W&T Com-Server++ - Application Example

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W&T Mode SLIP router
21�1�4 Application example
Connecting two IP networks over serial cable
In SLIP router mode paired use of two Com-Servers allows two
IP/Ethernet networks to be connected over a serial RS232/422
cable. The prerequisite is that the two networks must belong
to different IP networks.
The gateway in the TCP/IP stacks of the computer must un-
der some conditions be configured to the IP address of the
respective Com-Server. If there are additional routers in the
network and these are capable of RIP protocol (Routing Infor-
mation Protocol), the routing will work without explicit confi-
guration of the gateway address.
The serial transmission parameters for both Com-Servers
must be identical. Only hardware handshake may be used for
flow control. The use of software handshake is not possible
due to the Xon and Xoff characters which the Com-Servers
process.
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The maximum serial transmission speed is 230.400
baud. Transmission of the entire Ethernet-side band-
width is not possible.
The following sketch shows a sample configuration for paired
use of Com-Servers as SLIP router
RS232
RS422
Ethernet 1:
172.16.210.0
Subnet mask:
255.255.255.0
Ethernet 2:
172.16.111.0
Subnet mask:
255.255.255.0
Configuration Com-Server 1:
IP address: 172.16.210.100
Subnet mask: 255.255.255.0
Slip Net Address: 172.16.111.0
Slip-Net Routing: 1
Configuration Com-Server 2:
IP address: 172.16.111.100
Subnet mask: 255.255.255.0
Slip Net Address: 172.16.210.0
Slip-Net Routing: 1
Com Server
1
Com Server
2