Wrong broadcast in route table ?A

[Nicolas Helleringer]

Hi all,

If you configure a NIC under W2K like this :

IP : 10.0.0.1
NET MASK : 255.255.255.0

i-e subnetting the reserved private A class network (RFC 1918), windows add
the following routes to your route table :

NET NET MASK GATEWAY INTERF METRIC
10.0.1.0 255.255.255.0 10.0.1.90 10.0.1.90
1
10.0.1.90 255.255.255.255 127.0.0.1 127.0.0.1 1
10.255.255.255 255.255.255.255 10.0.1.90 10.0.1.90 1

BUT the net should be 10.0.0.255 on the 3rd one (as we have a /24 mask ...)

no ?

Niko

 

[Steve Duff [MVP]]

I'm assuming your IP really is 10.0.1.0, not 10.0.0.1.

This is the subnet broadcast address (for broadcasting to
all subnets -- "(net,-1,-1)" in the parlance of RFC1122 as I
dimly recall), and I believe it is correct.

Steve Duff, MCSE
Ergodic Systems, Inc.

 

[Niko]

I'm assuming your IP really is 10.0.1.0, not 10.0.0.1.

Why ???

This is the subnet broadcast address (for broadcasting to
all subnets -- "(net,-1,-1)" in the parlance of RFC1122 as I
dimly recall), and I believe it is correct.

10.255.255.255 would have been my broadcast address if i was 10.0.0.1
with mask 255.0.0.0
As I am 10.0.0.1 with subnet mask 255.255.255.0 it shall be 10.0.0.255

Niko