TCPIP and 2 Interfaces

QNX Newsgroups (Archives) qdn.public.sysadmin
1

I have 2 QNX 4 boxes set up each with 2 ethernet cards en1 and en2. The QNX
networking works perfectly and is using both interfaces as far as I can tell
from netinfo -l.

I installed TCPIP on both machines and they can ping themselves perfectly
but cannot ping each other. The setup is dead simple, no routing involved at
all, IP number range and subnet masks are the same, everything I can think
of is setup correctly.

Has anyone run across this before? I’m guessing it has something to do with
the dual ethernet interfaces but who knows…

Thanks

Sheldon Parkes
sheldon@onlinedata.com

2

One potential catch with dual interfaces is that QNX can find them in wrong
order. So device en0 could be in fact jack #2 and en1 could be jack #1. That
happened to me…

– igor

“Sheldon Parkes” <sheldon@onlinedata.com> wrote in message
news:agv1tt$hvs$1@inn.qnx.com…

I have 2 QNX 4 boxes set up each with 2 ethernet cards en1 and en2. The
QNX
networking works perfectly and is using both interfaces as far as I can
tell
from netinfo -l.

I installed TCPIP on both machines and they can ping themselves perfectly
but cannot ping each other. The setup is dead simple, no routing involved
at
all, IP number range and subnet masks are the same, everything I can think
of is setup correctly.

Has anyone run across this before? I’m guessing it has something to do
with
the dual ethernet interfaces but who knows…

Thanks

Sheldon Parkes
sheldon@onlinedata.com

\

3

Yes I thought that as well so I tried various combinations of starting the
Socket on one node as en1 and the one on the other node as en2 etc with no
luck.

Oh well, thanks for the thought

Sheldon

“Igor Kovalenko” <Igor.Kovalenko@motorola.com> wrote in message
news:ah1ltv$jet$1@inn.qnx.com…

One potential catch with dual interfaces is that QNX can find them in
wrong
order. So device en0 could be in fact jack #2 and en1 could be jack #1.
That
happened to me…

– igor

“Sheldon Parkes” <> sheldon@onlinedata.com> > wrote in message
news:agv1tt$hvs$> 1@inn.qnx.com> …
I have 2 QNX 4 boxes set up each with 2 ethernet cards en1 and en2. The
QNX
networking works perfectly and is using both interfaces as far as I can
tell
from netinfo -l.

I installed TCPIP on both machines and they can ping themselves
perfectly
but cannot ping each other. The setup is dead simple, no routing
involved
at
all, IP number range and subnet masks are the same, everything I can
think
of is setup correctly.

Has anyone run across this before? I’m guessing it has something to do
with
the dual ethernet interfaces but who knows…

Thanks

Sheldon Parkes
sheldon@onlinedata.com



\

4

A follow up of things I tried to resolve why I can’t ping between 2 nodes. I
ran netsniff on the node that is 192.168.4.236 and pinged it from
192.168.4.239 and saw that the packets were actually arriving. Now can
someone please interpret what this means exactly:

In my netmap file node 8 ( which is 192.168.4.239 ) has

8 1 000102edbd2c
8 2 000476348299

Node 9 ( which is 192.168.4.236 ) has

9 1 0004763400d3
9 2 00047634829e


Now the MAC address for the Src in the netsniff output is the correct one
for en2 as I would expect. What exactly is ARP request sender? ( it contains
the MAC address for en1 for some reason - which is likely my problem ).

I tried using arp -s to map the ip address to the correct MAC address on
both nodes but still can’t ping. I seek the wisdom of the gurus out there…

Src 000476 348299 [8] Dst FFFFFF FFFFFF [?] Len 48 Lan 2(Eth)
1026914822
ARP request sender 00:01:02:ed:bd:2c 192.168.4.239 target 00:00:00:00:00:00
192.168.4.236

Src 000476 348299 [8] Dst FFFFFF FFFFFF [?] Len 48 Lan 2(Eth)
1026914823
ARP request sender 00:01:02:ed:bd:2c 192.168.4.239 target 00:00:00:00:00:00
192.168.4.236

Src 000476 348299 [8] Dst FFFFFF FFFFFF [?] Len 48 Lan 2(Eth)
1026914824
ARP request sender 00:01:02:ed:bd:2c 192.168.4.239 target 00:00:00:00:00:00
192.168.4.236

Src 000476 348299 [8] Dst FFFFFF FFFFFF [?] Len 48 Lan 2(Eth)
1026914825
ARP request sender 00:01:02:ed:bd:2c 192.168.4.239 target 00:00:00:00:00:00
192.168.4.236

Src 000476 348299 [8] Dst FFFFFF FFFFFF [?] Len 48 Lan 2(Eth)
1026914826
ARP request sender 00:01:02:ed:bd:2c 192.168.4.239 target 00:00:00:00:00:00
192.168.4.236


“Sheldon Parkes” <sheldon@onlinedata.com> wrote in message
news:agv1tt$hvs$1@inn.qnx.com…

I have 2 QNX 4 boxes set up each with 2 ethernet cards en1 and en2. The
QNX
networking works perfectly and is using both interfaces as far as I can
tell
from netinfo -l.

I installed TCPIP on both machines and they can ping themselves perfectly
but cannot ping each other. The setup is dead simple, no routing involved
at
all, IP number range and subnet masks are the same, everything I can think
of is setup correctly.

Has anyone run across this before? I’m guessing it has something to do
with
the dual ethernet interfaces but who knows…

Thanks

Sheldon Parkes
sheldon@onlinedata.com

\