eWON General Reference Guide - Esco Drives & Automation

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General Reference GuideeWON ConfigurationFigure 47: eWON PPP Router logon screen3.3.4.3.5.1 Static routesBefore the firmware 5.2, it was only possible to configure a default gateway to reach a given destination node when not located on the eWON'sphysical network.This feature adds the ability to configure 3 additional entries in eWON's routing tables (static routes).The eWON will forward packets using these routing entries when the IP packet destination matches one of the routing destination entries. Thedefault gateway if specified will only be used when no routing entry matches the destination.ControlDescriptionStatic routes tableDestination & MaskGatewayHopsClear (button)The destination IP address and the mask represent a range of addresses that must be routedthrough a specific gateway.ex: dest=192.168.1.0 & mask=255.255.255.0 correspond to the range of address between192.168.1.0 and 192.168.1.255This is the IP address of the gateway that must be used to route the range of address definedby Destination/Mask.Important: the Gateway address must be in the IP range of the eWON interface.In other words, the Gateway must be accessible by the eWON.For example if the IP address is 10.0.0.53/255.255.255.0, the gateway can be 10.0.0.254, butit CANNOT be 192.168.1.1.This is the number of hops to reach the destination using the given route. This parameter willdefine the priority of the routes. The eWON local routes (routes that do not require theemission of a packet through an interface) have a 0 hop metric. A route where the destinationcan be reached through the interface has a 1 hop metric.The higher the metric is, the lower the route's priority will be.The clear button can be used to invalidate the route entry content and remove the route.Important: The route configuration is applied immediately when the update button is pushed. It is not required to reboot the eWONto apply the routes modification.note: The default gateway is NOT defined using these configuration variables (Ethernet Gateway is used instead).RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 57
General Reference GuideeWON Configuration3.3.4.3.6 Proxy3.3.4.3.6.1 Why a proxy feature?Since firmware 5.2, the eWON has a built-in ProxyServer.The Proxy feature is similar to the transparent forwarding, with some advantages and some drawbacks.To be precise, it is not exactly equivalent to the transparent forwarding that forwards all the ports (except the 81), but more like a “port forwarding”feature that would forward some ports.The main advantage of the proxy implementation is that the "proxy's destination device" must NOT define the eWON as its gateway.3.3.4.3.6.2 Comments on the proxy feature• OverheadThere is an important difference between a forwarded packet and a proxied packet . When the packet is forwarded, it is modified at a very lowlevel of the stack, then it is immediately resent without any further interpretation, manipulation or storage.When the packet is proxied, the stack must first maintain storage for the proxied sockets, then every packet must walk the stack all way up tothe proxy application, then all the way down to be resent.This means an additional load for the system.• Proxied ports must be known and configuredIn “Forwarding” mode all ports are forwarded, there is no need to configure anything.In Proxied mode, the user must know what port(s) he wants to forward and what protocol (UDP,TCP, FTP) will flow on the port.• More intrusive contentAs said before in “Forwarding” mode, the packet is resent “as received”. If it contains 4 bytes, 4 bytes are resent. This is not true in the proxymode as the received data are (at least may be) re-aggregated at the proxy level.Example: if the client sends a 4 bytes packet followed by a 2 bytes packet, then the proxy can resend a 6 bytes packet to the "proxy'sdestination device". From a TCP point of view, there is no difference, but from a behavior point of view, there is a slight difference.One must check what protocol are considered here with the "proxy's destination device" and check if there is a chance that the proxy maydisturb the client-"proxy's destination device" discussion.3.3.4.3.6.3 Configuration.Figure 48: Proxy configuration pageRG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 58
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