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TechRepublic: Get your cable modem working with Linux [with DHCP]

Apr 07, 2000, 02:34 (0 Talkback[s])
(Other stories by Jack Wallen)

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"Unfortunately, setting up DHCP isn't as simple as setting up a static connection. The primary difference rests in the method by which the client must send the requisite hostname to the DHCP server. You can use the cable modem services; set up the Ethernet device with netcg, and run the dhcpcd client by sending the hostname with the -I flag in the following command (as root):

/sbin/dhcpcd -I hostname
This command will send the default client hostname that's set up with the Ethernet device."

"Unfortunately, you'll have to deal with many problems when you use DHCP. Some cable modem services are picky about how (and to which OSs) they give out Internet Protocol (IP) addresses. Also, some of the recent major releases (primarily Red Hat 6.1) don't have a functioning DHCP out of the box. There are upgrades and even better clients you can use, specifically the DHCP-client package, which is a very nice, simple interface. You can download the DHCP-client and use it as a structured and reliable client tool for DHCP. During the setup of DHCP-client, it reads a configuration file (/etc/dhclient.conf) that is rather complicated at first glance."

"The problem lies in the fact that due to the different ways in which services distribute IP addresses, it's difficult to outline a plan of attack. Often, it's best to shy away from running DHCP with Linux. But, with the growing popularity of cable modems, I'm sure that future releases of various Linux distributions will focus on getting DHCP to work more effectively out of the box."

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