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Cable modem, losing connection, 'resolved' by DHCP request

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http://www.linuxquestions.org – Running 2.6.29-gentoo-r1 on a Sun Ultrasparc 10 with a Sun Happy Meal on eth0 connected directly to my cable modem. Intermittently, with a frequency between a few hours and a few days, I lose internet connectivity. Running ifconfig eth0 indicates all is well and I have a valid IP address but I cannot even ping the cable modem's management address; pings to 127.0.0.1 and eth0's IP address do get a reply but no other address I've tried does. I can 'fix' the problem by issuing Code: dhcpcd -n eth0 . If I check the CM logs, it appears that it has rebooted itself prior to the loss of connectivit (HowTos)