Asentria SiteBoss 530 User Manual
71
Default Router
The Default Router setting allows you to select the default router (gateway) for the S530. This tells the S530 which
router to use if a packet is not on any of the LANs defined on the network port. The default router is selected from the
routers defined for the Ethernet ports.
More information for advanced users:
The Default Router setting allows you to select the default router (gateway) for the unit. The unit uses a routing table
to determine how to send any outbound IP frame. Each entry in the routing table tells the unit how to send a frame
whose destination address matches a rule in the routing table. Routing table entries are examined from most-
restrictive to least-restrictive, so the default routing table entry is the last entry in the table since it is the least
restrictive. It is the catch-all route: it tells the unit how to send a frame when it doesn't know how else to send it. The
only routes on the unit are network interface routes, any static routes you configure, and the default route. Network
interface routes tell the unit how to send a frame bound for a machine on one of the unit's local networks (subnets).
These routes are automatically configured when you configure the address of a network interface. If an outbound
frame is destined for a machine off all local networks then it is sent according to what the default route specifies. The
default route specifies the default router to use for these frames.
Each network interface has a router setting which you can configure; this is the machine on that interface to which
frames will be sent if they do not route to the local network of that interface. However the unit uses only one of those
configured routers at a time - - the default router setting specifies which router the unit will use at a time. As you
configure router settings the unit will choose a default router for you. This is available for you to see (and override) via
this net.default.router setting. The values you may choose for this setting (i.e., router addresses) are:
•
the set of routers which you have specified for Ethernet
•
interface peer, if you have ADSL hardware installed, represented as "DSL"
•
that which is determined by dynamic network interfaces, represented as "DYNAMIC".
DYNAMIC is always a possible value for the default router. It simply means that the default router is set
only
according to the default routing rule of any dynamic network interfaces that may be up, such as PPP via the POTS
modem or PPP via the Wireless modem. The rule for POTS modem PPP is that whenever that interface is up, it is
always the default route and overrides any other default route. The rule for Wireless modem PPP is that it is the
default route if the
net.wireless.defaultrouteenable
setting is enabled. (If it's disabled then the default route
will not be set when the default router is "DYNAMIC".) If the default router is set to anything besides "DYNAMIC", then
the default router will be either that (e.g., an Ethernet router)
or
that which is determined by the rules of the dynamic
network interfaces. In other words, DYNAMIC default router means the default router will be whatever POTS/Wireless
modem PPP decides when it is running, and there will be no default router when POTS/Wireless modem PPP is not
running (or when Wireless PPP is running but
net.wireless.defaultrouteenable
is off). Any other value for
the default router means that the default router will be that value (e.g., an Ethernet router), unless POTS/Wireless
modem PPP may be running and thus may override the default route. When POTS/Wireless modem PPP stops and
the default router is not set to DYNAMIC, then the default router will revert to the value of the default router setting.
The default router setting is special in that its set of allowed values (the routers for the various network interfaces) are
determined at runtime.
Values
Values are dotted-quads and must be in the set of routers configured with
net.eth.router
or they are the special
values "DSL" (when ADSL hardware is installed) and "DYNAMIC".
Key syntax
net.default.router
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