multiple aliases(IPs) same netmask...error...why?

[manish gautam]

Sir,
 
I am facing some problems ::
 
 
1. If i try to make aliases having same netmask like 255.255.255.0, it   
   gives error (  SCIOADDR  file exists..something like that)..Why is it  
   so ?
 
2. But if I try the same using netmask 255.255.255.255 it does'nt give 
   any error...why ?  
 
3. And what is the limit of aliases if netmask is 255.255.255.255 ?
 
Please reply as soon as possible.
 
Thanking You
 
Best Regards
 
Manish Gautam

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