Re: Helper address usage

"I didn't mean to confuse the issue of this being needed, just a best
practice I use in production."
which is always a great addition to the discussion.

Thanks for the clarification.

On Mon, Apr 6, 2009 at 2:16 PM, Mark Cairns <m.a.cairns_at_gmail.com> wrote:

> Pavel,
>
> My apologies. For clarification, this is how I use the ip helper in a
> production network. It was meant to add more detail to Dale's comment. Most
> of the configurations I come across simply have a helper address turned on
> without any additional configuration. I agree, as far as the lab is
> concerned, configure exactly as requested with nothing additional. Don't
> fall into the trap of configuration in the real world. Many of us have
> specific ways of configuring features and when you do it on 500 or more
> sites, it can be hard to break that habit in the lab.
>
> I didn't mean to confuse the issue of this being needed, just a best
> practice I use in production.
>
> Mark
> #17755, Security
>
>
> On Mon, Apr 6, 2009 at 4:20 AM, Pavel Bykov <slidersv_at_gmail.com> wrote:
>
>> Mark, but you are being overly restrictive.
>> Unless the question does not explicitly states "do not forward any other
>> protocols" I wouldn't go this far.
>>
>>
>>
>> On Fri, Apr 3, 2009 at 3:41 PM, Mark Cairns <m.a.cairns_at_gmail.com> wrote:
>>
>>> Chris,
>>>
>>> I run the following with this setup:
>>>
>>> no ip forward-protocol nd
>>> no ip forward-protocol udp bootps
>>> no ip forward-protocol udp tftp
>>> no ip forward-protocol udp nameserver
>>> no ip forward-protocol udp domain
>>> no ip forward-protocol udp time
>>> no ip forward-protocol udp netbios-ns
>>> no ip forward-protocol udp netbios-dgm
>>> no ip forward-protocol udp tacacs
>>>
>>> Mark
>>> #17755, Security
>>>
>>> On Fri, Apr 3, 2009 at 8:56 AM, Fellenbaum, John D <
>>> john.d.fellenbaum_at_lmco.com> wrote:
>>>
>>> > Chris,
>>> >
>>> > You only need it on the local LAN interface where your DHCP client
>>> > resides.
>>> >
>>> > HTH
>>> > John
>>> > -----Original Message-----
>>> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf
>>> Of
>>> > Christopher Copley
>>> > Sent: Thursday, April 02, 2009 9:40 PM
>>> > To: Cisco certification
>>> > Subject: Helper address usage
>>> >
>>> > Group,
>>> >
>>> > I have a question on the proper usage of the helper address, and I can
>>> > not
>>> > lab this up to test. I have a DHCP server that is down stream from
>>> the
>>> > request by a few broadcast domains. Below is my network
>>> >
>>> > DHCP Client
>>> >
>>> |-------F0/0-R1-F0/1-----------|-----------F0/0-R4-F0/1--------------|--
>>> > ----------------F0/0-R3-F0/1--------------------|
>>> > DHCP Server 100.1.3.99
>>> >
>>> > So my thinking is put the helper address on F0/0 of R1 with address
>>> > 100.1.3.99, Do I also need to enable it on R4 and R3? and if so, on
>>> both
>>> > interfaces?
>>> >
>>> > Any ideas?
>>> >
>>> > Thanks
>>> > Chris
>>> >
>>> >
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>>>
>>>
>>>
>>
>>
>> --
>> Pavel Bykov
>> ----------------
>> Don't forget to help stopping the braindumps, use of which reduces value
>> of your certifications. Sign the petition at
>> http://www.stopbraindumps.com/
>>
>
>

-- 
Pavel Bykov
----------------
Don't forget to help stopping the braindumps, use of which reduces value of
your certifications. Sign the petition at http://www.stopbraindumps.com/
Blogs and organic groups at http://www.ccie.net