Re: [Netdisco] Duplicate devices in Netdisco

[Max B. <ma...@wa...>]

Bob,

This is definitely a bug.  It seems that your router doesn't provide its list
of IPs to Netdisco.  What vendor and model is the router?  And what class does
Netdisco label the device as?  Try running a discover with debug for more
info...
    
    ./netdisco -D -d device

> I've tried looking in the Netdisco source to try and find out how it 
> decides what IP address to identify a device by, but I thought I should 
> check first and see if anyone else has seen this problem and already 
> knows how to fix it.  :-)

Here is how Netdisco will try to 1. find the "main" IP address for a device, 
and 2. Find all the IP Addresses that are attached to the device.  It calls
them "Aliases" and stores the results in the device_ip SQL table...

1. In netdisco:device_root() which is called from store_device() called from
discover(),   Netdisco will try and grab root_ip() from SNMP::Info::Layer3.

Inside SNMP::Info:Layer3::root_ip() Netdisco looks for a centralized IP
address in two spots :

    ospfRouterId.0
    ospfHostIpAddress

2. Then Netdisco will look (via SNMP::Info::ip_index()) for a list of all the IP
addresses a device has using the IP Address table that is part of RFC1213
(MIB-ii) -- ipAdEntIfIndex.   Every device that speaks SNMPv2 should have at
least that implemented.  

Maybe do an snmpwalk on the device and see what info is there from
mib-2. 

    snmpwalk -v2c -c public routername mib-2

(You may have to change the '2c' to '1' for older devices)

-m

On Thu, Jan 29, 2004 at 05:02:57PM -0700, Bob McCormick wrote:
> Is anyone else having problems with Netdisco finding the same device 
> more than once during discover?   I'm finding that after I do a 
> discover (netdisco -r <seeddevice), that some of my routers are in the 
> Netdisco database more than once.  For example, under device inventory 
> I can see one of my routers listed 5 separate times.   Each time is 
> with a different IP address.  Each of the IP's is a valid IP for one of 
> the interfaces on that router, but I would think Netdisco would try to 
> always use 1 IP to identify a device (loopback, lowest numbered IP 
> address, etc).
> 
> I've tried looking in the Netdisco source to try and find out how it 
> decides what IP address to identify a device by, but I thought I should 
> check first and see if anyone else has seen this problem and already 
> knows how to fix it.  :-)