Re: dhcp vendor classes option


172.16.16.0/21 first scope for computers
192.168.11.0/24 second scope for voip

How many computers do you have?
300

How many phones do you have?
150

ok, so your masks are fine for your respective scopes, but I would caution
you against putting 2000 computers on the same subnet. Generally, with only
TCP/IP and no NetBIOS, you can do 500 safely and still get good network
performance. But that's a different discussion!

To have your get a DHCP address AND have them in their own VLAN, simply
configure a VLAN on your switch, put your phones in it, then do one of the
following: a) give your DHCP server an interface in that VLAN, or b)
configure a DHCP or BOOTP relay agent on your router (or layer 3 switch)
that points DHCP requests to a DHCP server.

Depending on the types of switches and/or routers you are using, and your
VLAN scheme, this can be done in a number of ways.


i think that you dont understand me :-), string ccp.avaya.com is
hardcoded
string in dhcp request packet in option 60

I may not understand you, but that string still seems odd to me. Why are
your phones asking for a resource that is located on the Internet?... If it
was a Cisco phone, for example, it would expect to receive the internal
address of a Call Manager server so that it could download it's image and
config from that server. If the Cisco phone received an address that was
located on the internet (such as ccp.avaya.com), then the phone would try to
contact that resource to get it's mage and config. This doesn't make sense
to me because it's too much if a security risk. But as I said, I don't know
the Avaya system, so I could be wrong... but it still seems fishy... :)

Oliver


lukas

when i deactivate first scope (computers scope), second phone scope
working
correctly.


Probabl because your computer scope encompasses your phone scope.

i know that vlan is better solution but i dont know how i can do it
with
one
dhcp server ?

The DHCP server needs to have an interface on each VLAN, OR, the router
or
layer 3 switch you have everything connected to needs to act as a DHCP or
BOOTP relay. As a relay, it can forward your client's DHCP requests to a
DHCP server on another subnet.

Oliver

Your



lukas

"Oliver O'Boyle" wrote:

yes. i see it, i have ASCII value ccp.avaya.com, binary 63 63 70 2E
61
76
61
79 61 2E 63 6F 6D in scope options table general too but ip phone
get
ip
address from bad scope :-(

Are your phones on the same subnet as your workstations?

Normally, it is a best practice to put them in their own separate
VLAN.
However, I have not implemented an Avaya solution yet, so I'm not sure
what
the vendor recommends. I prefer putting IP phones in their own VLAN
for
better manageability and security reasons.

Oliver


lukas

"Oliver O'Boyle" wrote:

"Adastra" <Adastra@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:80C609AF-9703-4763-BDEC-E86C937B9F06@xxxxxxxxxxxxxxxx
hi oliver,

i was unsuccesfull :-(.

How were you unsuccessful? After you create the option, are you
able
to
see
it in the DHCP Standard Options list?

Oliver

i have 1 superscope with 2 scopes, first is 172.16.16.0/21 for
computers,
second 192.168.12.1/24 is for avaya ip phones. i created
predefined
options
in options class - dhcp standard options - code 60, string
ccp.avaya.com (
vendor info is from ethereal)

do you have any proposal or hint ?

thank you

lukas

"Oliver O'Boyle" wrote:


"Adastra" <Adastra@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:68A7698D-BE2D-4947-800E-252D7CA35D76@xxxxxxxxxxxxxxxx
hi all,

i would like to use our main dhcp windows 2003 server for
avaya
ip
phones
and computers too. i tried to create a separate scope for ip
phones
only
with
vendor classes option 60 but without success. can you help me
with
it
please ?

thank you

lukas

Hi Lukas,

You need to open your DHCP MMC --> right-click on the name of
the
server
that will be hosting the scope for your IP phones --> select
"Pre-defined
Options" --> click "Add" --> enter your vendor information (put
the
number
"60" in the "code" field).

Once this option is created, you can use it in your scopes, as
needed.

Hope that helps,
Oliver














.

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