RE: {bb} Can't ping once host goes down??

[Ralf.Strandell@silja.com]

Hi

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1)If you cannot ping the server from the BB host until the BB host is
booted, then it might be some kind of addressing issue.

Check what "arp -a" and "netstat -r" tell you during and after the problem.

Is the ethernet(mac) address of the default gateway (and all other directly
connected hosts) still correct? If not, the delete it: arp -d def-gw-name.
It will then be reset automatically to the correct value.

Is the default route correct? Is there a static route to the destination
host? If there is then is it correct too? Any strange routes that shouldn't
be there?

Can you ping the host with a plain IP address? If you can, then there is
some strange DNS relared problem.
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2) In some strange way yoo could also have generated a huge number of
connections that are in CLOSE_WAIT state (not closed yet). This could maybe
affect the functionality you IP stack. Netstat tells it all, again.
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3) You could run "traceroute -n HOST_IP" to trace the route to the remote
host.
Use the "-n" (or equivalent) to skip name resolution. 
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> -----Original Message-----
> From: Ron [mailto:hereiam@dejazzd.com]
> Sent: 25. lokakuuta 2004 20:40
> To: bb@bb4.com
> Subject: {bb} Can't ping once host goes down??
> 
> 
> Folks:
> 
> When our BB box notices that one of our servers is 
> offline...it will show a red circle under the Conn 
> column...the others are purple.
> 
> When the server comes back and it online...our BB box still 
> will not "see" it as online!  I've logged onto the linux box 
> and tried to ping the server and to no avail.  
> 
> If I restart the box then things are fine.  I'm not sure why 
> it drops a server permanently when the issue is only temporary.
> 
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