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Today's Topics:
1. Re: IP/MAC Mapping (Andy Millett)
--- Begin Message ---
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
--- End Message ---
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