On Wed, 2010-03-17 at 11:02 +1300, Steve Shipway wrote: 
> 
> MRTG is not able to identify a match for this.

This was all working hunky-dory at one time, not too long ago.

> I assume the interface actually exists at the moment?

Yes, most definitely:

# ifconfig ppp0
ppp0      Link encap:Point-to-Point Protocol  
          inet addr:66.11.173.224  P-t-P:192.168.200.1  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1452  Metric:1
          RX packets:41506 errors:0 dropped:0 overruns:0 frame:0
          TX packets:44473 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:6719582 (6.4 MiB)  TX bytes:5437286 (5.1 MiB)

> Some systems will only create the interface in the SNMP when it is actually 
> up.  If this is the case then you don’t need to worry as you'll just get 
> 'unknown's while the interface is down.

But indeed, it's not so this is not the case, unfortunately.

> Can you run MRTG to check while the interface is up?

It runs every 5 minutes, complaining each time: 

2010-03-16 22:15:03: WARNING: Can not determine ifNumber for pub...@gw:         
ref: 'Type'     key: '23'
2010-03-16 22:15:04: ERROR: Target[gw_ppp0][_IN_] ' $target->[10]{$mode} ' did 
not eval into defined data
2010-03-16 22:15:04: ERROR: Target[gw_ppp0][_OUT_] ' $target->[10]{$mode} ' did 
not eval into defined data

and the interface has been up for 3 days now. 

> What device is this gw box?

It's an "OpenWRT" router, which basically just means Linux box.  It's
running net-snmp 5.4.2.1.

> It seems to be behaving oddly.

Indeed.  No argument here on that.  :-)

> I've only ever monitored a ppp interface on a Linux box and there it is 
> permanently visible

Until now.  :-)

Any other ideas?  Any other info I can gather/debug given that you know
it's a Linux box now?

b.

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