![]() Didn't know that anything was wrong until we got a call from the cable company. I did so correctly so that the software did not send any LAN info upstream to the cable modem, but one day the app crashed and my brother tried to troubleshoot and screwed it up. ![]() I set up my LC to share the Internet connection so that my brother and my parents could get online. Routers were not yet a thing in the home and WiFi was a pipe dream. This actually happened to me way back at the dawn of the cable modem age when modems were two feet tall with deadly giant aluminum fins to shed heat. ![]() If you share your Ethernet Internet connection over the very same Ethernet cable that it comes in on rather than through an alternate interface like WiFi, you could inadvertently broadcast a rogue DHCP service upstream and if your modem is not configured to filter this traffic (almost every modern modem will filter it) then many of your neighbors up to everyone on your local trunk (every cable customer within a few miles of you) could end up getting their network address info from you and might get knocked offline.
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