diff --git a/ci-scripts/conf_files/gnb.sa.band78.51prb.usrpb200.conf b/ci-scripts/conf_files/gnb.sa.band78.51prb.usrpb200.conf
index c39f38d55e..a53fefea34 100644
--- a/ci-scripts/conf_files/gnb.sa.band78.51prb.usrpb200.conf
+++ b/ci-scripts/conf_files/gnb.sa.band78.51prb.usrpb200.conf
@@ -161,8 +161,8 @@ gNBs =
 
     NETWORK_INTERFACES :
     {
-        GNB_IPV4_ADDRESS_FOR_NG_AMF              = "192.168.68.194";
-        GNB_IPV4_ADDRESS_FOR_NGU                 = "192.168.68.194";
+        GNB_IPV4_ADDRESS_FOR_NG_AMF              = "172.21.16.109";
+        GNB_IPV4_ADDRESS_FOR_NGU                 = "172.21.16.109";
         GNB_PORT_FOR_S1U                         = 2152; # Spec 2152
     };
 
diff --git a/ci-scripts/xml_files/container_sa_b200_quectel.xml b/ci-scripts/xml_files/container_sa_b200_quectel.xml
index 3eff9cddfd..db4c9d1d67 100644
--- a/ci-scripts/xml_files/container_sa_b200_quectel.xml
+++ b/ci-scripts/xml_files/container_sa_b200_quectel.xml
@@ -185,14 +185,14 @@
     <class>Custom_Command</class>
     <desc>Trigger Reestablishment</desc>
     <node>ofqot</node>
-    <command>echo ci force_reestab | nc -N 192.168.68.194 9090 | grep -E 'Reset RLC counters of UE RNTI [0-9a-f]{4} to trigger reestablishment'</command>
+    <command>echo ci force_reestab | nc -N 127.0.0.1 9090 | grep -E 'Reset RLC counters of UE RNTI [0-9a-f]{4} to trigger reestablishment'</command>
     <command_fail>yes</command_fail>
   </testCase>
   <testCase id="060002">
     <class>Custom_Command</class>
     <desc>Verify Reestablishment</desc>
     <node>ofqot</node>
-    <command>echo ci get_reestab_count | nc -N 192.168.68.194 9090 | grep -E 'UE RNTI [0-9a-f]{4} reestab 1'</command>
+    <command>echo ci get_reestab_count | nc -N 127.0.0.1 9090 | grep -E 'UE RNTI [0-9a-f]{4} reestab 1'</command>
     <command_fail>yes</command_fail>
   </testCase>
 
diff --git a/ci-scripts/yaml_files/sa_b200_gnb/docker-compose.yml b/ci-scripts/yaml_files/sa_b200_gnb/docker-compose.yml
index a859159e59..e440cec52d 100644
--- a/ci-scripts/yaml_files/sa_b200_gnb/docker-compose.yml
+++ b/ci-scripts/yaml_files/sa_b200_gnb/docker-compose.yml
@@ -11,9 +11,11 @@ services:
         volumes:
             - ../../conf_files/gnb.sa.band78.51prb.usrpb200.conf:/opt/oai-gnb/etc/gnb.conf
             - /dev:/dev
-        networks:
-            public_net:
-                ipv4_address: 192.168.68.194
+        # for performance reasons, we use host mode: in bridge mode, we have
+        # unacceptable DL TCP performance. However, the whole point of
+        # containerization is to not be in host mode, so update this to macvlan
+        # later.
+        network_mode: "host"
         #entrypoint: /bin/bash -c "sleep infinity"
         healthcheck:
             # pgrep does NOT work
@@ -21,12 +23,3 @@ services:
             interval: 10s
             timeout: 5s
             retries: 5
-
-networks:
-    public_net:
-        name: sa-b200-gnb-net
-        ipam:
-            config:
-                - subnet: 192.168.68.192/26
-        driver_opts:
-            com.docker.network.bridge.name: "sa-gnb-net"