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Intermittent slow internet troubleshooting

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#1 bigisch


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  • 12 posts
  • Local time:11:49 AM

Posted 07 September 2017 - 02:04 PM


- modem in bridge mode

- linksys 1200ac router

- linksys 24-port switch



- 2nd hop of a tracert to any WAN IP has excessive lag (1500ms +)

- LAN lag times normal throughout episode

- no discernible pattern of when it's laggy and not


Attempted resolutions:

- thought it might be an ISP, modem issue, or external firewall issue

      -> plugged directly into modem and lag was normal

      -> tried several WAN IPs of common sites

- thought it might be someone's computer flooding a WAN IP

      -> came into the office when it was just me and all client computers were idle; problem persisted

- thought it might be switch or router

      -> ping other LAN IPs, both wireless and wired with resulting lag being normal

      -> power cycled the router which has seemed to fix it


I'm having trouble on how to proceed. The router is brand new and the issue was happening on an older router too, so i have a hard time believing the router is fundamentally flawed. I appreciate any guidance on how to proceed.





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