Can't connect to router on eth0

Markup · 06-19-2005, 04:57 PM

Hi, I'm trying to connect to my adsl modem/router using my ethernet device (intel e100) to do a debian net install. I've plugged in the cable and switched on the computer and the connection LED lights up on the router.
OK, so I've edited my /etc/interfaces file to read:

Code:

auto eth0
iface eth0 static
 address 192.168.2.1
 netmask 255.255.255.0
 gateway 192.168.2.0

The network has DHCP enabled but I'm using static for now. Also you'll notice that I haven't added the 'broadcast' or 'network' options to the interface file I'm not exactly sure what IP's to put for those if they are required?

OK, I then done an 'ifup eth0' and get a response saying something like 'link up - full duplex' so it seems to be working, further to this I done a 'ifconfig' and eth0 is shown. OK, so I go to ping the router address (gateway) and after a few seconds delay I get destination host unreachable. When I check 'route' it shows 2 entries:

Code:

Destination	Gateway		Genmask		Flags	Metric	Ref	Use	Iface
192.0.0.0	*		255.255.255.0	U	0	0	0	eth0
default		192.168.2.0	0.0.0.0		UG	0	0	0	eth0

Is the first entry the broadcast address? Anyway, you'll notice that Genmask is 0.0.0.0 on the default...shouldn't it be 255.255.255.0?

Ahh I'm confused please help.

mjsurette · 06-19-2005, 05:13 PM

I'm confused too. Why don't you let dhcp configure your interface? Unless you want to enable some services on it, it'll be a lot simpler.

If you insist on static IP addresses then you have to make it on the same subnet as your router. The 192.168.x.x addresses traditionally have a subnet mask of 255.255.255.0 which means that your IP and the routers IP have to have the first three sets of numbers the same. So if your router has an address of 192.168.0.1 you could make your computer 192.168.0.5 with a subnet mask of 255.255.255.0, which you should set. The broadcast address is usually set automatically from these two.

You should also set your router as your default gateway and edit your /etc/resolv.conf to set your router as your dns server.

If you want more details, check out the Network Administrator's guide at tldp.org.

Good luck.

Mike

Markup · 06-19-2005, 05:37 PM

Thanks Mike, I tried DHCP but ifup says that the device is not configured when I changed static to dhcp and comment out the address. I will checkout that guide shortly, but I'm starting to think that the trouble may be due to ICMP blocking on my router which I'm going to examine after I post this.

edit: it works!...my bad, I should have checked that first really.

Thank you once again.