Sun Microsystems 3U - Manual (Page 66)

44 SunATM 3U CompactPCI Adapter Installation and User’s Guide • February 2001
Configuring a Classical Internet Protocol
Interface
Classical Internet Protocol (Classical IP), specified by RFC 1577, is one way of
supporting the TCP/IP and UDP/IP protocols in an ATM environment. In Classical
IP, an ATM ARP server is used to resolve IP addresses to ATM addresses, replacing
the traditional ARP protocol. In this configuration, each host must register with the
ARP server when the ATM interface is brought up. For more information on the
Classical IP protocols, see “Classical Internet Protocol” on page 67.
ATM ARP is used instead of the traditional ARP because ATM does not support
broadcast (a network capability providing transmission from one point to all points
on a network). Because Classical IP over ATM does not support broadcast, you
cannot use the
ypbind UNIX command with the -broadcast option to
automatically locate the NIS server (ypserver) on a Classical IP ATM subnet.
If you are planning to run NIS over your ATM network, use the ypinit -c
command to specify the list of NIS servers (ypservers). See the ypinit(1M) man
page for details of setting up the ypserver. Be sure that the IP addresses of the
ypservers are listed in the
/etc/hosts file.
The Routing Information Protocol (RIP) also uses the broadcast feature of IP, so it is
not supported under the Classical IP environment. In the Solaris operating
environment, RIP is implemented by the daemon
in.routed .
If you are using Classical IP only, you must explicitly add the routes to the routers in
the ATM subnet. You can also specify one router as the default router to provide
connectivity outside the ATM subnet. See the
route(1M) man page for information
on using the route command to add specific router entries and to add a default
router.
Editing the aarconfig File
The /etc/opt/SUNWconn/atm/aarconfig file is a generic file that must appear
on every SunATM system that is supporting Classical IP interfaces. It allows you to
specify IP to ATM address translation, permanent virtual circuits (PVCs) to
destinations, and the address of the ATM ARP server. The environment allows for a
mix of PVCs and switched virtual circuits (SVCs).
Each time the /etc/opt/SUNWconn/atm/aarconfig file is modified, run the ATM
ARP setup program, aarsetup , which is in the /etc/opt/SUNWconn/bin
directory.