The IP address different from ether0 interface address
which is reported to the outside world during PPP or
SLIP protocol negotiation. Use this feature, if your
site should appear as a single IP address site.
Name service specifies the type of name resolution service used.
The possible values are domain name service dns(2) or network
information service nis(3). If either of them is not used, then
the value of the object is none(1).