diff --git a/CHANGELOG.next.asciidoc b/CHANGELOG.next.asciidoc
index 7188f0c6b1a..4ab5cae63bc 100644
--- a/CHANGELOG.next.asciidoc
+++ b/CHANGELOG.next.asciidoc
@@ -219,6 +219,7 @@ automatic splitting at root level, if root level element is an array. {pull}3415
 - Add support for Okta debug attributes, `risk_reasons`, `risk_behaviors` and `factor`. {issue}33677[33677] {pull}34508[34508]
 - Fill okta.request.ip_chain.* as a flattened object in Okta module. {pull}34621[34621]
 - Fixed GCS log format issues. {pull}34659[34659]
+- Add nginx.ingress_controller.upstream.ip to related.ip {issue}34645[34645] {pull}34672[34672]
 
 *Auditbeat*
 
diff --git a/filebeat/module/nginx/ingress_controller/ingest/pipeline.yml b/filebeat/module/nginx/ingress_controller/ingest/pipeline.yml
index 4e682c0261e..ca000547e90 100644
--- a/filebeat/module/nginx/ingress_controller/ingest/pipeline.yml
+++ b/filebeat/module/nginx/ingress_controller/ingest/pipeline.yml
@@ -291,10 +291,17 @@ processors:
       field: related.ip
       value: "{{source.ip}}"
       if: "ctx?.source?.ip != null"
+      allow_duplicates: false
   - append:
       field: related.ip
       value: "{{destination.ip}}"
       if: "ctx?.destination?.ip != null"
+      allow_duplicates: false
+  - append:
+      field: related.ip
+      value: "{{nginx.ingress_controller.upstream.ip}}"
+      if: "ctx?.nginx?.ingress_controller?.upstream?.ip != null"
+      allow_duplicates: false
   - append:
       field: related.user
       value: "{{user.name}}"
diff --git a/filebeat/module/nginx/ingress_controller/test/test.log-expected.json b/filebeat/module/nginx/ingress_controller/test/test.log-expected.json
index 16aa75c2838..77a2918fd02 100644
--- a/filebeat/module/nginx/ingress_controller/test/test.log-expected.json
+++ b/filebeat/module/nginx/ingress_controller/test/test.log-expected.json
@@ -47,7 +47,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -107,7 +108,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -167,7 +169,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -227,7 +230,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -365,7 +369,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -425,7 +430,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -489,7 +495,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -553,7 +560,8 @@
             "172.17.0.6:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.6"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -617,7 +625,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -681,7 +690,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -745,7 +755,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -809,7 +820,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -872,7 +884,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -936,7 +949,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -1000,7 +1014,8 @@
             "172.17.0.6:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.6"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -1064,7 +1079,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -1128,7 +1144,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -1189,7 +1206,8 @@
             "172.17.0.6:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.6"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -1252,7 +1270,8 @@
             "172.17.0.5:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.5"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -1316,7 +1335,8 @@
             "172.17.0.6:8080"
         ],
         "related.ip": [
-            "192.168.64.1"
+            "192.168.64.1",
+            "172.17.0.6"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.1",
@@ -1383,7 +1403,8 @@
             "172.17.0.7:8080"
         ],
         "related.ip": [
-            "192.168.64.14"
+            "192.168.64.14",
+            "172.17.0.7"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.14",
@@ -1450,7 +1471,8 @@
             "172.17.0.7:8080"
         ],
         "related.ip": [
-            "192.168.64.14"
+            "192.168.64.14",
+            "172.17.0.7"
         ],
         "service.type": "nginx",
         "source.address": "192.168.64.14",
@@ -1681,4 +1703,4 @@
         "user_agent.os.version": "10.15.7",
         "user_agent.version": "104.0.0.0"
     }
-]
\ No newline at end of file
+]