[TriLUG] finding a MAC address

[Shawn Taylor]

1>

The phones are given an IP address in their configuration that is used to
pull down the boot image. This is configured in each phone manually or via
DHCP. It's not a broadcast that should be happening, it's a tftp connection
to a host.
(at the voip provider)

2>

Broadcasts are specific to a "Broadcast Domain" (VLAN or HUB). So you
wouldn't see that on the other side of a layer three device.

3>

The phone MAC address (and the phone system MAC address) should be contained
in the Ethernet header of the packet. This is what you would need to look at
if the packet was going out to the internet layer3. However if the packet is
going out via layer 2, then the mac information will be in the arp table of
the internet router.

Shawn


Scott Wrote:

They shouldn't go out.  So how is a MAC address being seen on another
network?   Does your VOIP company have a device on your network?