DNS/Internet/networking problems

[Eirik Dentz <eirikdentz@brainlink.com>]

I just did a fresh install of Debian 2.2.18.  I'm using a Intel 10/100 Pro
PCI ethernet card on an i386 system.  I'm hooked up to the Internet through
a Linksys router that connects to a DSL modem.  I actually installed Debian
through this connection to the Internet without any problems.  Debian set my
/etc/network/interfaces file eth0 setting to dhcp.  And I didn't have any
problems reaching the internet with it configured this way.  In order to
serve web pages from my linux box though I have to set it to a fixed IP
address.  On my last install of Debian, I was able to switch the
/etc/network/interfaces eth0 setting to static and assign an IP address to
my linux box like so:

iface eth0 inet static
    address 192.168.1.9
    netmask 255.255.255.0
    broadcast address: 192.168.1.255
    network address 192.168.1.0
    gateway 192.168.1.1

And I had no problems reaching the Internet.

After applying these same settings to my fresh install, I can no longer
reach internet.

Let me clarify this a litte:

I am able to pull up my router's browser based configuration interface, so I
know that my http requests are getting as far as the router, but for some
reason they aren't getting passed through the router to the DNS servers.  I
checked the DNS addresses in my /etc/resolv.conf file and they are correct.
I also tried typing in an IP address rather that a domain name and I'm
getting a "TCP error: Network is unreachable"  I know that it is a problem
with the network configuration on my Linux box, because I'm not having any
problems on my other computer using the same network settings.  Is there
another configuration file that I've missed, or is there some security
mechanism that could be causing this?   Any help or advice would be
appreciated.

eirik