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Forum Topic - io-net behavior with multiple cells: (3 Items)
   
Update
Vineet Garg
07/07/2010 12:52 PM
post58852
io-net behavior with multiple cells   
Hi

I have a system where io-net modules are arranged as follows:

cell 1, endpoint 0: ethernet up producer (responsible for interfaces en0 & en1)
cell 1, endpoint 1: ethernet up producer (responsible for interface en2)

cell 2, endpoint 0: ppp up producer ( responsible for interface ppp0) 
                             Same module registers IP-PPP convertor module to io-net


Question:
=====

How does stack determine which packets need to go through ppp interface? I ask this because my route table (shown below) is unable to explain this to me!
For example, if i ping 10.10.13.13 using example below, i do not know how stack determines that ppp0 is the correct outgoing interface.

When is the interface ppp0 (for that matter any other interface) is created? Is this when driver registers to io-net? so any ifconfig commands on that interface works only after driver has registered, right?

Any pointer to detailed explanation of what happens during io-net registration will be very helpful?

Regards
VG


ifconfig output
============
ifconfig
lo0: flags=8009<UP,LOOPBACK,MULTICAST> mtu 33212
	capabilities=7<IP4CSUM,TCP4CSUM,UDP4CSUM>
	enabled=0<>
	inet 127.0.0.1 netmask 0xff000000
en0: flags=842<BROADCAST,RUNNING,SIMPLEX> mtu 1500
	address: 00:40:43:32:87:f8
en1: flags=843<UP,BROADCAST,RUNNING,SIMPLEX> mtu 1500
	address: 90:70:20:01:88:00
	inet 10.118.209.171 netmask 0xffffff00 broadcast 10.118.209.255
ppp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	address: 00:e0:00:00:e0:00
	inet 192.168.253.145 netmask 0xffffffc0 broadcast 192.168.253.191
	inet alias 10.10.12.13 netmask 0xffffff00 broadcast 10.10.12.255
en2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	address: 00:40:43:15:03:cb
	inet 192.168.255.126 netmask 0xffffff80 broadcast 192.168.255.127
	inet alias 192.168.255.125 netmask 0xffffff80 broadcast 192.168.255.127


route show output
============
Destination      Gateway            Flags 
default          10.118.209.1       UG     
10.10.12.0       10.10.12.13        U      
10.10.12.13      10.10.12.13        UH     
10.10.13.13      10.10.13.13        UH     
10.118.209.0     link#3             U      
10.118.209.1     0:f:34:2b:64:c7    UH     
10.118.209.103   0:15:17:b9:bb:f4   UH     
10.118.209.106   0:21:9b:6d:90:e4   UH     
10.118.209.171   90:70:20:1:88:0    UH     
127.0.0.1        127.0.0.1          UH     
192.168.253.128  192.168.253.145    U      
192.168.253.145  192.168.253.145    UH     
192.168.255.0    link#5             U      
192.168.255.1    1a:70:1f:37:9:18   UH     
192.168.255.126  0:40:43:15:3:cb    UH     
255.255.255.255  10.118.209.171     UG
Sean Boudreau(deleted)
07/07/2010 1:12 PM
post58853
Re: io-net behavior with multiple cells   
On Wed, Jul 07, 2010 at 12:52:59PM -0400, Vineet Garg wrote:
> Hi
> 
> I have a system where io-net modules are arranged as follows:
> 
> cell 1, endpoint 0: ethernet up producer (responsible for interfaces en0 & en1)
> cell 1, endpoint 1: ethernet up producer 
(responsible for interface en2)
> 
> cell 2, endpoint 0: ppp up producer ( responsible for interface ppp0) 
>                              Same module registers IP-PPP convertor module to io-net
> 
> 
> Question:
> =====
> 
> How does stack determine which packets need to go through ppp interface? I ask this because my route table (shown 
below) is unable to explain this to me!
> For example, if i ping 10.10.13.13 using example below, i do not know how stack determines that ppp0 is the correct 
outgoing interface.

If you look at the output from 'netstat -rn' there's probably an
interface associated with that route (ppp0).

> 
> When is the interface ppp0 (for that matter any other interface) is created? Is this when driver registers to io-net? 
so any ifconfig commands on that interface works only after driver has registered, right?

Correct.
Vineet Garg
07/07/2010 1:41 PM
post58856
Re: io-net behavior with multiple cells   
Hi Sean

Is it possible that netstat -rn shows a route that is not seen in output of
"route show" ?

Another important to mention here is that i have not created any manual
route to accomplish this interface selection.
Can stack somehow automatically determine that a route towards this IP lies
on ppp0?

Regards
Vineet

On Wed, Jul 7, 2010 at 10:42 PM, Sean Boudreau <community-noreply@qnx.com>wrote:

> On Wed, Jul 07, 2010 at 12:52:59PM -0400, Vineet Garg wrote:
> > Hi
> >
> > I have a system where io-net modules are arranged as follows:
> >
> > cell 1, endpoint 0: ethernet up producer (responsible for interfaces en0
> & en1)
> > cell 1, endpoint 1: ethernet up producer (responsible for interface en2)
> >
> > cell 2, endpoint 0: ppp up producer ( responsible for interface ppp0)
> >                              Same module registers IP-PPP convertor
> module to io-net
> >
> >
> > Question:
> > =====
> >
> > How does stack determine which packets need to go through ppp interface?
> I ask this because my route table (shown below) is unable to explain this to
> me!
> > For example, if i ping 10.10.13.13 using example below, i do not know how
> stack determines that ppp0 is the correct outgoing interface.
>
> If you look at the output from 'netstat -rn' there's probably an
> interface associated with that route (ppp0).
>
> >
> > When is the interface ppp0 (for that matter any other interface) is
> created? Is this when driver registers to io-net? so any ifconfig commands
> on that interface works only after driver has registered, right?
>
> Correct.
>
>
>
>
> _______________________________________________
>
> Technology
> http://community.qnx.com/sf/go/post58853
>
>

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