However, the Cisco router can ping all hosts including my internet, and any Linksys hosts are able to ping my static host off VLAN1. I am using only one static host off VLAN1 which I am able to ping the Linksys gateway, but I cannot ping Linksys hosts or my internet address. Password somestrongpassword DOWNLOAD ARTICLE AS PDF FILEĪlright I am starting from scratch. ! Configure static NAT for port redirection Traffic that comes towards our WAN public address 100.100.100.1 on port 80 will be redirected by the router to the internal Web Server at address 192.168.1.10 on port 80. To do this we must configure a static NAT with port redirection. Here the WAN address is static and we have also an internal Web Server for which we need to allow HTTP access from Internet. ! This is the WAN interface with static IP The only difference from the configuration above is on the WAN interface and on default route: ![]() This is the same configuration as scenario 1 except that the WAN IP address is static and also the default gateway of our ISP is known. Ip nat inside source list 1 interface fastethernet4 overloadĪccess-list 1 permit 192.168.1.0 0.0.0.255 All internal hosts will be nated on the WAN interface ! This is the WAN interface getting address via DHCP from the ISP ! Interfaces FE0 to FE3 are Layer 2 interfaces ! This is the LAN facing interface of the 800 router. ! Configure the DHCP pool to assign addresses to internal hosts The following is the basic configuration needed for the simple scenario above. The router performs a static Port NAT (port redirection) to forward traffic from Internet towards the internal Web Server. Scenario 3: WAN IP address of router is static.LAN IP addresses assigned dynamically from the router. Scenario 2: WAN IP address of router is static.LAN IP addresses assigned dynamically from the router to the internal PCs. Scenario 1: WAN IP address of router is assigned dynamically by the ISP. ![]() I will describe three basic scenarios which are frequently encountered in real networks. On the other hand, the WAN interface (FE4) is a normal Layer3 router port, which means you can assign an IP address directly on the interface (“ interface FastEthernet4”). ![]() The IP address for the LAN-facing side of the router is assigned under “ interface Vlan1”. ![]() This means that you can not assign an IP address directly to the LAN interfaces. Something to have in mind for all 800 series routers, the four LAN interfaces (FE0 up to FE3) are Layer2 switch interfaces that are assigned by default to Vlan1. I will use a model with an Ethernet WAN interface (such as 851, 861, 871, etc) since those models are the most popular. In this post I will describe a basic configuration scenario for connecting a Cisco 800 router for Internet access. Also, all models have the option of a WiFi Radio interface (the model number ends with a “ W”, e.g 851W, 857W, 861W etc). The other models have an xDSL type WAN port (i.e ADSL, G.SHDL, VDSL2). All models that end with “ 1” in the model number (i.e 851, 861, 871, 881, 891) have a 10/100 Fast Ethernet interface as a WAN port. The main difference of each model is the WAN interface. They are “fixed hardware configuration” devices, meaning that they don’t have any plug-in hardware slots for inserting additional interfaces to the device (all the interfaces are fixed).Īll the 800 series models come with a 4-port 10/100 managed switch used for connecting the internal LAN computers, and with an IOS software that supports security features including the Firewall set. The Cisco 800 series routers are part of the “Branch Office” category, used mainly for SOHO purposes or for connecting remote branch offices to a central location.
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