Unable to reach hosts outside my subnet after initial installation

[Jon Radel]

Edward Lay wrote:
>> From: Derek Ragona <derek at computinginnovations.com>
> 
>> Check and/or create /etc/nsswitch.conf so you are looking in files and
>> dns for hosts.
> 
>> Check or create /etc/resolv.conf make sure your upsteam DNS servers
>> are listed in this file along with any local caching DNS servers.
> 
> Thanks for the suggestion.  Those files already exist with valid
> entries though.  In any event, it doesn't seem like a hostname problem
> as I can nslookup arbitrary hosts and then try and then ping the IP
> numbers directly which fails for hosts beyond the local subnet.  
> 
> It seems more like a router/gateway network configuration type of
> problem. I've just discovered that when I ping the gateway's IP
> address, I get no answer.  Now I know the gateway is functioning as
> every other host on the network can reach the rest of the internet and
> in fact, I've just successfully ping'd the gateway from the machine
> where I'm writing this message. So I'm wondering what could cause this
> or at least some way of approaching the problem. 

Do you have access to the gateway?  If so, can you ping the new machine 
from there?  If not, check the arp table on the gateway to see if your 
new machine has shown up.  Check that 128.32.157.5/32 routes the same 
place as the rest of the /24.

Only things I can think of that haven't already been covered are 
firewalling on the gateway, a rogue route for the /32 on the gateway, 
and the arp table on the gateway being locked down or having a static 
entry (or really, really long expire times) for the IP address you've 
given newdewey.  Ordinarily I'd worry that you had a longer netmask on 
the gateway than on your new machine, but with dewey at .3 (which works, 
yes?), newdewey  at .5, and the gateway at .1, this would be hard to 
arrange.

--Jon Radel
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