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Old 07-19-2001, 07:42 AM   #1
Sharmila Inamdar
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Java, dial-up connection and Linux

I've a dial up connection on my Linux machine as well as Ethernet connection. I can connect to the Internet using either the dial-up or through the Ethernet via proxy-server.

In case of dial-up connectivity,one of my Java program just hangs when my dial-up line goes down and doesn't wake up when the line comes-up. It doesn't throw any exception so that I can catch that line is down and act accordingly.

This is not the case with connectivity through Ethernet. If I stop network while the program is running , it immediately throws exception .."host not found " (that's what I want) and whenever I start the network , it immediately resumes.

Why can't dial-up scenario work the same way ? Can anybody put light on this?


Old 07-19-2001, 09:26 AM   #2
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I would have thought that the difference is that if your ethernet link goes down then the interface is still there, with a proper IP address etc, just not working. If your dialup fails then the pppX interface disappears all together, Java probably can't copy with this.

Just a guess really.


Old 07-20-2001, 03:12 AM   #3
Sharmila Inamdar
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well, i've tested the interface on ethernet and ppp.

I stopped the network when java was running. The ifcfg showd only loopback device and route-table had no entry except for lo.

Exctly the same was the route table and interface when I closed down ppp.

Then there must be something different in both... as u guess...

B'cause in case of ethernet , java throws exception "host not found" and in case of ppp.... Hang!

What next?


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