08-03-2001 08:16 PM - edited 03-12-2019 12:08 PM
when using a pc running sniffer,i can see the
rtp streams from the mac address of the phone
my pc(running sniffer) is attached to and the
opposite phone in conversation. I do not know
that much about it but i would think if the phone
is a switch it would have a cam table and not
send the rtp streams out the port marked pc on
the phone. i tried this on two switches a 6509
using vlan 10 as the data vlan and vlan 100 as
the aux. vlan on both ports
then again on a 3524 with a voice vlan 100
and data vlan 10. the programming was done as
per the designing cisco voip networks guide.
also i put my pc running sniffer on a port straight
into the cat 6509 the port was programmed aux vlan 100 and data vlan 10 no phone involved and i could
see broadcasts from the call manager (vlan 100)
so i am thinking that if a port is to be used
by something other than a phone i should not
program the aux vlan on it to stop this.
I hope you can help me with this because i am
confused! mainly about the rtp steams .
thanks guys! Oh and if i set up the sniffer to look
at ip addresses instead of hardware addrress i
do not see any of the above mentioned only hsrp hellos to multicast address,no phones ip address,
no rtp streams
08-06-2001 12:14 PM
The phone has a three port switch (100 uplink, 10 internal, 100 PC port), but it is inside of an embedded device and is customized for the task. The ports are switched, but the phone traffic is purposely replicated to the PC port. Interestingly enough this was done so it would be easy to attach a sniffer to the PC port to troubleshoot any problems that might be occurring between the phone and other hosts. This solution does not require a hub or to span a port on a production switch to get a sniffer trace.
08-06-2001 12:32 PM
are there any plans to ever turn that off -- or at least let customers turn it off where they don't want nosy users seeing their phone traffic?
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