can't ping the internet

Rodney Davis rodney at wincubic.com
Fri Feb 9 13:51:26 PST 2001


I ran tcpdump and I can see traffic so I think it is not a
hardware problem.

netstat -rn returns the following:

206.127.244.32	0.0.0.0		255.255.255.240   U 0 0 0 eth0
127.0.0.0	0.0.0.0		255.0.0.0	   U 0 0 0 lo
0.0.0.0		206.127.244.33	0.0.0.0		   U 0 0 0 eth

I am not sure what the middle one is.  It does not appear on any
other machine in my office.

Should I delete this?  And if so, how do I do that? route del 127.0.0.0
doesn't work!

thanks

rodney

-----Original Message-----
From: Dusty [mailto:dusty at sandust.com]
Sent: Friday, February 09, 2001 10:11 AM
To: Linux & Unix Advocates & Users
Subject: [luau] Re: can't ping the internet


Run "tcpdump" or someother sniffer on the system (on teh interface that goes
to the internet).  If you see traffic your hardware and physical connection
are ok.  If not it is a hardware problem.

The typical problem is your defaultroute.  Your "netatat -rn" should have
lines something like this:

192.168.1.0   0.0.0.0  255.255.255.0  eth0

0.0.0.0   192.168.1.1   0.0.0.0   eth0

You should have one route for your subnet and one route that is 0.0.0.0 to
your defaultrouter.

Dusty



> > I need help with configuring my linux box's network configuration.  I
> > can ping localhost and the router but I cannot ping any machines
> > outside the network.  ifconfig shows all of the right addresses and I
> > have looked at /etc/hosts and /etc/networks and they appear to be the
> > same as other machines on this network. When I use the netstat command
> > nothing shows "connected". Can anyone point me in the right direction
> > for resolving this dilemma?
>
> There are so many things that could go wrong with this that I couldn't
> even begin.
>
> Check your default route. (netstat -rn)
>
> Double check your network settings. Triple check them.
>
> Check your hub.
>
> check your resolv.conf. See if your DNS server is working.
>
> Check your ethernet card.
>
> netstat won't tell you what you need to know. I can't diagnose the problem
> without getting details. It's like telling your mechanic, my car doesn't
> work.
>
>
>
>
>
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