Asentria SiteBoss 530 User Manual
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DSL Routing
DSL routing is used to make the unit route, and do network address translation (NAT) on, NAT-capable traffic
(TCP, UDP, and ICMP) from the unit's Ethernet ports to the unit's DSL peer, and hence on to the Internet. For
example, a PC that uses one of the unit's Ethernet addresses as its default router can browse the web via the
unit's DSL connection. The DSL interface is firewalled such that only traffic related to already-existing-outgoing
connections is allowed in.
Configuration
The following Setting Keys need to be configured:
net.dsl.startmode
Set this to AUTO to tell the unit to automatically raise the DSL interface upon boot. Set this to MANUAL to require
user intervention to raise the DSL interface, or to let a VPN (if it is configured to use DSL) raise the DSL interface
when the VPN needs to use DSL. Values are MANUAL or AUTO. Default setting is MANUAL.
net.default.router
This setting allows you to select the default router (gateway) for the unit. 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 this
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) must be in the set of routers which you have specified, or the special value, "DSL", which means that
the DSL interface peer is the default router. For DSL Routing, set
net.default.router
=DSL
.
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 at this time are network interface routes 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.
If you have configured only one router for all of your network interfaces then you don't have to worry about this
setting: the unit configures it for you and there is nothing you can override it with. The default router is engaged as
soon as it is configured.
net.dsl.routing.enable
Set this to ON to make the unit forward frames received on either Ethernet interface (and not addressed to the
unit) out the DSL interface. Frames are NAT-ed as they leave the DSL interface. Frames arriving on the DSL
interface not associated with existing connections are blocked (the unit is firewalled). Note that the unit's default
router must be set to DSL (
net.default.router
=DSL
) for DSL routing to work. Set this to OFF to make the
unit not do this. Values are: ON or OFF. Default is OFF.
net.dsl.override
Set this to a non-zero value to enable ADSL web configuration access on the TCP port specified by the value. Set
this to 0 to disable web configuration access. Values are:
0
to
65535
.
Default is 0.
net.dsl.cmd
This has the same behavior as
net.dsl.command
.
net.dsl.status
Upon read this returns 0, 1, 2 or 3. Refer to the
description above for further details.
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