I have a DSL service (Covad) which requires me to set the
subnet mask to a subnet having only 5 hosts:
gateway : 184.108.40.206
subnet mask: 220.127.116.11
IP's to use: 152.68.6.<250-254>
Unfortunately Linux does not let me set the subnet mask to
the above value. Solaris and Windows 98 do, and it works
fine on those OS's.
Please try a subnet mask of 255.255.255.248
18.104.22.168 is not a valid subnet mask.