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Troubleshooting PING

 
 
Carl Hilton
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      02-12-2004, 11:30 AM
OK, I have a LINUX box that is connected to my network and the outside
via a large switched router. Now, this box can PING everything inside
my network. However it can NOT ping anything outside my network... My
switch has the capability to monitor packets on all ports. Turning on
this feature for the port that the LINUX box is connected to, shows
packets ECHO (from the LINUX IP to the remote IP) and ECHO-R (from the
remote IP to the LINUX IP) for all my ping tests, both those that work
and those that do not. The only difference is that the LINUX box only
"sees" those that come from inside my network. Is there other packets
(UDP or ARP) that are required and might be filtered by my router if
they come from outside my network?

If I am on another workstation (Microsoft OS) that is connected to the
the router through a different port, I have no problems pinging the
ip's that are not working for the LINUX box. And both the LINUX box
and other workstation are on the SAME SUBNET..


Carl
 
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ANdre H
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      02-12-2004, 02:38 PM
What does netstat -r give ?
did you define a router for your linux,
what about the netmask ? ifconfig eth0

Regards
"Carl Hilton" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) om...
> OK, I have a LINUX box that is connected to my network and the outside
> via a large switched router. Now, this box can PING everything inside
> my network. However it can NOT ping anything outside my network... My
> switch has the capability to monitor packets on all ports. Turning on
> this feature for the port that the LINUX box is connected to, shows
> packets ECHO (from the LINUX IP to the remote IP) and ECHO-R (from the
> remote IP to the LINUX IP) for all my ping tests, both those that work
> and those that do not. The only difference is that the LINUX box only
> "sees" those that come from inside my network. Is there other packets
> (UDP or ARP) that are required and might be filtered by my router if
> they come from outside my network?
>
> If I am on another workstation (Microsoft OS) that is connected to the
> the router through a different port, I have no problems pinging the
> ip's that are not working for the LINUX box. And both the LINUX box
> and other workstation are on the SAME SUBNET..
>
>
> Carl



 
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