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Today's Topics:
1. Re: IP/MAC Mapping (Andy Millett)
--- Begin Message ---
Hi Oliver,
My bad, sorry about that! Here you go.
netdisco@tpe-librenms:~$ bin/netdisco-do arpnip -d 172.31.2.167 -D
[4059529] 2023-07-07 17:52:18 info App::Netdisco version 2.062002 loaded.
[4059529] 2023-07-07 17:52:18 info arpnip: [172.31.2.167] started at Fri Jul
7 18:52:18 2023
[4059529] 2023-07-07 17:52:19 debug arpnip: running with timeout 600s
[4059529] 2023-07-07 17:52:19 debug => running workers for phase: check
[4059529] 2023-07-07 17:52:19 debug -> run worker check/0 "arpnip"
[4059529] 2023-07-07 17:52:19 debug arpnip is able to run
[4059529] 2023-07-07 17:52:19 debug => running workers for phase: early
[4059529] 2023-07-07 17:52:19 debug -> run worker early/0 "prepare common data"
[4059529] 2023-07-07 17:52:19 debug => running workers for phase: main
[4059529] 2023-07-07 17:52:19 debug -> run worker main/1000000 "arpnip::nodes"
[4059529] 2023-07-07 17:52:19 debug skip: arp table data supplied by other
source
[4059529] 2023-07-07 17:52:19 debug -> run worker main/200 "arpnip::nodes"
[4059529] 2023-07-07 17:52:19 debug skip: driver or action not applicable
[4059529] 2023-07-07 17:52:19 debug -> run worker main/100 "arpnip::nodes"
[4059529] 2023-07-07 17:52:19 debug snmp reader cache warm: [172.31.2.167]
[4059529] 2023-07-07 17:52:19 debug [172.31.2.167:161] try_connect with ver: 2,
class: SNMP::Info::Layer3::CiscoSwitch, comm: <hidden>
[4059529] 2023-07-07 17:52:19 debug -> run worker main/100 "arpnip::subnets"
[4059529] 2023-07-07 17:52:19 debug [172.31.2.167] arpnip - found subnet
100.64.0.0/30
[4059529] 2023-07-07 17:52:19 debug [172.31.2.167] arpnip - found subnet
10.219.212.0/24
[4059529] 2023-07-07 17:52:19 debug [172.31.2.167] arpnip - found subnet
10.219.212.0/24
[4059529] 2023-07-07 17:52:19 debug [172.31.2.167] arpnip - processed 3 Subnet
entries
[4059529] 2023-07-07 17:52:19 debug => running workers for phase: store
[4059529] 2023-07-07 17:52:19 debug -> run worker store/0 "arpnip::nodes"
[4059529] 2023-07-07 17:52:19 debug resolving 0 ARP entries with max 50
outstanding requests
[4059529] 2023-07-07 17:52:19 debug [172.31.2.167] arpnip - processed 0 ARP
Cache entries
[4059529] 2023-07-07 17:52:19 debug [172.31.2.167] arpnip - processed 0 IPv6
Neighbor Cache entries
[4059529] 2023-07-07 17:52:19 debug => running workers for phase: late
[4059529] 2023-07-07 17:52:19 debug -> run worker late/0 "arpnip::hooks"
[4059529] 2023-07-07 17:52:19 debug [172.31.2.167] hooks - 0 queued
[4059529] 2023-07-07 17:52:19 info arpnip: finished at Fri Jul 7 18:52:19 2023
[4059529] 2023-07-07 17:52:19 info arpnip: status done: Ended arpnip for
172.31.2.167
Best regards
Andy
> On 7 Jul 2023, at 17:09, Oliver Gorwits <oli...@cpan.org> wrote:
>
> Hi Andy, you missed the -d out from the command so it failed. Please can you
> run again?
>
> On Fri, 7 Jul 2023 at 16:34, Andy Millett <a...@unimatrixzero.co.uk
> <mailto:a...@unimatrixzero.co.uk>> wrote:
>> Hi Oliver,
>>
>> Thanks a lot for the response. Unfortunately, SSH isn’t an option here
>> currently.
