The machine which does nothing

Nicolas Haller nicolas at
Tue Jun 3 15:51:47 UTC 2008

On Tue, Jun 03, 2008 at 10:23:27AM -0400, Bill Moran wrote:
> In response to Nicolas Haller <nicolas at>:

> > Hi all,
> > 
> > I have a very strange problem with a machine. The box have a postfix
> > which give e-mail to an amavisd-new and deliver ham to mailboxes.
> > 
> > The problem is the mail queue grow but the machine doesn't work at full
> > capacity. CPU is 90% idle, vmstat don't see proc are waiting for
> > anything, disks are playing poker and there is a lot of RAM available.
> > 
> > The machine have this problem under freebsd 6.3 and 7.0-RELEASE with a
> > bi-Xeon Quad core.

> amavisd and postfix do a lot of stuff.  Could be timing out on DNS or
> other networking issues.  Grab a tcpdump while it's running and see
> if any networking is taking an extraordinary amount of time.

Ho, it seems my box randomly send ICMP port unreachable packets to my DNS
server. It's an another problem. I see my box doing the DNS request,
I see my DNS server answer and, sometimes, my box send the ICMP packet.

Anyone know why my box send ICMP port unreachable?

Nicolas Haller
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