howto re-execute dhcp without re-booting?

minike · 04-22-2006, 08:23 AM

every time my isp goes down, and later get up again, I must restart the (cable)modem, but also the pc, coz it looks like
slack (or the dhcp service or whatever) needs to re-read the data the modem is supplying.
so, is there any way to re-execute the "read" process that slack execute during boot-time, just to avoid re-booting the whole box?
thanks in advance.

Alien Bob · 04-22-2006, 09:09 AM

Suppose your network interface is called "eth0", then the command to re-initialize the interface (including re-querying your cable modem for an IP address) is

Code:

/etc/rc.d/rc.inet1 eth0_restart

By the way, my cable modem has a browser based configuration interface, where I can instruct the modem to "renew" its IP address that it gets from my ISP. So, if I have problems with my ISP, I always just do this IP address renewal, and there is no need to power-cycle the modem. Maybe your cable modem has a similar feature?

Eric

minike · 04-22-2006, 09:27 AM

yeps, alien bob.. it's all I was looking for
thanx-a-lot

minike · 04-22-2006, 10:12 AM

sorry ... I didn't saw the 2nd part of your reply, til now..
I just finish reading my modem user's manual (motorola sb5100 series) and nothing says about a borwser based config ingerface.. in fact, in the troubleshooting section says "to restart the modem: un-plug it, or press the reset button in the rear panel" ..but there's no reset button in my modem, only a "stand-by" btn ( reset != stand-by

..so, guess there's no way but unpluggin the device. Despite of it, gonna make some google about it.
thanks again,

minike · 04-22-2006, 10:34 AM

yeeeps.. google rules!

my modem have a web-based interfase ..located at h t t p://192.168.100.1
think this is what you were talking about.. I can re-start the modem thru this page.. (your help was more useful than I expected)

btw: watta mysterious thing.. why the very modem manofacturer don't say a single world about this feature??
-best regards,

pdw_hu · 04-23-2006, 02:57 PM

also running 'dhcpcd -B' helps.