Traceroute

[gminnerup]

I am trying to figure out while I have timeouts whenever trying to access a particular remote server. Using the traceroute command in Linux, I get nothing but asterisks for all hops, while tracert under Windows from the same machine shows text. All software firewalls are disabled.
If any network gurus read this, an additional question relating to the problem I'm investigating: I cannot reach a particular website using either https, ping, or tracert (timeouts), yet the rest of the web is fine. Other people can reach that address without a problem. The output of tracert goes all the way through the hops to just before the site in question, then timeouts. Any hints as to what the issue could be much appreciated!

[smpoole7]

Let's see if someone here can give a more specific answer, but it may be that the default timeouts in Windows are longer. Do a "man traceroute" to determine how to increase the timeouts under Linux.

As for that one Website being a problem, it's got to be on their end. If you can browse the Web otherwise, and your traceroute is making it to the final hop before stalling, that in and of itself tells you where the problem is.

[ab@novell.com]

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Being unable to reach a site via traceroute or ping means ICMP isn't
allowed at some point, which really doesn't mean much. If you can ping
google.com or somebody else that does not block ICMP then you're fine on
that front on your end but a lot of sites block ICMP for one reason or
another.

The HTTPS issues is a bit more pressing. Test it with something just
working at the TCP layer (I assume you've been using your browser thus
far, which is far more than a TCP utility) such as netcat:

netcat -zv ipAddresOrDNSOfTheSiteHere 443

If your output is that the port is 'open' then the issue is your browser.
If not then get a LAN trace of the same attempt and see if your packets
make it out (SYN) and if they respond with a SYN/ACK at least at which
point your box should finish up with an ACK and then the connection is
established (that's all that the netcat command above does, and then it
breaks the connection). If that works then netcat should say 'open' and
if it does not then netcat will usually give a reason why it failed
(Connection Refused, for example). To get a LAN/packet trace:

sudo /usr/sbin/tcpdump -s 0 -w /tmp/cap0.cap

Do your test while that's running, then use Ctrl+C to stop the trace.
Attach the compressed version of /tmp/cap0.cap here and we'll see what we see.

Good luck.





gminnerup wrote:
> I am trying to figure out while I have timeouts whenever trying to
> access a particular remote server. Using the traceroute command in
> Linux, I get nothing but asterisks for all hops, while tracert under
> Windows from the same machine shows text. All software firewalls are
> disabled.
> If any network gurus read this, an additional question relating to the
> problem I'm investigating: I cannot reach a particular website using
> either https, ping, or tracert (timeouts), yet the rest of the web is
> fine. Other people can reach that address without a problem. The output
> of tracert goes all the way through the hops to just before the site in
> question, then timeouts. Any hints as to what the issue could be much
> appreciated!
>
>
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[gminnerup]

Thanks all, the problem with accessing that website mysteriously resolved itself upon a router reset. No idea why...
But I'd still like to be able to get traceroute output. I've tried the traceroute command from the command line, and the Gnome network tools, and both only give me asterisks for each hop except the first (to the default gateway), which isn't much use at all.