A network engineer notes unstable connections and MTU issues with T-Mobile cellular ISP causing VPN drops, prompting a switch to Lumen fiber.

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  "company": {
    "name": "T-Mobile",
    "domain": "t-mobile.com"
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    "post_id": "1x6ptcm",
    "summary": "A network engineer notes unstable connections and MTU issues with T-Mobile cellular ISP causing VPN drops, prompting a switch to Lumen fiber.",
    "category": "reliability",
    "comments": [
      {
        "url": "https://www.reddit.com/r/paloaltonetworks/comments/1x6ptcm/comment/pgxkgs4/",
        "depth": 0,
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        "author": "matthewrules",
        "excerpt": "It’s either MTU, CGNAT, or IPv6/6to4.\n\n Drop the MTU and make sure SSL failback is enabled for them.",
        "posted_at": "2026-10-15T16:44:31.000Z",
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        "author": "gibby916",
        "excerpt": "What sort of MTU size are you using? I’ve had to reduce MTU to ~1320 for some users but my policy default is 1350",
        "posted_at": "2026-10-15T16:46:45.000Z",
        "author_url": "https://www.reddit.com/user/gibby916/"
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        "url": "https://www.reddit.com/r/paloaltonetworks/comments/1x6ptcm/comment/pgxdnfk/",
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        "author": "Professional_Tie6500",
        "excerpt": "GP 6.3.3 .. which Version? We had problems with Vodafone Users. the only version which worx is 6.3.3-1016 for us",
        "posted_at": "2026-10-15T16:16:48.000Z",
        "author_url": "https://www.reddit.com/user/Professional_Tie6500/"
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        "author": "McHildinger",
        "excerpt": "I've heard lowing the GlobalProtect Connection MTU can help, or forcing SSL (as you mentioned)",
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        "url": "https://www.reddit.com/r/paloaltonetworks/comments/1x6ptcm/comment/pgy6dnc/",
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        "author": "cnc33030",
        "excerpt": "I used to configure VPN site-to-site for a couple of small offices and GlobalProtect for a friend's office with T-Mobile cellular. My experience with T-Mobile was bad. The connection wasn't stable, causing the VPN S2S to drop intermittently. T-Mobile also has an odd MTU issue that prevents users from connecting to GlobalProtect. After I switched to Lumen (fiber), with the same setup, I never had t",
        "posted_at": "2026-10-15T18:13:37.000Z",
        "author_url": "https://www.reddit.com/user/cnc33030/"
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        "url": "https://www.reddit.com/r/paloaltonetworks/comments/1x6ptcm/comment/ph0sdu1/",
        "depth": 0,
        "score": 1,
        "author": "Dizzy_Head4624",
        "excerpt": "Try disabling IPv6 on the users router. Lucky most of our affected users use TPLINK How to Disable IPv6 on your TPLink Router (v1,v2,v3) | DNSFLEX",
        "posted_at": "2026-10-16T01:32:45.000Z",
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      "[comment u/cnc33030] My experience with T-Mobile was bad. The connection wasn't stable, causing the VPN S2S to drop intermittently.",
      "[comment u/cnc33030] After I switched to Lumen (fiber), with the same setup, I never had t"
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    "post_date": "2026-10-15T16:09:10.000Z",
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    "post_text": "First I had to make allowances for T-Mobile users. Forcing the client to SSL resolved their issues.\n\nNow I have ATT Air users getting ... gateway unreachable or unresponsive. frustrating.\n\nI'm sure others have seen this. Anyone have workable \"fixes\"?\n\nGP 6.3.3 PanOS 11.2.10",
    "sentiment": "negative",
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    "post_title": "Cellular ISPs are killing me..",
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        "name": "Lumen",
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curl https://signals.autobound.ai/v1/signals/e90b5f90-5f03-51f4-a500-110930f09f2d \
  -H "X-API-KEY: $AUTOBOUND_API_KEY"

curl -X POST https://signals.autobound.ai/v1/companies/enrich \
  -H "X-API-KEY: $AUTOBOUND_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"domain":"t-mobile.com","limit":20}'