I am having a custom DNS server whose Kubernetes manifest yml looks like below. I am exposing the UDP port 53 using the loadbalancer.

---
apiVersion: v1
kind: Service
metadata:
  name: somedns-lb
  labels:
    k8s-app: somedns
    type: LoadBalancer
spec:
  # Expose the service as LoadBalancer to the outside
  type: LoadBalancer
  ports:
    # Define the access port from outside
    - port: 53
      targetPort: 53
      protocol: UDP
      nodePort: 30153
      name: some-dns
  selector:
    k8s-app: somedns
---
apiVersion: v1
kind: Service
metadata:
  name: somedns
  labels:
    name: somedns
spec:
  clusterIP: None
  selector:
    k8s-app: somedns
  ports:
  - port: 53
    protocol: UDP
    name: dns-udp
    targetPort: 53
---
# Deployment kind goes here

Now when I try to make a lookup from the host server where the Kubernetes is hosted like below, the DNS should have been resolved

dig +notcp -p 30153 @localhost <domain-name-to-be-resolved> ANY

#### Response I get is as below

;; reply from unexpected source: 127.0.0.1#xxxxx, expected 127.0.0.1#30153

If I try the same with the server domain name or server ip instead of localhost then the request gets expected response

dig +notcp -p 30153 @xxx-xxx.xxx-xx.com <domain-name-to-be-resolved> ANY

### response I get 

; <<>> DiG x.xx.x-1ubuntu1.13-Ubuntu <<>> +notcp -p 30153 @xxx-xxx.xxx-xx.com <domain-name-to-be-resolved> ANY
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22174
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;<domain-name-to-be-resolved>		IN	ANY

;; ANSWER SECTION:
<domain-name-to-be-resolved>	xxxxx	IN	A	x.xxx.xx.x
<domain-name-to-be-resolved>	xxxxx	IN	AAAA	<mac address>

;; AUTHORITY SECTION:
xxx.			xxxxxx	IN	NS	x.xx.xxx

;; ADDITIONAL SECTION:
x.xx.xx.		xxxxxx	IN	A	127.0.0.1

;; Query time: 0 msec
;; SERVER: xxx.xxx.xxx.xxx#30153(xxx.xxx.xxx.xxx)
;; WHEN: Thu Nov 05 16:47:42 CET 2020
;; MSG SIZE  rcvd: 113

I am unable to understand what's the issue here. Why the localhost doesn't return the result which the same server domain name or the the ip address does? Please let me know what am I missing here?