DD-WRT "Dumb" Switch crashing WAN?

Discussion in 'DD-WRT Firmware' started by djmetropolis, Sep 19, 2017.

  1. djmetropolis

    djmetropolis Network Newbie Member

    I have a Asus RT-AC3200 running shibby tomato as my main router, generally runs very smoothly. I also have a Linksys E3200 running DD-WRT as a dumb LAN switch, behind the ASUS, no DHCP or NAT enabled on the Linksys switch. I have had this setup running smooth for over a year now.

    A few days ago, my ISP had a weather-related outage. All my stuff is in BackUPS and should be protected, and our internet is delivered via terrestrial wireless (Rise Broadband).

    Since then, my WAN IP lease seems to try to renew continuously and is unable to obtain an IP. The ISP reports that multiple MAC IDs are trying to connect, so I suspect something is sneaking past the NAT on the Asus main router somehow and showing its MAC ID to the WAN. After troubleshooting, I ended up totally re-flashing the ASUS with tomato again, and reconfigured the settings via GUI, not going back to the configuration backups. This fixed it for a day or so, but upon the next reboot of the ASUS, it was once again unable to find the IP on the WAN. Further troubleshooting isolated it to the Linksys DD-WRT Switch. I turn the switch off, with all other devices on, reboot the main router, everything runs fine. If I turn the Switch back on, the WAN will crash within about 30-40 minutes average time again.

    I did do a factory reset on the Linksys and reconfigured it back to a Switch according to the DD-WRT tutorial. I have not yet done a 30-30-30 reset on it, but plan to today. Also, I updated the DD-WRT firmware about 6-7 weeks ago, but it ran fine for quite some time on it, so I don't think that is the issue. Possibly a setting in the Dynamic Routing? I had Dynamic Routing on "Both" for a while, with the Advanced Routing set to "Router" as per the Switch tutorial. Maybe something isn't right there? Anyone help me out!
     
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