>>
>> Here’s the output of the netdisco-do command -
>>
>> netdisco@nms:~$ bin/netdisco-do arpnip 172.31.2.167 -D
>> [3644811] 2023-07-07 15:30:07 info App::Netdisco version 2.062002 loaded.
>> [3644811] 2023-07-07 15:30:07 info arpnip: started at Fri Jul 7 16:30:07
>> 2023
>> [3644811] 2023-07-07 15:30:07 debug arpnip: running with timeout 600s
>> [3644811] 2023-07-07 15:30:07 debug => running workers for phase: check
>> [3644811] 2023-07-07 15:30:07 debug -> run worker check/0 "arpnip"
>> [3644811] 2023-07-07 15:30:07 debug arpnip failed: unable to interpret
>> device param
>> [3644811] 2023-07-07 15:30:07 info arpnip: finished at Fri Jul 7 16:30:07
>> 2023
>> [3644811] 2023-07-07 15:30:07 info arpnip: status error: arpnip failed:
>> unable to interpret device param
>>
>> The device concerned is a -
>>
>> Hardware
>> Cisco 2921 (CISCO2921/K9)
>> Operating System
>> Cisco IOS 15.3(3)M10, RELEASE SOFTWARE (fc1) (UNIVERSALK9)
>>
>> Best regards
>> Andy
>>
>>
>>> On 7 Jul 2023, at 15:22, Oliver Gorwits <oli...@cpan.org
>>> <mailto:oli...@cpan.org>> wrote:
>>>
>>> Hi Andy
>>>
>>> We have seen that SNMP for ARP tables can be problematic on some platforms,
>>> and so Netdisco also supports SSH instead. It may be worth trying.
>>>
>>> Please see the docs here:
>>> https://github.com/netdisco/netdisco/wiki/Configuration#device_auth (see
>>> the parts about CLI driver and SSH, you have to add to config)
>>>
>>> And the list of platforms here (I guess IOS is relevant but maybe others):
>>> https://github.com/netdisco/netdisco/tree/master/lib/App/Netdisco/SSHCollector/Platform
>>>
>>> Another thought is if you're using VRFs and so far Netdisco doesn't have
>>> much support for that.
>>>
>>> Lastly you can enable debug and at the command line run the ARP gather job:
>>>
>>> ~netdisco/bin/netdisco-do arpnip -d 1.2.3.4 -D
>>>
>>> Do let me know how you get on,
>>>
>>> regards
>>> Oliver.
>>>
>>> On Fri, 7 Jul 2023 at 12:58, Andy Millett <a...@unimatrixzero.co.uk
>>> <mailto:a...@unimatrixzero.co.uk>> wrote:
>>>> Hi guys,
>>>>
>>>> I’ve got a really strange problem which has been around for a while, but
>>>> as we’re now doing Netbox/Netdisco integration with some customers is
>>>> causing some challenges. Basically, despite NetDisco querying a router’s
>>>> ARP table, with Arpnip we don’t see Netdisco making associations between
>>>> IP Address, and MAC address. So whilst I can search for a MAC address, and
>>>> the switch-port is returned, if I search for an IP Address for a node,
>>>> nothing is returned.
>>>>
>>>> Taking a PCAP of NetDisco performing an Arpnip, I can see it’s querying
>>>> the IP-MIB:ipNetToPhysicalTable, mappings are returned, none of this gets
>>>> into the database.
>>>>
>>>> The routers are mixed Cisco (ISR, ASR, 1921, 887, etc). Switches are
>>>> either Cisco or Juniper. Irrespective of switch vendor, no mapping of IP
>>>> to MAC is made unless the device is queried by Netdisco as part of the
>>>> inventory. The problem seems to be exclusively with Cisco routers, as
>>>> sites where a Juniper device is the gateway (either an SRX to an EX
>>>> switch) we see sound IP/MAC mappings in Netdisco.
>>>>
>>>> Any thoughts on this?
>>>>
>>>> Cheers
>>>> Andy
>>>>
>>>> _______________________________________________
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>>
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--- End Message ---
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