[cs615asa] [CS615] getting subnet masks from ifconfig

Xiakun Lu xlu9 at stevens.edu
Thu Mar 12 17:14:53 EDT 2015


$ ifconfig -a
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
	options=3<RXCSUM,TXCSUM>
	inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 
	inet 127.0.0.1 netmask 0xff000000 
	inet6 ::1 prefixlen 128 
$ ifconfig -a | ifcfg-data -n
0xff000000
0xffffff00

Hi professor,

“prefixlen 64” is also a net mask, but you don’t output it in your example.

Is that ok if I output “64”.
> How about this cases: 
> 
> inet6 ::1/128
> 
> Should "ifconfig -a | ifcfg-data -n? output ?/128? ?

That would be reasonable.

Best Regards,

Xiakun Lu
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