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Hi I'm kind of new here and I really need help ASAP. Basically the problem was reguarding my internet connection. I have a 2wire 2701 HG-B router/modem and I have 2 computers connected to the internet at home. I found out that the problem was I could connect to the internet with any ONE of the computer. Right when I connect the ethernet cable to my other computer, internet disconnects. The problem continues and the internet disconnects both of my computers every 30 minutes. Any help would be please. Thanks!:)

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Concise expert summary: the behavior reported by — internet works with any single PC, plugging in a second PC immediately breaks connectivity, and both drop on a roughly 30‑minute cycle — narrows the likely causes to three areas: an addressing/DHCP conflict or a secondary DHCP server on the LAN; a gateway/hardware or firmware fault; or an ISP/session rule (PPPoE/DHCP) that allows only one client. Because a 2Wire 2701HG‑B normally provides DHCP + NAT for multiple hosts, simultaneous connections should work; the goal is to isolate whether the problem is on the LAN, at the gateway, or at the ISP.

Quick diagnostic checklist (in order)

  1. Confirm addressing and duplicates: on each machine run ipconfig /all (Windows) or ip addr (Linux) and note IPv4 address, gateway and MAC. Look for duplicate IPs or an APIPA address (169.254.x.x).
  2. Check the 2Wire’s client/lease table and logs: log into the gateway and view attached devices, DHCP lease time and any WAN/PPPoE disconnect messages. Correlate timestamps with the 30‑minute drops.
  3. Eliminate extra DHCP servers/ICS: ensure neither PC is running Internet Connection Sharing or a software DHCP server; set both to obtain IP automatically while testing.
  4. Swap ports/cables and test with a small unmanaged switch to rule out a bad port or cable and to see whether the disconnect happens immediately on plug‑in or after a timer.
  5. Verify who performs the ISP login: if the ISP requires PPPoE and each PC is running its own dialer, the second client can cause session conflicts — the gateway should handle the ISP login. Also check for firmware updates or consider a factory reset after saving settings.

Note on : that post lists many legacy dial‑up modem checks (idle timeouts, init strings and line‑noise fixes) which mainly apply to old dial‑up/Winmodem setups. For an ADSL gateway like the 2Wire, those items are generally not directly relevant, though power‑cycling hardware and confirming physical wiring remain sensible.

Record exact disconnect timestamps, the router log lines at those times, the WAN/DSL LED behavior and the IPs assigned before/after a drop. Those details will distinguish an ISP timeout from a LAN conflict or gateway bug and point to the correct next step.

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Member Avatar for ahihihi...

:| Idle timeout reached with your service. Make sure you have enabled dialing properties and then in dialing properties you have set it to disable call waiting.Devices on the same phone line can cause disconnects. Plug your modem phone line directly into the wall with no splitter or other devices on the same... upplug all devices from wall. To locate an offender, plug them back in one at a time and see which one causes the disconnect. Check modem reset: Some modems need to be manually reset even if you have the init string ATZ in extra settings. If it is an internal modem, cold boot your box for 1 minute. If it is an external modem turn the modem off for 20 seconds and then back on.A cold boot can often fix this. Some modems, like the Rockwell HCF and Rockwell 56soft do not autorenegotiate well and are very sensitive to line noise. by adding the init string AT+MS=V34, you disable 56k and usually help stay online. Software modems like the rockwell HCF and rockwell 56soft and the LTwinmodems, use processor power to process connection information. If, once connected, you open many process-intensive programs, you may slow the connection down enough to cause a disconnect.Check dialer properties for ip header compression and software compression settings. The Phone company can be doing work on the line, or a line can be worn and needs replacing phone line conditions, settings. Please check on "DON's Squirrel Theory" for origin of phone line noise.Updated modem drivers often can fix frequent disconnects by providing the latest firmwarm for the modem.

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