[ixpmanager] Grapher Issues

[Nick Hilliard]

Mike Hammett wrote:
> Here's what I'm seeing from a customer port as well as the aggregate graph.

the empty graph means that there are no stats coming in from MRTG for
that port definition.  You should take a look at the service definition
for that graph and see if it corresponds with reality.

The graph with the straight lines means that mrtg lost data and is
inventing some back-fill.  Normally if there were a problem, it would be
flat all the way, but in this case it's flat, then there's a jagged edge
and then it's flat again.  This could mean that there's problem with
mrtg not running properly, but in any case, you need to check out the
interface definition in mrtg.cfg too and make sure that it's correct.

Note that MRTG can do this sort of thing if there are random mistakes in
the config file.  If your communities have a "@" in them, it might cause
this problem.  In fact, an "@" sign is something you should avoid
studiously in an SNMP community because lots of NOS's and SNMP libraries
assume it's a token delimiter between e.g. community and vlan (cisco
ios), or community and address (Net::SNMP, Net_SNMP, mrtg, etc).

If you're looking for a cryptographically secure password / token
generator which doesn't use punctuation symbols, openssl works well:

% openssl rand -base64 12

This is nice because it quantifies how much entropy you're using.

Nick