Re: IP forwarding from one interface to another

On Sep 25, 11:32 am, dssuresh <dssure...@xxxxxxxxx> wrote:
In VxWorks 6.2, how to route an IP packet meant for some other
destination? For. eg., I have a dual core proprietary processor (cpu 1
& cpu 2), each with two interfaces, let's call it 1a & 1b, 2a & 2b.
The hardware architecture is such that any packet pinged for any
interface in cpu2 will always come to cpu1. My requirement is to route
the packets (meant for cpu 2) that arrive in cpu 1, to the appropriate
interface in cpu 2. For clarity, let's assign IP addr for all these
interfaces:

1a --> 30.7.1.1
1b --> 192.1.0.1

2a --> 30.7.1.2
2b --> 192.1.0.2

Note that, 1b & 2b are shared memory (virtual) interfaces. The
standard VxWorks shared memory driver is pulled in and made to poll
these interfaces. If any data arrives on these interfaces, it'll put
into the shared memory of the other interface. ie. If any packed
arrives on 1b, the shared memory driver that polls on this, picks up
the packet and sends it to 2b. The shared memory driver that polls on
2b picks up this packet and sends it to 2a.

Now, from some host (pc - Unix), if I "ping 30.7.1.2", due to the
hardware architecture, it'll come to 1a. From here, I need to route it
to 2a. How can this be achieved ?

In cpu 1's shell, I did "routeAdd("10.7.1.41", "192.1.0.1").

But I'm not able to see any packets in "192.1.0.1".

In general, if there are two interfaces (belonging to different
subnets as in this case) in VxWorks, how to send a packet from one
interface to another? ie. as a first step I want to send from 1a to
1b.

Thanks,
Suresh

Try following steps
Go to VxWorks kernel configuration
network protocol components -> Network IP v4 components ->IPV4
Set Enable IP forwarding between interfaces to TRUE (I suppose by
default it would be ipForwardCfg)
Rebuild image and try again.

VKG | Ritsoft Technologies




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