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Chapter 16 Other settings
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Second, there must be no default gateway in the operating system (no default gateway
must be defined for any network adapter). This condition does not apply to the dial-up
line which is used for the Internet connection — this line will be configured in accordance
with information provided by the ISP.
If WinRoute receives a packet from the local network, it will compare it with the system
routing table. If the packets goes out to the Internet, no record will be found, since there
is no default route in the routing table. Under usual circumstances, the packet would
be dropped and a control message informing about unavailability of the target would
be sent to the sender. If no default route is available, WinRoute holds the packet in the
cache and dials the appropriate line if the demand dial function is enabled. This creates
an outgoing route in the routing table via which the packet will be sent.
To avoid undesired dialing of the line, line dialing is allowed by certain packet types
only. The line can be dialed only by UDP or TCP packets with the SYN flag (connection
attempts). Demand dialing is disabled for Microsoft Networks services (sharing of files
and printers, etc.).
Since this moment, the default route exists and other packets directed to the Internet
will be routed via a corresponding line. The line may be either disconnected manually or
automatically if idle for a certain time period. When the line is hung-up, the default route
is removed from the routing table. Any other packet directed to the Internet redials the
line.
Notes:
1. To ensure correct functionality of demand dialing there must be no default gateway
set at network adapters. If there is a default gateway at any interface, packets to the
Internet would be routed via this interface (no matter where it is actually connected
to) and WinRoute would not dial the line.
2. If multiple demand dial RAS lines are defined in WinRoute, the one that was defined
first will be used. WinRoute does not enable automatic selection of a line to be dialed.
3. Lines can be also dialed if this is defined by a static route in the routing table (refer
to chapter
16.1). If a static route via the dial-up is defined, the packet matching this
route will dial the line. This line will not be used as the default route — the Use
default gateway on remote network option in the dial-up definition will be ignored.
4. According to the factors that affect total time since receiving the request until the
line is dialed (i.e. line speed, time needed to dial the line, etc.) the client might
consider the destination server unavailable (if the timeout expires) before a success-
ful connection attempt. However, WinRoute always finishes dial attempts. In such
cases, simply repeat the request, i.e. with the Refresh button in your browser.