Here's a picture (aren't they worth a 1000 words...)
PHP:
# The Setup:
# """"""""""
# Computer IPs Gateway
# ---------- ------------------------------------------ ------------
# PCS 192.168.254.1
# DB 192.168.254.2 192.168.50.50 192.168.50.1
# Linksys 192.168.50.1 123.x.x.x 123.x.x.y
#
# 192.168.254.0/24 PLC1 Subnet
# 10.10.10.0/24 PCS2 Subnet
# 192.168.50.0/24 LAN Subnet
# 123.x.x.0/24 ISP Subnet
#
# The PCS computer has one network card. It is on a subnet with various PLC
# devices. All IPs on this subnet are statically assigned.
#
# The DB computer has two network cards. One on the PLC1 subnet, the other
# on the office LAN subnet. It has the IPEnableRouter=1 regedit applied.
#
# The Linksys router is connected to the LAN subnet. Its WAN port is
# connected to the DSL modem supplied by the ISP. It assigns IPs to the LAN
# subnet via DHCP.
#
# The Question:
# """""""""""""
# What additional settings are required to allow the PLC1 subnet access to
# the internet?
#
# Devices on the PLC subnet must be able to send email alerts.
#
# The answer likely lies in a few simple route table entries. I think the
# proverbial forest is hiding the trees. I can't seem to get it working.
#
# On the PCS computer I tried:
#
# route -p add 192.168.50.0 mask 255.255.255.0 192.168.254.2
#
# Which allows ping 192.168.50.50 to work, but the rest of the subnet is
# inaccessible. Suggestions would be appreciated.
#
# I'm guessing there are entries also required on the DB computer.
#
# Thanks in advance to the community for any help offered.
#
# Dave
#
# PCS Computer Route Table:
# """""""""""""""""""""""""
# ===========================================================================
# 0x1 ........................... MS TCP Loopback interface
# 0x2 ...00 21 9b 87 ed a6 ...... Intel(R) Gigabit
# ===========================================================================
# Network Destination Netmask Gateway Interface Metric
# 0.0.0.0 0.0.0.0 192.168.254.2 192.168.254.1 20
# 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
# 192.168.50.0 255.255.255.0 192.168.254.2 192.168.254.1 1
# 192.168.254.0 255.255.255.0 192.168.254.1 192.168.254.1 20
# 192.168.254.1 255.255.255.255 127.0.0.1 127.0.0.1 20
# 192.168.254.255 255.255.255.255 192.168.254.1 192.168.254.1 20
# 224.0.0.0 240.0.0.0 192.168.254.1 192.168.254.1 20
# 255.255.255.255 255.255.255.255 192.168.254.1 192.168.254.1 1
# Default Gateway: 192.168.254.2
# ===========================================================================
# Persistent Routes:
# Network Address Netmask Gateway Address Metric
# 192.168.50.0 255.255.255.0 192.168.254.2 1
#
# Windows IP Configuration Ethernet adapter PLC:
# Primary Dns Suffix : Description . . : Intel(R) Gigabit
# Node Type . . . . . : Unknown Dhcp Enabled. . : No
# IP Routing Enabled. : No IP Address. . . : 192.168.254.1
# WINS Proxy Enabled. : No Subnet Mask . . : 255.255.255.0
# Default Gateway : 192.168.254.2
#
# DB Computer Route Table:
# """"""""""""""""""""""""
# ===========================================================================
# 0x1 ........................... MS TCP Loopback interface
# 0x2 ...00 17 3f ce c0 5f ...... Realtek RTL8139
# 0x3 ...00 21 9b 87 ed 84 ...... Intel(R) Gigabit
# ===========================================================================
# Network Destination Netmask Gateway Interface Metric
# 0.0.0.0 0.0.0.0 192.168.50.1 192.168.50.50 20
# 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
# 192.168.50.0 255.255.255.0 192.168.50.50 192.168.50.50 20
# 192.168.50.50 255.255.255.255 127.0.0.1 127.0.0.1 20
# 192.168.50.255 255.255.255.255 192.168.50.50 192.168.50.50 20
# 192.168.254.0 255.255.255.0 192.168.254.2 192.168.254.2 20
# 192.168.254.2 255.255.255.255 127.0.0.1 127.0.0.1 20
# 192.168.254.255 255.255.255.255 192.168.254.2 192.168.254.2 20
# 224.0.0.0 240.0.0.0 192.168.50.50 192.168.50.50 20
# 224.0.0.0 240.0.0.0 192.168.254.2 192.168.254.2 20
# 255.255.255.255 255.255.255.255 192.168.50.50 192.168.50.50 1
# 255.255.255.255 255.255.255.255 192.168.254.2 192.168.254.2 1
# Default Gateway: 192.168.50.1
# ===========================================================================
# Persistent Routes:
# None
#
# Windows IP Configuration
# Primary Dns Suffix :
# Node Type . . . . . : Unknown
# IP Routing Enabled. : Yes
# WINS Proxy Enabled. : No
#
# Ethernet adapter LAN: Ethernet adapter PLC:
# Description . . . . : Realtek RTL8139 Description . . : Intel(R) Gigabit
# Dhcp Enabled. . . . : Yes Dhcp Enabled. . : No
# Autoconfig Enabled : Yes IP Address. . . : 192.168.254.2
# IP Address. . . . . : 192.168.50.50 Subnet Mask . . : 255.255.255.0
# Subnet Mask . . . . : 255.255.255.0 Default Gateway :
# Default Gateway . . : 192.168.50.1
# DHCP Server . . . . : 192.168.50.1
# DNS Servers . . . . : 142.x.x.x
# 142.x.x.y
#(excuse the PHP box - its the only way I could get the formatting to take)
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