topic Re: dhcpc & default gateway in Operating System - Linux

dhcpc & default gateway

Tom Dawson — Mon, 18 Feb 2002 00:04:49 GMT

I'm using RH 7.1 to connect to my ISP. The dhcp client is working. It gets the IP address and DNS server addresses. But the default gateway does not get updated, and, hence, I can not connect to the network. Any ideas on what configuration setting I might be missing?

TIA!
Tom

Re: dhcpc & default gateway

Eric Ladner — Mon, 18 Feb 2002 14:00:53 GMT

Check the .info file created in /etc/dhcpdc and see it if has the gateway information in the file. This file is created by the dhcp daemon and should be sourced by the routines in /etc/sysconfig that crank up the interface.

Re: dhcpc & default gateway

Kodjo Agbenu — Mon, 18 Feb 2002 20:21:19 GMT

Hello,

Depending on the PPP version, you may add the "defaultroute" and possibly "replacedefaultroute" options in your /etc/ppp/options file (or in the pppd command line).

Good luck.

Kodjo

Re: dhcpc & default gateway

Tom Dawson — Wed, 20 Feb 2002 00:51:49 GMT

Kodjo,

This is an ethernet connection to a cable modem. So I am not using ppp. Thanks!

Eric,

I can see that the dhcpcd-eth0.info file is getting updated. Do you happen to know where that file should get sourced or where the routes should be built? I've added the info from dhcpcd-eth0.info to /etc/sysconfig/static-routes but that doesn't seem to help.

Thanks,
Tom

Re: dhcpc & default gateway

Stuart Browne — Thu, 21 Feb 2002 05:29:55 GMT

You say that you are connecting via Ethernet, what is then connecting to the Internet?

Are you connecting via an ADSL/Cable router, which is what is doing the IP serving? if so, that is where you should be looking for the default gateway assignment.

The DHCP server is what should spit out those details. If it was another linux box answering DHCP, it would be because the 'dhcpd.conf' doesn't have a valid 'option routers ;' line.

If using some kind of router, it will be very specific to that router.

Re: dhcpc & default gateway

Jason B. — Mon, 25 Feb 2002 05:38:51 GMT

I don't know anything about how to setup dhcp... but I do know how to set the default gateway!

route add default gw 192.168.1.1

I know this doesn't answer you orig. question, but I hope it helps all the same : )

Jason B.

Re: dhcpc & default gateway

Eric Ladner — Tue, 26 Feb 2002 16:09:20 GMT

That file is sourced in the files in the directory /etc/sysconfig/network-scripts (or something like that).

Look for the ifup script. It mentions DHCP a lot and I believe that's where the file is referenced. (don't have my Linux box in front of me at the moment).

Re: dhcpc & default gateway

Bernie Vande Griend — Tue, 26 Feb 2002 16:25:37 GMT

Tom, where is the DHCP server? Your ISP? The easiest way to resolve this is to change the DHCP server so that is includes the router so it automatically updates your default router setting. As was mentioned earlier, if the master DHCP server was Linux, this is done by including a "option routers 192.168.1.1;" (or whatever your router is) in /etc/dhcpd.conf.

Re: dhcpc & default gateway

Ron Kinner — Tue, 26 Feb 2002 16:34:55 GMT

Guys,

He got this fixed. His box was running a firewall which blocked him. See his other post called Routing Experts.
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xea7850011d20d6118ff40090279cd0f9,00.html

Ron