Find cisco catalyst no ip address

You can connect WAN interfaces either by using straight polarity connectors or reversed polarity connectors.


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Enters the configuration mode for a Gigabit Ethernet interface on the router. Router config-if ip address Sets the IP address and subnet mask for the specified GE interface.

CCNA // change ip address cisco router command line // configure ip address cisco switch

Router config-if no shutdown. Enables the GE interface, changing its state from administratively down to administratively up. Router config-if exit. Exits configuration mode for the GE interface and returns to global configuration mode. The loopback interface acts as a placeholder for the static IP address and provides default routing information.

Catalyst 4500 Series Switch Software Configuration Guide, Release IOS XE 3.3.0SG and IOS 15.1(1)SG

To configure a loopback interface, follow these steps, beginning in global configuration mode. Enters configuration mode for the loopback interface. Sets the IP address and subnet mask for the loopback interface. Exits configuration mode for the loopback interface and returns to global configuration mode. The loopback interface in this sample configuration is used to support Network Address Translation NAT on the virtual-template interface. This configuration example shows the loopback interface configured on the gigabit ethernet interface with an IP address of The loopback interface points back to virtual-template1, which has a negotiated IP address.

To verify that you have properly configured the loopback interface, enter the show interface loopback command as shown in the following example. You can lso verify the loopback interface by using the ping command as shown in the following example.

Catalyst 3750-X and 3560-X Switch Software Configuration Guide, Release 12.2(55)SE

To configure parameters to control access to the router, perform the following steps. Enters line configuration mode, and specifies the type of line. Specifies a unique password for the console terminal line. Enables password verification at the terminal login session. Sets the interval that the EXEC command interpreter waits until user input is detected. The default is 10 minutes. You can also optionally add seconds to the interval value.

Specifies a virtual terminal for remote console access. Specifies a unique password for the virtual terminal line. Enables password verifiation at the virtual terminal login session. Exits line configuration mode, and returns to privileged EXEC mode. Static routes provide fixed routing paths through the network.

They are manually configured on the router. If the network topology changes, the static route must be updated with a new route. Static routes are private routes unless they are redistributed by a routing protocol. To configure static routes, perform these steps in global configuration mode. Router config ip route Exits router configuration mode, and enters privileged EXEC mode. The term inside in a Network Address Translation NAT context refers to networks owned by an organization that must be translated. When NAT is configured, hosts within this network have addresses in one space known as the local address space.

These hosts appear to those outside the network as being in another space known as the global address space. Similarly, the term outside refers to those networks to which the stub network connects, and which are not under the control of an organization.

Prerequisites for Configuring the Cisco IOS DHCP Relay Agent

Also, hosts in outside networks can be subject to translation, and can thus have local and global addresses. NAT uses the following definitions:. Inside local address—An IP address that is assigned to a host on the inside network. Inside global address—A legitimate IP address assigned by the NIC or service provider that represents one or more inside local IP addresses to the outside world. Outside local address—The IP address of an outside host as it appears to the inside network.

Not necessarily a legitimate address, it is allocated from the address space that is routable on the inside. Outside global address—The IP address that is assigned to a host on the outside network by the owner of the host. The address is allocated from a globally routable address or network space. Inside Source Address Translation. Overloading of Inside Global Addresses. You can translate IP addresses into globally unique IP addresses when communicating outside of your network. You can configure inside source address translation of static or dynamic NAT as follows:.

Static translation establishes a one-to-one mapping between the inside local address and an inside global address. Static translation is useful when a host on the inside must be accessible by a fixed address from the outside. Dynamic translation establishes a mapping between an inside local address and a pool of global addresses. The following figure illustrates a device that is translating a source address inside a network to a source address outside the network.

The following process describes the inside source address translation, as shown in the preceding figure:. The first packet that the device receives from host Based on the NAT configuration, the following scenarios are possible:. If no translation entry exists, the device determines that the source address SA The device selects a legal, global address from the dynamic address pool, and creates a translation entry in the NAT table. This kind of translation entry is called a simple entry.


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  6. The device replaces the inside local source address of host Host B receives the packet and responds to host When the device receives the packet with the inside global IP address, it performs a NAT table lookup by using the inside global address as a key. It then translates the address to the inside local address of host Host The device performs Steps 2 to 5 for each packet that it receives. You can conserve addresses in the inside global address pool by allowing a device to use one global address for many local addresses.

    When overloading is configured, the device maintains enough information from higher-level protocols for example, TCP or UDP port numbers. This action translates the global address back to the correct local address. When multiple local addresses map to one global address, the TCP or UDP port numbers of each inside host distinguish between local addresses. The following figure illustrates a NAT operation when an inside global address represents multiple inside local addresses.

    The TCP port numbers act as differentiators. The device performs the following process in the overloading of inside global addresses, as shown in the preceding figure. Both Host B and Host C believe that they are communicating with a single host at address Whereas, they are actually communicating with different hosts; the port number is the differentiator. In fact, many inside hosts can share the inside global IP address by using many port numbers. Based on your NAT configuration the following scenarios are possible:. If no translation entry exists, the device determines that IP address If overloading is enabled and another translation is active, the device reuses the global address from that translation and saves enough information.

    This saved information can be used to translate the global address back, as an entry in the NAT table. This type of translation entry is called an extended entry. The device replaces inside local source address When the device receives the packet with the inside global IP address, it performs a NAT table lookup by using a protocol, the inside global address and port, and the outside address and port as keys.

    It translates the address to the inside local address The device performs Steps 2 to 5 for each packet it receives. Overlapping networks result when you assign an IP address to a device on your network. This device is already legally owned and assigned to a different device on the Internet or outside the network. The device intercepts the DNS reply, and translates the returned address if there is an overlap. That is, the resulting legal address resides illegally in the inside network. To translate the return address, the device creates a simple translation entry.

    This entry maps the overlapping address, If it is, the device translates the address as described in the following steps:. The device sets up the translation mapping of the inside local and global addresses to each other. It also sets up the translation mapping of the outside global and local addresses to each other. The device replaces the SA with the inside global address and replaces the DA with the outside global address. The device does a lookup, replaces the DA with the inside local address, and replaces the SA with the outside local address.

    Solved: use of no ip address command - Cisco Community

    Your organization may have multiple hosts that must communicate with a heavily used host. By using Network Address Translation NAT , you can establish a virtual host on the inside network that coordinates load sharing among real hosts. Destination addresses that match an access list are replaced with addresses from a rotary pool. Allocation is done on a round-robin basis and only when a new connection is opened from the outside to inside the network.

    Non-TCP traffic is passed untranslated unless other translations are configured. The following figure illustrates how TCP load distribution works. The device receives the connection request and creates a new translation, allocating the next real host The device replaces the destination address with the selected real host address and forwards the packet. The device receives the packet and performs a NAT table lookup by using the inside local address and port number.

    It also does a NAT table lookup by using the outside address and port number as keys. The device then translates the source address to the address of the virtual host and forwards the packet. The device will allocate IP address A public wireless LAN provides users of mobile computing devices with wireless connections to a public network, such as the Internet.

    Configuring the Switch IP Address and Default Gateway

    By configuring a device to support users with a static IP address, public wireless LAN providers extend their services to a greater number of users. NAT entries are created for static IP clients and a routable address is provided. RADIUS-enabled devices handle issues that are related to a server availability, retransmission, and timeouts rather than the transmission protocol. To deliver service to the user, RADIUS servers receive a user connection request, authenticate the user, and then return the configuration information necessary for the client.