Installing and Administering Internet Services

Chapter 8 285

Conﬁguring gated

Customizing Routes

gated maintains a complete routing table in the user space, and keeps

the kernel routing table synchronized with that table. This section

describes statements for setting up customized routes in the Static class

of the gated conﬁguration ﬁle, /etc/gated.conf. These statements

can be used to specify default routers, static routes, passive interfaces,

and routing metrics for interfaces.

Specifying a Default Router

A static route provides a speciﬁc destination for network packets. The

static route can be a network address or host address through a router.

This route is installed in the kernel’s routing table. An example of a

static route for the default route is shown below:

static {

default gateway 15.13.114.196 retain ;

} ;

The retain qualiﬁer ensures that the entry is not deleted when gated

exists.

Installing Static Routes

The static statement speciﬁes a router or an interface in the kernel

routing tables. The following is an example of a static route:

static {

193.2.1.32 mask 0xfffffff0 gateway 193.2.1.30

preference 8 retain ;

} ;

If you specify an export statement for the default route, the route is

passed on to other routers. If only the static statement is speciﬁed and

not an export statement, then the default route is not passed on as a

route to other routers. This is considered a passive default route and is

used only by the host that this gated is running on. The retain clause

causes the route to be retained in the kernel after gated is shut down.