Youâve graduated from setting up that new wireless router and are ready for your next adventure setting up a firewall. Gulp. We know, seems really intimidating. But breathe easy, because weâve broken it down to 6 simple steps that should help you on your way to network-security nirvana. And off we go⊠Step 2 Architect firewall zones and IP addresses No heavy lifting required. To best protect your networkâs assets, you should first identify them. Plan out a structure where assets are grouped based on business and application need similar sensitivity level and function, and combined into networks or zones. Donât take the easy way out and make it all one flat network. Easy for you is easy for attackers! All your servers that provide web-based services email, VPN should be organized into a dedicated zone that limits inbound traffic from the internetâoften called a demilitarized zone, or DMZ. Alternatively, servers that are not accessed directly from the internet should be placed in internal server zones. These zones usually include database servers, workstations, and any point of sale POS or voice over internet protocol VoIP devices. If you are using IP version 4, internal IP addresses should be used for all your internal networks. Network address translation NAT must be configured to allow internal devices to communicate on the internet when necessary. After you have designed your network zone structure and established the corresponding IP address scheme, you are ready to create your firewall zones and assign them to your firewall interfaces or sub-interfaces. As you build out your network infrastructure, switches that support virtual LANs VLANs should be used to maintain level-2 separation between the networks. Step 3 Configure access control lists Itâs your party, invite who you want. Once network zones are established and assigned to interfaces, you will start with creating firewall rules called access control lists, or ACLs. ACLs determine which traffic needs permission to flow into and out of each zone. ACLs are the building blocks of who can talk to what and block the rest. Applied to each firewall interface or sub-interface, your ACLs should be made specific as possible to the exact source and/or destination IP addresses and port numbers whenever possible. To filter out unapproved traffic, create a âdeny allâ rule at the end of every ACL. Next, apply both inbound and outbound ACLs to each interface. If possible, disable your firewall administration interfaces from public access. Remember, be as detailed as possible in this phase; not only test out that your applications are working as intended, but also make sure to test out what should not be allowed. Make sure to look into the firewalls ability to control next generation level flows; can it block traffic based on web categories? Can you turn on advanced scanning of files? Does it contain some level of IPS functionality. You paid for these advanced features, so donât forget to take those "next steps" Step 4 Configure your other firewall services and logging Your non-vinyl record collection. If desired, enable your firewall to act as a dynamic host configuration protocol DHCP server, network time protocol NTP server, intrusion prevention system IPS, etc. Disable any services you donât intend to use. To fulfill PCI DSS Payment Card Industry Data Security Standard requirements, configure your firewall to report to your logging server, and make sure that enough detail is included to satisfy requirement through of the PCI DSS. Step 5 Test your firewall configuration Donât worry, itâs an open-book test. First, verify that your firewall is blocking traffic that should be blocked according to your ACL configurations. This should include both vulnerability scanning and penetration testing. Be sure to keep a secure backup of your firewall configuration in case of any failures. If everything checks out, your firewall is ready for production. TEST TEST TEST the process of reverting back to a configuration. Before making any changes, document and test your recovering procedure. Step 6 Firewall management All fires need stoking. Once your firewall is configured and running, you will need to maintain it so it functions optimally. Be sure to update firmware, monitor logs, perform vulnerability scans, and review your configuration rules every six months.
