[c-nsp] UDP-helper problem

[Michael Robson]

Yup.

On 4 Mar 2009, at 21:30, Matlock, Kenneth L wrote:

> Extended ping using the source interface of Vlan937 as well works?
>
> Ken Matlock
> Network Analyst
> Exempla Healthcare
> (303) 467-4671
> matlockk at exempla.org
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Michael Robson
> Sent: Wednesday, March 04, 2009 2:28 PM
> To: chris at lavin-llc.com
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] UDP-helper problem
>
> Yes there is a route to a.b.c.d and yes we can ping the DHCP server
> from everywhere, including the new sup.
>
> On 4 Mar 2009, at 18:54, <chris at lavin-llc.com> wrote:
>
>> On Wed Mar  4  8:00 , Michael Robson  sent:
>>
>>> I have recently moved the routing of a subnet from an old sup2/msfc2
>>> 6500 (Version 12.1(26)E8, RELEASE SOFTWARE (fc1)) to a newer sup3/
>>> msfc3 6500 (Version 12.2(18)SXF13, RELEASE SOFTWARE (fc1)). On the
>>> old
>>> router the udp-helper command worked fine, but on the new router I
>>> can
>>> see the DHCP address coming in but not the reply coming back and the
>>> DHCP server isn't seeing the request arriving. Can anyone suggest  
>>> why
>>> this might have stopped working (it isn't an ACL or firewall issue  
>>> as
>>> there aren't any in the way) and I haven't turned _off_ any  
>>> component
>>> of udp-helper (i.e. using the ip forward-protocol command).
>>>
>>> interface Vlan937
>>> description XXXYYYZZZ
>>> ip address w.x.y.z 255.255.255.192
>>> ip helper-address a.b.c.d
>>>
>>
>> From this new sup, do you have a route to a.b.c.d? Can you ping the
>> DHCP server from this new sup?
>>
>>
>> -chris
>>
>
>
> Michael
> -- 
>
> Michael Robson           | Tel: +44 (0) 161 275 6113
> Senior Network Engineer  | Fax: +44 (0) 161 275 6120
> Net North West           | Email: Michael.Robson at manchester.ac.uk
>
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Michael
-- 

Michael Robson           | Tel: +44 (0) 161 275 6113
Senior Network Engineer  | Fax: +44 (0) 161 275 6120
Net North West           | Email: Michael.Robson at manchester.ac.uk