[TriLUG] strange networking ipcalc question solved (I'm an ID10T)

[Chris Bullock]

172.24.8.0/21 gives me the outcome I am looking for.
--- Chris Bullock <cgbullock at yahoo.com> wrote:

> forgot my basic networking.
> --- Chris Bullock <cgbullock at yahoo.com> wrote:
> 
> > I am trying to implement a new subnet in my network but CentOS will
> not
> > let me add the route.  I keep getting an "RTNETLINK answers: Invalid
> > argument"
> > Also please note the last ipcalc output.
> > Here is the output.
> > 
> > [cgb at router ~]$ sudo vi /usr/local/sbin/routes
> > [cgb at router ~]$ sudo /sbin/ip r add 172.24.8.0/24 via 192.168.10.2
> > [cgb at router ~]$ sudo /sbin/ip r add 172.24.8.0/22 via 192.168.10.2
> > [cgb at router ~]$ sudo /sbin/ip r add 172.24.8.0/20 via 192.168.10.2
> > RTNETLINK answers: Invalid argument
> > [cgb at router ~]$ ipcalc -bnm 172.24.8.0/24
> > NETMASK=255.255.255.0
> > BROADCAST=172.24.8.255
> > NETWORK=172.24.8.0
> > 
> > [cgb at router ~]$ ipcalc -bnm 172.24.8.0/22
> > NETMASK=255.255.252.0
> > BROADCAST=172.24.11.255
> > NETWORK=172.24.8.0
> > 
> > [cgb at router ~]$ ipcalc -bnm 172.24.8.0/20
> > NETMASK=255.255.240.0
> > BROADCAST=172.24.15.255
> > NETWORK=172.24.0.0
> > 
> > *** Notice the Network on the last.
> > cgb
> >  
> > 
> > 
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> 
> 
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