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Internet Protocol (IP) Routing

Deﬁne 255.255.255.0 as a subnet mask for each end of the PPP link between 5390_01

and 5390_02 by setting the port parameter subnet_mask (see subnet_mask (port) on

page C2-60). Using admin, enter the following to set port asy4 on the 5390_01 :

admin: set port=4 subnet_mask 255.255.255.0

You may need to reset the appropriate port, Annex

subsystem or reboot the Annex for changes to take

admin: reset 4

reset default asynchronous port set [y]

Repeat the procedure for port 8 on 5390_02.

When the PPP link comes up, each Model 5390 server adds the remote address for its PPP port as

a network route in the routing table. For example, 5390_01 adds a route for the 132.254.2.0 network,

using 132.254.2.2 as the next hop to that network, with a metric of one (1).

Purpose of Static Routes

A static route is one you enter manually, as opposed to a route RIP learns from routing updates. For

most network conﬁgurations, you typically want to conﬁgure at least a few static routes. For example,

if a device to which your Model 5390 server will be routing does not itself advertise routes, you

will want to deﬁne a static route to that device. To ensure that the Model 5390 server uses deﬁned

static routes, specify them in an annex...end or subnet...end block in the gateway section of the

conﬁguration ﬁle. Static routes deﬁned elsewhere in the gateway section are discarded if the

interface is not up immediately after the Model 5390 server boots. This is not a problem for the

Ethernet interface, but SLIP and PPP interfaces can take longer to come up.

NOTE: If a subnet mask is unset for remote address 132.254.2.2, the

Model 5390 server assumes a mask of 0.0.0.0, which is interpreted as

255.255.255.255 (this applies to SLIP and PPP ports only). In this

case, 5390_01 adds to its routing table a host route for 132.254.2.2,

using 132.254.2.2 as the next hop to that host, with a metric of one (1).

This host route would be appropriate if 5390_02 were not connected to

an Ethernet.