Can bitcoind listen on both ipv4 and ipv6?

Can bitcoind listen on both ipv4 and ipv6? I know it can make outbound connections on both (onion and i2p) but can it also advertise multiple public hosts if available?

This question was asked by pinheadmz on IRC.

iptables – Are IPv4 ports separated from IPv6 ports?

Is it possible for a host to have different open ports for IPv4 and IPv6 stack? For example, is it feasible to have the port 22 open only for IPv6 and not for IPv4 and vice versa? Also when I tried to block a port only for IPv6 it had no effect:

ip6tables -A INPUT -p tcp --dport 22 -j REJECT

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networking – k8s loadbalancer service with externalTrafficPolicy=local passes through client ip on IPv4, hides it on IPv6

I’m having trouble getting a kubernetes IPv6 SingleStack LoadBalancer service passing through the correct source IP address to pods. It works fine on a sister IPv4 SingleStack LoadBalancer that passes traffic to the same pods.

The cluster is a bare-metal v1.21.1 dual-stack cluster created with kubeadm and uses Calico v3.18 as the cni and MetalLB to allocate loadbalancer IPs to services configured with type: LoadBalancer. Calico is then configured to announce the loadbalancer IPs to the local router over BGP. Taking a toy example of a single nginx deployment with two services (one for IPv4, one for IPv6), if I curl the IP via the IPv4 address, the nginx access log prints the correct client IP in 192.168.2.0/24:

192.168.2.128 - - (01/Jun/2021:19:32:37 +0000) "GET / HTTP/1.1" 200 612 "-" "curl/7.64.1" "-"

But curling the IPv6 address from the same client in 2001:8b0:c8f:e8b0::/64, nginx shows a client IP address of fd5a:1111:1111::f31f

fd5a:1111:1111::f31f - - (01/Jun/2021:19:34:23 +0000) "GET / HTTP/1.1" 200 612 "-" "curl/7.64.1" "-"

This address is from the cluster’s serviceSubnet of fd5a:1111:1111::/112 and happens to be the clusterIP address of the IPv6 service. It seems like that something is actually doing some TCP proxying here (ipvs?), but it’s not clear why it’s behaving this way. I’d expect this if externalTrafficPolicy were Cluster – in fact, if I change the services from Local to Cluster, I get the local IP address of the cluster node forwarding the request on IPv4 (as expected), and the same clusterIP address on IPv6. externalTrafficPolicy appears to have no effect in the IPv6 case.

Am I missing something obvious, or should these services behave in the same way as each other?

Manifest of the test:

---
apiVersion: v1
kind: Service
metadata:
  name: test-service-source-ip-v4
  namespace: default
  labels:
    k8s-app: test-service-source-ip
spec:
  selector:
    k8s-app: test-service-source-ip
  type: LoadBalancer
  ipFamilies:
    - IPv4
  ipFamilyPolicy: SingleStack
  loadBalancerIP: 192.168.254.11
  externalTrafficPolicy: "Local"
  ports:
    - name: http-tcp
      protocol: TCP
      port: 80
---
apiVersion: v1
kind: Service
metadata:
  name: test-service-source-ip-v6
  namespace: default
  labels:
    k8s-app: test-service-source-ip
spec:
  selector:
    k8s-app: test-service-source-ip
  type: LoadBalancer
  ipFamilies:
    - IPv6
  ipFamilyPolicy: SingleStack
  loadBalancerIP: 2001:8b0:c8f:e8b1:beef:f00d::11
  externalTrafficPolicy: "Local"
  ports:
    - name: http-tcp
      protocol: TCP
      port: 80

---
apiVersion: apps/v1
kind: Deployment
metadata:
  namespace: default
  name: test-service-source-ip
  labels:
    k8s-app: test-service-source-ip
spec:
  replicas: 1
  selector:
    matchLabels:
      k8s-app: test-service-source-ip
  template:
    metadata:
      labels:
        k8s-app: test-service-source-ip
    spec:
      containers:
        - name: test-service-source-ip
          image: nginx:1
          ports:
            - containerPort: 80
              protocol: TCP

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Looking to Lease IPv4 Blocks in the US

Hello. I am looking for multiple /22, or multiple /23, /24 blocks of clean IPs that are already announced on an ISP. Can someone point me in… | Read the rest of https://www.webhostingtalk.com/showthread.php?t=1847570&goto=newpost

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