Behaviour of network in these cases

I have some questions regarding the network:

Case 1: Say the "eth0" is the current default interface, and say a 
server socket is listening on port 80.  What happens to the server 
socket when another interface, say "ppp0", is made the default?  Will 
this interrupt the server socket underneath the covers somehow?  What 
happens if "eth0" is then reset to be the default interface?  Will this 
affect things?

Case 2: Say a server socket is listening on port 80, and then the IP 
address is changed.  Are server sockets bound to a particular IP 
address?  What about the subnet mask?  Will changing this while a 
server socket is listening affect the server socket?

Case 3: Is PPP server supposed to vend a subnet mask?  I've seen a case 
where the mask becomes 255.0.0.0 after a connection is made, and there 
were some problems sending data over this interface.  Should I always 
set the subnet mask to 255.255.255.255 just to be on the safe side?  
Setting the mask to 255.255.255.255 in this case fixed the transmission 
problems.  If I have to set it, and if I have to restore "eth0", will I 
then have to reset it back to what it was before?  I'm trying o 
minimize my housekeeping.

Thanks,
	-Shawn

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