步骤

  1. 光猫改桥接。
  2. 路由器使能ipv6。
  3. 域名托管到cloudflare，可使用免费注册的dpdns.org域名。
  4. 获取cloudflare API token。
  5. cloudflare中增加一条AAAA记录，Name填: ddnsv6，Content填写: 240e:341:: ,
  6. 在内网ubuntu主机上配置DDNS脚本: cloudflare_ddns_ipv6.sh，修改其中的CF_API_TOKEN、CF_ZONE_ID、RECORD_NAME。
    1. CF_API_TOKEN为第4步中申请的token。
    2. CF_ZONE_ID在cloudflare的主机中，点击xxx.dpdns.org域名，进入页面的右下角查看。
    3. RECORD_NAME为第5步中添加的AAAA记录，比如ddnsv6.xxx..dpdns.org。
  7. crontab -l定时执行脚本 
    */15 * * * * /usr/local/bin/cloudflare_ddns_ipv6.sh
  8. cloudflare_ddns_ipv6.sh内容如下: 
    #!/usr/bin/env bash

# === Configuration ===
# --- Cloudflare API ---
# Create a Cloudflare API Token with Zone:DNS:Edit permissions for your specific zone
CF_API_TOKEN="YOUR_CLOUDFLARE_API_TOKEN" # Replace with your token
CF_ZONE_ID="YOUR_CLOUDFLARE_ZONE_ID"     # Replace with your Zone ID
# --- DNS Record ---
RECORD_NAME="your_subdomain.yourdomain.com" # Replace with the FQDN to update (e.g., home.example.com)
RECORD_TYPE="AAAA"                          # Use "A" for IPv4, "AAAA" for IPv6
# --- Behaviour ---
CF_PROXIED="false"                          # Use "true" for proxied (Orange Cloud), "false" for DNS only (Grey Cloud)
# --- State & Logging ---
# Optional: Use absolute paths if running from cron
STATE_FILE="/tmp/cf_ddns_ipv6.lastip"       # Stores the last known public IP address
LOG_FILE="/tmp/cloudflare_ddns_ipv6.log" # Log file location
# --- External IP Service ---
# Service that returns *only* your public IPv6 address
IPV6_SERVICE="https://api64.ipify.org"      # Alternatives: ip6.icanhazip.com, ifconfig.me/ip (sometimes returns v4/v6)
# === End Configuration ===

# === Helper Functions ===
log() {
    echo "$(date '+%Y-%m-%d %H:%M:%S') - $1" >> "$LOG_FILE"
    # Optionally echo to stdout as well if running interactively
    # echo "$(date '+%Y-%m-%d %H:%M:%S') - $1"
}

# Basic IPv6 Address Regex (adjust if needed for specific formats like ::1)
# This regex is simplified and checks for common structures.
is_ipv6() {
    [[ "$1" =~ ^([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}$|^([0-9a-fA-F]{1,4}:){1,7}:$|^([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}$|^([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}$|^([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}$|^([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}$|^([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}$|^[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})$|^:((:[0-9a-fA-F]{1,4}){1,7}|:)$|^fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}$|^::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])$|^([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])$ ]]
}

# === Sanity Checks ===
# Check if required tools exist
if ! command -v curl &> /dev/null; then
    echo "Error: curl is not installed." >&2
    exit 1
fi
if ! command -v jq &> /dev/null; then
    echo "Error: jq is not installed." >&2
    exit 1
fi

# Check if configuration seems valid (basic checks)
if [[ "$CF_API_TOKEN" == "YOUR_CLOUDFLARE_API_TOKEN" ]] || [[ -z "$CF_API_TOKEN" ]]; then
    echo "Error: CF_API_TOKEN is not configured." >&2; exit 1; fi
if [[ "$CF_ZONE_ID" == "YOUR_CLOUDFLARE_ZONE_ID" ]] || [[ -z "$CF_ZONE_ID" ]]; then
    echo "Error: CF_ZONE_ID is not configured." >&2; exit 1; fi
if [[ "$RECORD_NAME" == "your_subdomain.yourdomain.com" ]] || [[ -z "$RECORD_NAME" ]]; then
    echo "Error: RECORD_NAME is not configured." >&2; exit 1; fi
if [[ "$RECORD_TYPE" != "AAAA" ]]; then
    echo "Error: This script is configured for AAAA records, but RECORD_TYPE is set to '$RECORD_TYPE'." >&2; exit 1; fi

# Create log file directory if it doesn't exist
LOG_DIR=$(dirname "$LOG_FILE")
if [[ ! -d "$LOG_DIR" ]]; then
    mkdir -p "$LOG_DIR" || { echo "Error: Could not create log directory '$LOG_DIR'." >&2; exit 1; }
fi
# Ensure log file is writable
touch "$LOG_FILE" || { echo "Error: Could not write to log file '$LOG_FILE'." >&2; exit 1; }

# === Main Logic ===

log "Starting DDNS update check for ${RECORD_NAME}..."

