[NTLUG:Discuss] Is there a such 'low power standby' phenomenons?

[Jared Cook]

--- m m <llliiilll at hotmail.com> wrote:
> 
> 
> 
> >From: Mark Bickel <eusmb at exu.ericsson.se>
> > > Is there a such 'low power standby' 
> phenomenons?
> > > what happpen to my box is that If I let the box
> idle for a while,
> > > then nobody can conncet to my server, even ping
> the box,
> > > the server is kind of 'dead'.
> > > but if I physically go back to 'use' the box
> (any kind of use, edit a 
> >file,
> > > telnet to some where...), the server become
> alive, all the servers
> > > works fine.
> >
> >I would look first at APM setings in the BIOS and
> also if any apm services
> >are running in the OS. Are any apm modules being
> loaded or apm compiled in 
> >the
> >kernel?
> 
> I double checked:
> There is no APM settings on the BIOS (disabled)
> no amp modules was compiled in the kernel.
> ampd is not rinning.
> 
> still has this problem.
> 
> any idea?
> 
> thanks
> 
> 
> 
I'm new here, but I'll be going to my first NTLUG
meeting soon.

Here's one from out in left field.  I had problems
with ARP while using an LVS/IPVS cluster.  There are a
lot of issues with virtual IPs and ARP addresses that
I won't get into here, but the bottom line is I had to
ping stuff in order to broadcast my ARP address
because the router would add another MAC to it's table
after a while.  {This might sound really strange, but
in LVS, you have the members with the same virtual IP
as the director, and if they are also responding to
ARP requests your director is left out in the cold)
I finally fixed it, but it was a nightmare trying to
figure it out.  

My point is this, if you are on the other side of a
router from the clients, your router may not have your
ARP address for some odd reason.  Yes, it should be
asking, but if another machine has the same IP, it
could be responding to the ARP request first, or not
responding at all for some reason.  This would explian
why you had to telnet and ping arround for the others
to get to you.

So, in a nutshell, check to see if another machine has
the same IP.   

Without more knowledge of your network topography it
can be difficult to determine what the problem 
is.

Jared Cook


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