IPv6 "Connection Refused" Issue in OpenTelemetry Dual-Stack Cluster

[Tabjulsaigreeshma]

Hi,

I am using OpenTelemetry in a dual-stack cluster. While I can successfully send traffic to an IPv4 address, I am encountering issues with IPv6. When I attempt to send traffic to the IPv6 address, it throws a "connection refused" error.

Telemetry configuration:

receivers:
otlp:
protocols:
grpc:
endpoint: ${env:MY_POD_IP}:4317
http:
endpoint: ${env:MY_POD_IP}:4318

service configutation:

Type: ClusterIP
IP Family Policy: PreferDualStack
IP Families: IPv4,IPv6
IP: 10.97.27.117
IPs: 10.97.27.117,fc00:2000::f046
Port: otlp-grpc 4317/TCP
TargetPort: 4317/TCP
Endpoints: 192.168.23.100:4317
Port: otlp-jaeger 5778/TCP
TargetPort: 5778/TCP
Endpoints: 192.168.23.100:5778

curl https://10.97.27.117:4318/ -k -vvv [Ipv4 address]

• Trying 10.97.27.117:4318...
• Connected to 10.97.27.117 (10.97.27.117) port 4318
• ALPN: curl offers h2,http/1.1
• TLSv1.3 (OUT), TLS handshake, Client hello (1):
• TLSv1.3 (IN), TLS handshake, Server hello (2):
• TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
• TLSv1.3 (IN), TLS handshake, Certificate (11):
• TLSv1.3 (IN), TLS handshake, CERT verify (15):
• TLSv1.3 (IN), TLS handshake, Finished (20):
• TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
• TLSv1.3 (OUT), TLS handshake, Finished (20):
• SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256 / X25519 / id-ecPublicKey

$ curl https://[fc00:2000::f046]:4318/ -k -vvv ---- [Ipv6 address]

• Trying [fc00:2000::f046]:4318...
• connect to fc00:2000::f046 port 4318 from fc00:1000::1771 port 50142 failed: Connection refused
• Failed to connect to fc00:2000::f046 port 4318 after 0 ms: Couldn't connect to server
• Closing connection
  curl: (7) Failed to connect to fc00:2000::f046 port 4318 after 0 ms: Couldn't connect to server

curl https://localhost:4318/ -k -vvv

• Host localhost:4318 was resolved.
• IPv6: ::1
• IPv4: 127.0.0.1
• Trying [::1]:4318...
• connect to ::1 port 4318 from ::1 port 44534 failed: Connection refused
• Trying 127.0.0.1:4318...
• connect to 127.0.0.1 port 4318 from 127.0.0.1 port 53390 failed: Connection refused

Is there any specific configuration or additional steps required to properly handle dual-stack scenarios for IPv6 in this setup? How can I resolve the "connection refused" issue for IPv6?