[LAU] Sending audio to another computer

[Ken Restivo]

On Mon, May 24, 2010 at 01:09:22PM +0100, Hakan Koseoglu wrote:
> Fons,
> 
> On 24 May 2010 09:33,  <fons at kokkinizita.net> wrote:
> > Machine A
> >
> > ??eth0 ?? 192.168.1.100 ?? general IP
> > ??eth1 ?? 192.168.99.1 ?? ??audio
> >
> > Machine B
> >
> > ??eth0 ?? 192.168.1.101 ?? general IP
> > ??eth1 ?? 192.168.99.2 ?? ??audio
> >
> As long as you have a netmask of 255.255.255.0 on the network cards,
> you don't have to set up a route. They're on the same network and will
> chat to each other w/o going throuh the default route. A routing is
> required when you want to chat machines outside your local network as
> defined by your netmask bits.

I think what might not be obvious is that a route is automatically created whenever a new interface comes up-- a route to its own local network.

i.e. right now my routing table is:

$ route -n
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
68.28.49.85     0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
0.0.0.0         68.28.49.85     0.0.0.0         UG    0      0        0 ppp0


If I bring up a local network, say:
$ sudo ifconfig eth0 192.168.42.177 up

The route to that 42 network is added to the routing table:
$ route -n
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
68.28.49.85     0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
192.168.42.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         68.28.49.85     0.0.0.0         UG    0      0        0 ppp0

Again, assuming we're keeping it simple and dealing with non-overlapping netmasks, a local route doesn't have to be added explicitly. Maybe that's what caused the confusion.

-ken