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Conference noted::decnis

Title:	DEC Network Integration Server (DECNIS)
Notice:	Please read note 1 to use this conference effectively
Moderator:	MARVIN::WELCH

Created:	Wed Sep 18 1991
Last Modified:	Thu Jun 05 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	3660
Total number of notes:	15082

3610.0. "10.16.0.0 is it the zero subnet of mask 255.255.240.0?" by SNOFS1::63496::CHIUANDREW () Fri Apr 18 1997 05:09

    Hi,
    
    Just a simple question on IP subnet:
    
    Customer is using Ip addresses in 10.16.0.0 mask is 255.255.240.0 for
    LAN backbone and other block addresses in 10.16.248.0 mask
    255.255.248.0,
    they have a DECnis with ip address 10.16.15.254 running ospf, this
    address DOES FALL into 1st subnet of 10.16.0.0, when mask is 255.255.240.0
    is it correct?
    
    Reason, is some PC client CANNOT handle ip subnet-zero, just before we 
    start to look into the problem, can someone IP expert confirm that 
    10.16.0.0 with mask 255.255.240.0 IS or IS NOT 1st subnet in that
    block?
    
     
    
    thanks and regards,
    Andrew Chiu - NSIS Sydney

T.R	Title	User	Personal Name	Date	Lines
3610.1		UTRTSC::KNOPPERS	Oswald Knoppers	`Fri Apr 18 1997 06:34`	15
	> Reason, is some PC client CANNOT handle ip subnet-zero, just before we > start to look into the problem, can someone IP expert confirm that > 10.16.0.0 with mask 255.255.240.0 IS or IS NOT 1st subnet in that > block? It is: IP address: 10.16.15.254 Network mask: 255.255.240.0 Broadcast mask: 10.16.15.255 Network number: 10.16.0.0 Regards, Oswald
3610.2	is 10.16.0.0 is a subnet-zero ?	SNOFS1::63496::CHIUANDREW		`Sun Apr 20 1997 23:51`	14
	re .1, tnanks, My questions should be is 10.16.0.0, is it a subnet zero ip subnet? I think it is not, since 10.0.0.0 is the first subnet (subnet zero) with mask 255.255.240.0, but 10.16.0.0 is xxxth subnet in 10.0.0.0, is it correct? thanks again for any help/idea! Andrew Chiu - NSIS Sydney
3610.3		MARVIN::HART	Tony Hart, InterNetworking Prod. Eng. Group	`Mon Apr 21 1997 08:11`	10
	> My questions should be is 10.16.0.0, is it a subnet zero ip subnet? > mask = 255.255.240.0 No, its subnet number 0x100 (256). 10.0.16.0 is subnet number 1 10.0.0.0 is subnet number 0 Tony
3610.4	thanks, that's good news!	SNOFS1::63496::CHIUANDREW		`Mon Apr 21 1997 23:29`	7
	re .3 thanks a lot, customer is complaint that we use IP subnet zero for their backbone network and thanks again for your clarification. Andrew Chiu - NSIS Sydney