UDP's sendto() from two IP Addresses to IP Address from small LAN

===================
Windows XP Professional
===================

My PC belongs to two LANs

------------------------------------------
$ ipconfig

Windows IP Configuration

Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 10.1.1.200
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :

Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . : <stuff>
IP Address. . . . . . . . . . . . : 128.129.101.102
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . : 128.129.0.1
------------------------------------------


First LAN (big LAN): PC's IP Address is 128.129.101.102
Second LAN (small LAN): PC's IP Address is 10.1.1.200

Second LAN contains one more card: its IP Address is 10.1.1.1.

I sent two messages to IP Address 10.1.1.1 via UDP socket (the
sendto() command):
* from 128.129.101.102
and
* from 10.1.1.200.

IP Address 10.1.1.1 received both messages.

The question is: why did 10.1.1.1 receive message from 128.129.101.102
?
It seems that 10.1.1.1 and 128.129.101.102 are in different LANs.


Alex Vinokur
email: alex DOT vinokur AT gmail DOT com
http://mathforum.org/library/view/10978.html
http://sourceforge.net/users/alexvn

.

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