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User Datagram Protocol - scan LAN

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http://www.unix.com – I have three PCs in a LAN network. 1. Solaris 10 10/09 x86 ip adres: 192.168.30.120 netmask:255.255.255.0 2. Solaris 10 10/09 x86 ip adres: 192.168.30.48 netmask:255.255.255.0 3. LINUX Suse 11 ip adres: 192.168.30.50 netmask:255.255.255.0 The heading for Suse Linux UDP packets to PC 2 The first PC program scans LAN via wireshark or snoop. UDP communication between PC 1 and 2 not see. I do not understand why? If you run a program wireshark on PC 3, and PC 2, see UDP communication. I'm working on a few Linux. I prefer Solaris. Linux may prohibit default visibility on the network? (HowTos)