First, ping is not a very reliable service to use for testing. Some routers
block the packets that ping uses. In the examples you gace, I too could not
ping www.cnn.com, though I could traceroute to it. I could, however, ping
www.nasa.gov (though I got an unusual response), so your failure probably
does indicate a problem.
If you can ping by name and get an IP address back, you don't have a DNS
problem. You tell us almost nothing about your setup, though, so guessing
about what you do have is difficult. Are you attempting theese connections
from a Linux host that is itself connected to the Internet (via PPP, say),
or are you using a different host for the tests, one that routes through a
Linux host connected (somehow) to the Internet? Are you using IP
Masquerading? What Linux distribution, version, kernel version, and (if
applicable) pppd version are involved? How are you doing DNS -- do you run
named, or do you rely on outside servers listed in /etc/resolv.conf?
If you are using dialup ppp, can you ping, traceroute to, telnet to the host
on the other end of the ppp connection? (For that matter, can you telnet to
localhost?)
In any case, I'd start with the basics. See if the Linux host that is itself
connected to the Internet can successfully traceroute to some known sites.
If it cannot, check the output of "ifconfig" and "route -n" for
configuration errors (or if you don't know how, send us another message that
includes the *complete* output of those two commands). My guess is a routing
problem, but you've said too little for me to do more than offer that guess.
At 09:25 AM 8/30/99 +0200, David Huybregts wrote [in part]:
>When I'm connected to my ISP I can ping for
>instance www.cnn.com or www.nasa.gov. It gives me an IP-number but that's as
>far as it gets. I donnot receive any packets back...
>
>So... it this a DNS-problem? I guess not, because ping finds a IP-number
>which belongs to a host...
------------------------------------"Never tell me the odds!"---
Ray Olszewski -- Han Solo
Palo Alto, CA 94303-3603 [EMAIL PROTECTED]
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