Re: DHCP Query

Dhcp snooping or arp inspection? If not what are the port stats on the 7609 facing the server? The goal here is to understand why the 7609 is dropping the packet.

Also it could be an ios bug. If you statically assign an IP address are you able to ping the DHCP server?

Andy

Sent from my iPad

> On Jul 14, 2014, at 3:49 PM, Rakesh M <raaki.88_at_gmail.com> wrote:
>
> few corrections to the above email, sorry about some typos completely
> occupied with other thoughts.
>
> end-node sends a dhcp-discover packet to the 7609 router
>
> 7609 forwards the discover packet to the dhcp-server
>
> dhcp-server releases the offer packet for end-nodes request
>
> offer packet reaches the 7609 routers and it gets dropped there
>
> there are no service-policies applied to this interface , not any of copp
> policies are affecting this, any knob or something which has to be
> configured, i was reading in some online forums that port may have to be
> configured with port-fast command, i am not sure how far that will help
> will surely try it tomorrow
>
> service dhcp has been disabled on 7609 , but that has nothing to do with
> this setup technically.
>
> any ideas are welcome, there are not many outputs that i have here except
> for some replication results but again replication in gns3 works fine so i
> do not think that will help.
>
> Thanks
>
> ----
>
> Rakesh M
> Jncie-sp 02079
>
>
>> On Tue, Jul 15, 2014 at 1:07 AM, Rakesh M <raaki.88_at_gmail.com> wrote:
>>
>> Hello Experts,
>>
>> I am coming across a very strange problem with one of our customers
>>
>>
>> DHCP-SERVER -------service-instance-ethernet ---------7609 Series
>> -------service-instance ethernet------------ End-node
>>
>> both of them are in same bridge-domain as well and have same vlan
>> encapsulations id's
>>
>> end-node sends a dhcp-offer packet to 7609 , no relay here is required so
>> it forwards the packet to the dhcp-server,
>>
>> dhcp-server allocates the offer packet and sends it to 7609 and this time
>> , 7609 does not forward the traffic.
>>
>> there is absolutely nothing blocking anything verified everything still
>> issues seems unresolved, any experiences from your past ?
>>
>> Thanks
>>
>> ----
>>
>> Rakesh M
>> Jncie-sp 02079
>
>
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Received on Mon Jul 14 2014 - 16:29:56 ART