[Click] Accessing the ingress interface of a packet

[Philip Prindeville]

So it's not kept as part of the packet's internal housekeeping?

I don't think that I've ever worked on a router where that wasn't part of a packet's state.

What would be involved in adding it as part of the intrinsic state?


On 1/1/11 1:47 PM, Pekka Nikander wrote:
> A typical way of doing that is to Paint the packet soon after receiving it from the interface, before muxing it with other traffic.  You can the use a PaintSwitch to demux it according to the interface it came through.
>
> --Pekka
>
> On 2011-01 -01, at 22:26 , Philip Prindeville wrote:
>
>> (Forgive the newbie questions... I'm having to learn Click in a hurry as I ramp up on a project.)
>>
>> Is there a built-in element that returns the ingress interface of a packet?
>>
>> I'm trying to write an elementclass in Click that modifies a packet and then sends it back out the same interface it came in on, but don't want to have one instance of it per-interface that it is used on.
>>
>> Thanks.
>>
>> -Philip