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Old 09-24-2003, 10:50 AM   #1
Registered: Oct 2002
Location: At my desk...
Distribution: RedHat, Fedora, Ubuntu
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DHCP Routing Question

If I configure an interface to use DHCP (say for an ADSL connection), will the routing table update itself when the IP changes?

I plan on setting a DHCP connection as the default route and was wondering what would happen when the IP changes...

Thanks in advance!
Old 09-24-2003, 11:14 AM   #2
Registered: Sep 2003
Location: Netherlands
Distribution: Debian 3.0
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I am not a pro myself, but in my experience:

DHCP will create a complete routing table after acquiring a lease. So your default route to the internet will be available after configuring the network card with dhcp. You won't need to edit the routing table manualy. I think this is done after each new lease you get. Also, your dhcp client keeps a database with old leases which wil be tried at first, the dhcp.leases file. Practically this means it wil always try to get the old ip again. Unless the dhcp server blocks this, you will have an almost static IP.


Old 09-24-2003, 01:00 PM   #3
Registered: Apr 2003
Location: Chicago, IL
Distribution: openbsd 3.6, slackware 10.0
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yep, i think gil's right. when you have a LAN setup, you only have to set the default gateway from a client computer running dhcpcd once and it should stick in the routing table. from then on, the routing table will be modified around the lease received from dhcpd (the DHCP server daemon).
Old 09-24-2003, 01:18 PM   #4
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cool... thanks...


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