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Old 04-06-2013, 15:35   #16
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Re: OpenCPN 3.2.2 Mac Wont Repeat on TCP

night0wl, et al...

Before you ask, yes I am using SO_REUSEADDR for the TCP server socket...

Maybe this is broken in the wxMac network stack.

Dave
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Old 04-06-2013, 16:29   #17
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Re: OpenCPN 3.2.2 Mac Wont Repeat on TCP

Quote:
Originally Posted by bdbcat View Post
night0wl...

Something a bit odd on Mac, alright.

I find that TCP output works if you set the connection address to
0.0.0.0 (which is the same as "AnyAddress" in netspeak).

For some reason the Mac network stack will not bind (i.e. open) a server if the port is set to the physical port of the server itself. But linux seems to be able to do this.

This makes a little bit of sense; in OCPN, if the TCP connection is set as output, then O acts as a server. So he should be listening for connecitons from "anything on the specified port, e.g.10110", so to speak.

Any networking gurus are welcome to chime in with insight here. My understanding of TCP/IP is vague, especially when it doesn't work...

Anyway, please try this (0.0.0.0) and report back. If it works, I will make some adjustments to the OCPN TCP network code.

Thanks
Dave
You were absolutely right to suspect this was the issue!!!

For test, I connected to Frisco AIS on one inet connection. Then, I changed the broadcast TCP server to 0.0.0.0 and set it for repeat. This was the result (all as expected)




Then, I had my second mac (mountain lion w/3.2.2) connect to the snow leopard mac running 3.2.2 and this was the result....SUCCESS!!!




Wooo hooo! Even if this is a bug, Im very happy it all works. Great tip to use 0.0.0.0 as the IP of the TCP server!!!
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Old 05-06-2013, 04:45   #18
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Re: OpenCPN 3.2.2 Mac Wont Repeat on TCP

Quote:
Originally Posted by bdbcat View Post
For some reason the Mac network stack will not bind (i.e. open) a server if the port is set to the physical port of the server itself. But linux seems to be able to do this.

This makes a little bit of sense; in OCPN, if the TCP connection is set as output, then O acts as a server. So he should be listening for connecitons from "anything on the specified port, e.g.10110", so to speak.
I believe any POSIX system should be able to bind to a particular address if it is local and there's loads of instances where you'd want to do that: mail servers or ssh servers you don't want listening on all interfaces, or maybe you've got an Internet facing interface on your laptop that you don't want OpenCPN listening for connections on?

Just confirmed that kplex can happily bind to a local address (rather than INADDR_ANY) on MacOS 10.4 so maybe it's a wx problem?
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