Android_ID无法用于FTP设备通信？作用及访问失败原因咨询

Hey there, let's break down your questions one by one to get everything sorted out:

This is almost certainly an IP conflict or router ARP cache glitch. Here are the most likely causes:

• Stale ARP cache: Routers use ARP tables to map MAC addresses to IPs. Sometimes old entries don't get cleared properly, leading to multiple MACs being linked to the same IP. Try restarting your router or manually clearing the ARP cache in your router's admin panel—this usually fixes the display issue.
• Static IP conflict: One of your devices (like the NAS or laptop) might have a static IP set to 192.168.3.112, while your router's DHCP server also assigned this IP to the Android device. Check each device's network settings: make sure static IPs are outside the DHCP pool range defined in your router.
• MAC spoofing (rare): In very rare cases, a device might be spoofing another's MAC address. But this is unlikely unless you've intentionally configured it—start with the first two fixes first.

The root issue here is local DNS resolution failure:

• When your Android device connects to the network, it sends a hostname (the android-################ string) to the router. But if your router isn't set up to register this hostname in its local DNS, or your accessing device (like your laptop) doesn't have this hostname-to-IP mapping cached, it can't resolve the name to 192.168.3.112.
• To fix this, you can either:
  • Add a manual hostname-to-IP mapping in your router's admin panel (look for "local DNS" or "hosts" settings).
  • Edit the hosts file on your accessing device: add a line like 192.168.3.112 android-################ (Windows path: C:\Windows\System32\drivers\etc\hosts; Linux/macOS path: /etc/hosts).

Let's clear up the confusion: Android ID has zero connection to network device identification or IP assignment.

• Android ID is a 64-bit hex string generated by the Android system for each device. Its main uses are:
  • App developers use it to uniquely identify devices for storing app preferences, syncing game progress, or tracking user behavior (with user consent).
  • Some services use it to verify device eligibility (like accessing paid app features or whitelisted services).
• Crucially, this ID is never sent to your router or DHCP server. Routers identify network devices using MAC addresses and the hostnames devices send during connection—they don't know anything about Android ID. That's why you can't use Android ID to track your device's dynamic IP or get the router to recognize it uniquely.

内容的提问来源于stack exchange，提问作者kdm6389