Mobile Hotspot vs Home Network Comparison | Generated by AI
Here’s the full picture of your mobile hotspot network vs your home network:
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MOBILE HOTSPOT (China Telecom 4G/5G) — Current Connection ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Network Path: MacBook (172.20.10.3) → iPhone hotspot (172.20.10.1) → China Telecom CGNAT → Internet
Real public IP: 183.42.160.71 (Shenzhen, Guangdong) Carrier: AS4134 CHINANET BACKBONE NAT layers: Double NAT (iPhone + CGNAT) Subnet: /28 — only 14 usable IPs MTU: 1500 (OK) IPv6: Native (240e:47e:1490:dbb0::/64) Proxy: 127.0.0.1:7890 (Clash → DMIT LA)
Performance (raw, no proxy): Ping to baidu: 15–1157ms, avg 215ms, jitter 341ms ← TERRIBLE 8.8.8.8: 275–625ms, 20% packet loss 114.114.114.114: 100% packet loss (ICMP blocked or carrier filtered) Direct IP ping: 100% loss (carrier blocks inbound ICMP on mobile)
Performance (via proxy — DMIT LA): Baidu: 229ms TTFB (proxy accelerates!) GitHub: 600ms TTFB Google: 478ms TTFB
Bandwidth: Download: ~291 KB/s (~2.3 Mbps) — slow Upload: ~68 KB/s (~0.5 Mbps) — very slow
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KEY DIFFERENCES vs YOUR HOME NETWORK (expected): ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Mobile Hotspot Home (China Telecom fiber) ───────────────────────────────────────────────────────────────── NAT layers Double NAT Single NAT Ping jitter 341ms (wild) ~2-5ms (stable) Ping avg 215ms to baidu ~5-15ms to baidu Download ~2 Mbps ~100-300 Mbps typical Upload ~0.5 Mbps ~30-50 Mbps typical Packet loss 20% to 8.8.8.8 0% ICMP inbound Blocked (CGNAT) Usually works IPv6 Native ✓ Native ✓ DNS Via phone gateway Direct to 100.100.100.100 Latency stability High variance Low variance
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ANALYSIS: ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
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JITTER IS THE BIG PROBLEM — 341ms stddev means your connection is wildly inconsistent. Some pings hit 15ms, others 1157ms. This makes SSH, video calls, and real-time tools painful. Cause: cellular radio congestion, signal handoff between towers.
- DOUBLE NAT — iPhone hotspot adds an extra NAT layer on top of
China Telecom’s CGNAT. This means:
- No inbound connections possible (no port forwarding)
- Extra latency hop
- Some protocols break (VPN, FTP, SIP)
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UPLOAD IS TRAGIC — 68 KB/s means git push, file uploads, and Claude Code conversations with large contexts will crawl.
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PROXY ACTUALLY HELPS — Your Clash proxy (DMIT LA) gives faster TTFB to international sites than direct connection. The proxy route through LA has better peering than China Telecom’s direct international links. Surprising but real.
- ICMP FILTERING — China Telecom mobile blocks most inbound ICMP. 114.114.114.114 and your own IP unreachable. This is normal for mobile networks.
BOTTOM LINE: Mobile hotspot is usable for light browsing and LLM API calls (small payloads), but terrible for anything latency-sensitive or bandwidth-heavy. Your home fiber connection is ~50-100x faster and far more stable. Use the hotspot as emergency backup only — the jitter alone will drive you crazy for development work.