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

[Chris Bullock]

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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