softex's questions -server

softex

Asked: 2011-10-17 09:47:52 +0800 CST

Why would a UDP socket perform OK on wifi, but not on a cell network?

Noobish question -

I have a perl script running on a linux server which opens UDP port 7015. netstat -ulnp shows:

udp        0      0 0.0.0.0:7015                0.0.0.0:*                               16365/perl

nmap -sU -p 7015 'hostname' on a remote machine shows:

7015/udp open|filtered unknown

Now when I run a client java program on an Android device, and send a datagram, it works flawlessly under wifi, but not through the cell network - after wifi is turned off or the device is moved out of wifi range. Other than possible port-blocking by the provider, why would this socket work under wifi, but not GPRS?

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