Installing and Administering Internet Services

Chapter 2 37

Installing and Conﬁguring Internet Services

Conﬁguring Internet Addresses

5. Add any other hosts to the /etc/hosts ﬁle that you need to reach. If

you will use a BIND, NIS, or NIS+ server on a different host, add that

host to your /etc/hosts ﬁle.

If you have no default gateway conﬁgured, and you add a host that is

not on your subnet, SAM will prompt you for the gateway. To stop the

prompting, conﬁgure a default gateway.

6. If you are not using SAM, you must conﬁgure a gateway for each host

that is not on your subnet. See “To Conﬁgure Routes” on page 37.

7. Make sure the /etc/hosts ﬁle is owned by user root and group

other, and make sure the permissions are set to 0444 (-r--r--r--).

To Conﬁgure Routes

1. If you use only one gateway to reach all systems on other parts of the

network, conﬁgure a default gateway.

You can use SAM to conﬁgure a default gateway, or if you are not

using SAM, issue the following command:

/usr/sbin/route add default gateway_address 1

where gateway_address is the IP address of the gateway host.

Then, set the following environment variables in the

/etc/rc.config.d/netconf ﬁle:

ROUTE_DESTINATION[0]="default"

ROUTE_GATEWAY[0]="gateway_address"

ROUTE_COUNT[0]="1"

If the default gateway is your own host, set the ROUTE_COUNT

variable to 0. Otherwise, set it to 1.

2. If your host is a gateway, conﬁgure the destination networks that can

be reached from its network interfaces. Issue the following command

for each network interface on your host:

/usr/sbin/route add net destination IP_address

where destination is a network address reachable by your host, and

IP_address is the address of the network interface.

Then, create a new set of routing variables in the

/etc/rc.config.d/netconf ﬁle for each network interface.

Whenever you create a new set of variables, increment the number in

square brackets, as in the following example: