Forums > MaxMSP

message over networks

Aug 23 2010 | 12:45 pm

just in case I made a big mistake…

using udpsend, udpreceive with loopback adress… all is ok.
as soon as I want to use ip adress, it doesn’t work (here)

I have 2 computers which have to communicate.
using wireshark ethernet sniffer on the receiver, I can trace the message sent by the emitter.
no problem.

but max seems to not catch these messages excepted if I use internal loopback adress (=inside the computer only)

any ideas? ways?
a big trick I missed because I’m too bad …?
is there "a kind of" full-compliance OSC message test under the hood and mine wouldn’t be standard …?

oops, the patch:
[udpreceive] —– [print received]


Aug 23 2010 | 1:06 pm

Check any firewall settings – I’ve had a lot of issues with macs (especially on 10.5) that are set up conservatively, and the firewall is blocking MaxMSP.

Als – give [mxj net.maxhole] a quick try (probably the help file is all you need – boot it on both computers). If you can’t get maxhole communicating then it’s probably a network setup issue, rather than a MaxMSP problem.



Aug 23 2010 | 1:09 pm

shutted down it, all the same.

wireshark gets messages… it means the network is ok :-(

Aug 23 2010 | 1:32 pm

trying to troubleshoot that… without any success :-(

Aug 23 2010 | 1:57 pm

Try in terminal ping .
If it’s nothing occurs, ports aren’t fowarded, see your router config.

Aug 23 2010 | 1:59 pm

no router
only a basic LAN with a 24bits mask ip range
ping is ok

Aug 23 2010 | 2:32 pm

For both computers ? ping computer A on your computer B and inverse…
You are in local network ? Are you in automatic ip config ?
Have you indicate the port used to your object udpreceive ? And the ip and the port to your object udpsend ?

Aug 23 2010 | 2:34 pm

no problem for network connectivity.
static ips
ip/port on udpsend
port on udpreceive => and this one seems to receive ONLY on the loopback

Aug 23 2010 | 2:49 pm

did you try maxhole? If so – you got nothing?


Aug 23 2010 | 2:55 pm

maxhole are multicast I guess.
it doesn’t fit with my emitter :-(

Aug 23 2010 | 2:59 pm

Which port ?
Post your patch, because that should work without any problem

Aug 23 2010 | 3:09 pm

I’m sending basic osc over udp message from one side (I’m sure of this part because I can trace it on the receiver computer with a basic eth sniffer)
one more thing, the message captured are basically osc/udp standard.

and the patch on the other side is:

-- Pasted Max Patch, click to expand. --

only that.

one more (so strange) thing:
instancing udpreceive 9999 in max seems to correctly open the port (netstat -ap UDP shows that) BUT the bind s for the address.
nothing for 127. and for my 192.

Aug 23 2010 | 3:15 pm

change the port maybe… plenty of issues with 9999 apparently…

Aug 23 2010 | 3:23 pm

I tested a lot of ports.
when I change the port in the max object, the previous socket seems to be correctly killed (nothing appears in netstat)

all the same.

as I wrote, it is strange.
because means, AFAIK, all the network interfaces.
so it should include listening on my 192.

Aug 23 2010 | 5:58 pm

I am not sure where in the network stack Wireshark operates but it may be possible that your system has a firewall that is blocking your port. It wouldn’t block a packet sent to the loopback address so I would check for a software firewall. What system are you running the server (udpreceive) on?

Aug 23 2010 | 6:06 pm

no firewall for sure.
I found the problem!
I had a DOUBLE persistent route to probably my juniper network connect VPN ssl client :-(
now it is ok.
it was the problem :)
…thanks christopher!

that double route gave problem to bind the port correctly (curious)
I didn’t dig much, because it wasn’t the purpose :)

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Forums > MaxMSP