip_gen_c = ASTFIPGenDist(ip_range=["20.0.0.0", "20.0.0.16"], distribution="seq")
         ip_gen_s = ASTFIPGenDist(ip_range=["30.0.0.0", "30.0.255.255"], distribution="seq")
         ip_gen = ASTFIPGen(glob=ASTFIPGenGlobal(ip_offset="1.0.0.0"),
                            dist_client=ip_gen_c,
@@ -38,6 +38,7 @@ def create_profile(self, cps):
 
 parser = argparse.ArgumentParser()
 parser.add_argument('--mult', "-m", default=1, type=int)
+parser.add_argument('--duration', "-d", default=3600, type=int)
 args = parser.parse_args()
 
 c = ASTFClient()
@@ -47,7 +48,7 @@ def create_profile(self, cps):
 
 c.load_profile(Prof1().create_profile(1))
 c.clear_stats()
-c.start(mult=args.mult, duration=3600)
+c.start(mult=args.mult, duration=args.duration)
 print("started")
 
 def dig(d, keys):
diff --git a/examples/trex/external_encap_node/spec.yaml b/examples/trex/external_encap_node/spec.yaml
index ad23e6a..02b07d9 100644
--- a/examples/trex/external_encap_node/spec.yaml
+++ b/examples/trex/external_encap_node/spec.yaml
@@ -54,6 +54,12 @@ nodes:
 node_configs:
 - name: T1
   cmds:
+  - cmd: ip link set net0 down
+  - cmd: ip link set net0 address 52:54:00:01:00:01
+  - cmd: ip link set net0 up
+  - cmd: ip link set net1 down
+  - cmd: ip link set net1 address 52:54:00:02:00:01
+  - cmd: ip link set net1 up
   - cmd: nohup ./_t-rex-64 -i --astf --cfg ./cfg.yaml &
 - name: BR
   cmds:
@@ -96,15 +102,23 @@ postinit:
       ip table add 10
       set int ip table host-net1 10
 
+      set interface mac address host-net0 52:54:00:ff:00:01
       set interface mac address host-net1 52:54:00:01:00:02
       set interface mac address host-net2 52:54:00:02:00:02
 
       set int ip addr host-net0 2001::1/64
-      set int ip addr host-net1 20.0.0.1/8
-      set int ip addr host-net2 30.0.0.1/8
+      set int ip addr host-net1 50.0.0.1/8
+      set int ip addr host-net2 40.0.0.1/8
+      ip route add table 10 20.0.0.0/8 via 50.0.0.2 host-net1
+      ip route add 30.0.0.0/8 via 40.0.0.2 host-net2
+      ip route add 142.0.0.0/8 via fe80::5054:ff:feff:2 host-net0
       ip route add fc00:ff00::/24 via fe80::5054:ff:feff:2 host-net0
       ip route add fc00:3100::/24 via fe80::5054:ff:feff:3 host-net0
 
+      set ip arp host-net2 40.0.0.2 52:54:00:02:00:01
+      set ip arp host-net1 50.0.0.2 52:54:00:01:00:01
+      set int feature host-net0 ip4-not-enabled arc ip4-unicast disable
+
       sr localsid address fc00:1100:: behavior end
       sr localsid address fc00:1101:: behavior end.dt4 10
       set sr encaps source addr fc00:1100::