[Summary] - Can't ping from Alpha 8200

From: <SUSROD_at_HBSI.COM>
Date: Tue, 21 Oct 1997 12:26:47 -0700

Original message:

I have 2 alpha servers running DU3.2G and DU4.0B respectively. I cannot
ping from the 8200 to the 3000. I CAN ping the other direction (from
3000 to 8200). I can ping the 3000 from two other alphas in the same
subnet. I can also ping from the 8200 to other servers on the same
subnet.

Everything appears correct in my /etc/hosts file on both servers.

Does anyone have any suggestions?



Solution:

I realized - while using some netstat commands sent to me from someone
on the list - that the IP on the 3000 had been changed. This had
slipped my mind. The 8200 was missed when we changed all of our
/etc/hosts files to reflect the new IP.

Thanks to the responses of:

Craig Biggerstaff
Roger Picard
Phil Poole
Robert McMillin
Paul Kitwin
Jon Eidson
Brian Sheehan
Alexis Villagra

A few of their suggestions for your reference:

----
It sounds like the 8200 has bad routing table info.
Run "netstat -r" to see what is going on.  You might want to use the
"route"
command to manually flush the tables or add a static route to the 3000.
Craig Biggerstaff
----
	Try /usr/bin/traceroute hostname  on all machines and see
	what systems are in the path.  Also check your default
	route  netstat -rn | grep default  to see if your network
	gateway is correct.  
	If using DNS then check /etc/resolv.conf for correct domain
	and nameserver.
	Roger Picard
	
	The views expressed are mine and not my employer.
----------
	Check your default interface settings on the command prom
	mode.
	Also..check your network card manual and double check the
	speed at which your interface is running.
	I installed an Alpha 1000 and had a similar problem, the
	default was 100 base T on a 10 base T network.
	The problem sounds familiar.
	Also check your /etc/rc.config and you resolv.conf
	Our final problem was the following:  
	    The router was blocking all incoming and outgoing
	    IP traffic from the specific IP number the new
	    system was running.
	    So, it wasn't the Alpha at all but those other items
	    were checked as possible solutions.
Later.
--
       Phil Poole	| Unix Systems Administrator
---------
Since a ping is a two-way communication, there is either a hostname/IP
address mismatch or you're using more than one interface (e.g. the 8200
has a route that prevents it from seeing the IP address of the 3000,
but the 3000 can ping one of the 8200's interfaces, or something like
that).
Check your route tables, make sure they're correct; also make sure
subnet masks are all correct.
----------
Can you ping the IP address directly (ie dont ping via name)?  This 
might help you determine if it is a DNS problem.  Could also be
duplicate IP address problem.
Good luck, Jon.
_________
Hi Susan -
Do you have your /etc/routes file with your default route?  It's in the
form:
default xxx.xxx.xxx.xxx
 - Brian
_________
Hello:
I think that you need an static route, because your machines should be
in different networks.
Your 8000 should have this route added, you should check it with netstat
-nr or edit /etc/routes file.
Then you m8ust figure out which is your gateway and add a route to it.
Review command route.
Bye
-------------

Received on Tue Oct 21 1997 - 22:00:55 NZDT