Re: Helper address usage

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
> ----------------
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Received on Mon Apr 06 2009 - 08:16:16 ART