# --- Get Current Public IPv6 Address ---
CURRENT_IPV6=$(curl -s -6 "$IPV6_SERVICE") # Use -6 to force IPv6 request
if [[ $? -ne 0 ]]; then
    log "Error: Failed to contact IPv6 service '$IPV6_SERVICE'."
    exit 1
fi

# Validate the fetched IP
if ! is_ipv6 "$CURRENT_IPV6"; then
    # Sometimes services return error messages or IPv4 if IPv6 isn't available
    log "Error: Fetched IP '$CURRENT_IPV6' from '$IPV6_SERVICE' does not look like a valid IPv6 address."
    exit 1
fi
log "Current public IPv6: ${CURRENT_IPV6}"

# --- Get Last Known IP Address ---
LAST_IPV6=""
if [[ -f "$STATE_FILE" ]]; then
    LAST_IPV6=$(cat "$STATE_FILE")
    log "Last known IP from state file: ${LAST_IPV6}"
else
    log "State file '${STATE_FILE}' not found. Will force update."
fi

# --- Compare IP Addresses ---
if [[ "$CURRENT_IPV6" == "$LAST_IPV6" ]]; then
    log "IP address unchanged (${CURRENT_IPV6}). No update needed."
    exit 0
fi

log "IP address changed (Current: ${CURRENT_IPV6}, Previous: ${LAST_IPV6}). Updating Cloudflare..."

# --- Cloudflare API Interaction ---

# Common Headers
HEADERS=(-H "Authorization: Bearer ${CF_API_TOKEN}" -H "Content-Type: application/json")

# --- Get Record ID ---
API_URL_GET="https://api.cloudflare.com/client/v4/zones/${CF_ZONE_ID}/dns_records?type=${RECORD_TYPE}&name=${RECORD_NAME}"
log "Fetching Record ID from Cloudflare for ${RECORD_NAME}..."

RECORD_INFO_JSON=$(curl -s -X GET "$API_URL_GET" "${HEADERS[@]}")
if [[ $? -ne 0 ]]; then
    log "Error: Failed to connect to Cloudflare API (GET)."
    exit 1
fi

# Check if the API call was successful before parsing
SUCCESS=$(echo "$RECORD_INFO_JSON" | jq -r '.success')
if [[ "$SUCCESS" != "true" ]]; then
    ERRORS=$(echo "$RECORD_INFO_JSON" | jq -r '.errors | map("\(.code) \(.message)") | join(", ")')
    log "Error: Cloudflare API (GET) failed. Errors: ${ERRORS:-Unknown API error, check JSON response}"
    log "API Response (GET): ${RECORD_INFO_JSON}"
    exit 1
fi

# Extract Record ID
RECORD_ID=$(echo "$RECORD_INFO_JSON" | jq -r '.result[0].id') # Get ID of the first matching record

if [[ -z "$RECORD_ID" ]] || [[ "$RECORD_ID" == "null" ]]; then
    log "Error: Could not find Record ID for ${RECORD_NAME} (Type: ${RECORD_TYPE}) in zone ${CF_ZONE_ID}."
    log "API Response (GET): ${RECORD_INFO_JSON}"
    log "Check if the record exists in your Cloudflare DNS settings."
    # Optional: Create the record if it doesn't exist (more complex, involves POST request)
    # log "Attempting to create the record..."
    exit 1
fi

log "Found Record ID: ${RECORD_ID}"

# --- Update DNS Record ---
API_URL_PUT="https://api.cloudflare.com/client/v4/zones/${CF_ZONE_ID}/dns_records/${RECORD_ID}"
log "Updating DNS record ${RECORD_ID} for ${RECORD_NAME} to ${CURRENT_IPV6}..."

# Construct JSON payload using jq for safety with special characters
JSON_PAYLOAD=$(jq -n \
    --arg type "$RECORD_TYPE" \
    --arg name "$RECORD_NAME" \
    --arg content "$CURRENT_IPV6" \
    --argjson proxied "$CF_PROXIED" \
    '{"type": $type, "name": $name, "content": $content, "ttl": 1, "proxied": $proxied}') # ttl:1 = Auto

UPDATE_RESPONSE_JSON=$(curl -s -X PUT "$API_URL_PUT" "${HEADERS[@]}" --data "$JSON_PAYLOAD")
if [[ $? -ne 0 ]]; then
    log "Error: Failed to connect to Cloudflare API (PUT)."
    exit 1
fi

# Check if the update was successful
SUCCESS=$(echo "$UPDATE_RESPONSE_JSON" | jq -r '.success')
if [[ "$SUCCESS" == "true" ]]; then
    log "Success: Cloudflare DNS record updated successfully for ${RECORD_NAME} to ${CURRENT_IPV6}."
    # --- Update State File ---
    echo "$CURRENT_IPV6" > "$STATE_FILE"
    if [[ $? -ne 0 ]]; then
      log "Warning: Failed to update state file '${STATE_FILE}'."
    else
      log "State file '${STATE_FILE}' updated."
    fi
    exit 0
else
    ERRORS=$(echo "$UPDATE_RESPONSE_JSON" | jq -r '.errors | map("\(.code) \(.message)") | join(", ")')
    log "Error: Cloudflare API (PUT) failed. Errors: ${ERRORS:-Unknown API error, check JSON response}"
    log "API Response (PUT): ${UPDATE_RESPONSE_JSON}"
    exit 1
fi
  9. 通过如命令查看日志，每15分钟会配置一次。 
    cat  /tmp/cloudflare_ddns_ipv6.log

验证网站

test-ipv6.com

其它可尝试方案

Reference