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Table Of Contents Configuring a Simple Firewall Configure Access Lists Configure Inspection Rules Apply Access Lists and Inspection Rules to Interfaces Configuration Example Configuring a Simple Firewall The Cisco 850 and Cisco 870 series routers support network traffic filtering by means of access lists. The routers also support packet inspection and dynamic temporary access lists by means of Context-Based Access Control CBAC. Basic traffic filtering is limited to configured access list implementations that examine packets at the network layer or, at most, the transport layer, permitting or denying the passage of each packet through the firewall. However, the use of inspection rules in CBAC allows the creation and use of dynamic temporary access lists. These dynamic lists allow temporary openings in the configured access lists at firewall interfaces. These openings are created when traffic for a specified user session exits the internal network through the firewall. The openings allow returning traffic for the specified session that would normally be blocked back through the firewall. See the Cisco IOS Security Configuration Guide, Release for more detailed information on traffic filtering and firewalls. Figure 8-1 shows a network deployment using PPPoE or PPPoA with NAT and a firewall. Figure 8-1 Router with Firewall Configured 1 Multiple networked devicesâDesktops, laptop PCs, switches 2 Fast Ethernet LAN interface the inside interface for NAT 3 PPPoE or PPPoA client and firewall implementationâCisco 851/871 or Cisco 857/876/877/878 series access router, respectively 4 Point at which NAT occurs 5 Protected network 6 Unprotected network 7 Fast Ethernet or ATM WAN interface the outside interface for NAT In the configuration example that follows, the firewall is applied to the outside WAN interface FE4 on the Cisco 851 or Cisco 871 and protects the Fast Ethernet LAN on FE0 by filtering and inspecting all traffic entering the router on the Fast Ethernet WAN interface FE4. Note that in this example, the network traffic originating from the corporate network, network address is considered safe traffic and is not filtered. Configuration Tasks Perform the following tasks to configure this network scenario âąConfigure Access Lists âąConfigure Inspection Rules âąApply Access Lists and Inspection Rules to Interfaces A configuration example that shows the results of these configuration tasks is provided in the "Configuration Example" section. Note The procedures in this chapter assume that you have already configured basic router features as well as PPPoE or PPPoA with NAT. If you have not performed these configurations tasks, see Chapter 1 "Basic Router Configuration," Chapter 3 "Configuring PPP over Ethernet with NAT," and Chapter 4 "Configuring PPP over ATM with NAT," as appropriate for your router. You may have also configured DHCP, VLANs, and secure tunnels. Configure Access Lists Perform these steps to create access lists for use by the firewall, beginning in global configuration mode Command Purpose Step 1 access-list access-list-number {deny permit} protocol source source-wildcard [operator [port]] destination Example Routerconfig access-list 103 deny ip any any Routerconfig access-list 103 permit host eq isakmp any Routerconfig Creates an access list which prevents Internet- initiated traffic from reaching the local inside network of the router, and which compares source and destination ports. See the Cisco IOS IP Command Reference, Volume 1 of 4 Addressing and Services for details about this command. Configure Inspection Rules Perform these steps to configure firewall inspection rules for all TCP and UDP traffic, as well as specific application protocols as defined by the security policy, beginning in global configuration mode Command or Action Purpose Step 1 ip inspect name inspection-name protocol Example Routerconfig ip inspect name firewall tcp Routerconfig Defines an inspection rule for a particular protocol. Step 2 ip inspect name inspection-name protocol Example Routerconfig ip inspect name firewall rtsp Routerconfig ip inspect name firewall h323 Routerconfig ip inspect name firewall netshow Routerconfig ip inspect name firewall ftp Routerconfig ip inspect name firewall sqlnet Routerconfig Repeat this command for each inspection rule that you wish to use. Apply Access Lists and Inspection Rules to Interfaces Perform these steps to apply the ACLs and inspection rules to the network interfaces, beginning in global configuration mode Command Purpose Step 1 interface type number Example Routerconfig interface vlan 1 Routerconfig-if Enters interface configuration mode for the inside network interface on your router. Step 2 ip inspect inspection-name {in out} Example Routerconfig-if ip inspect firewall in Routerconfig-if Assigns the set of firewall inspection rules to the inside interface on the router. Step 3 exit Example Routerconfig-if exit Routerconfig Returns to global configuration mode. Step 4 interface type number Example Routerconfig interface fastethernet 4 Routerconfig-if Enters interface configuration mode for the outside network interface on your router. Step 5 ip access-group {access-list-number access-list-name}{in out} Example Routerconfig-if ip access-group 103 in Routerconfig-if Assigns the defined ACLs to the outside interface on the router. Step 6 exit Example Routerconfig-if exit Routerconfig Returns to global configuration mode. Configuration Example A telecommuter is granted secure access to a corporate network, using IPSec tunneling. Security to the home network is accomplished through firewall inspection. The protocols that are allowed are all TCP, UDP, RTSP, NetShow, FTP, and SQLNet. There are no servers on the home network; therefore, no traffic is allowed that is initiated from outside. IPSec tunneling secures the connection from the home LAN to the corporate network. Like the Internet Firewall Policy, HTTP need not be specified because Java blocking is not necessary. Specifying TCP inspection allows for single-channel protocols such as Telnet and HTTP. UDP is specified for DNS. The following configuration example shows a portion of the configuration file for the simple firewall scenario described in the preceding sections. ! Firewall inspection is set up for all TCP and UDP traffic as well as ! specific application protocols as defined by the security policy. ip inspect name firewall tcp ip inspect name firewall udp ip inspect name firewall rtsp ip inspect name firewall h323 ip inspect name firewall netshow ip inspect name firewall ftp ip inspect name firewall sqlnet interface vlan 1 ! This is the internal home network. ip inspect firewall in ! Inspection rules for the internal interface. interface fastethernet 4 ! FE4 is the outside or Internet-exposed interface. ! acl 103 permits IPSec traffic from the corp. router ! as well as denies Internet-initiated traffic inbound. ! acl 103 defines traffic allowed from the peer for the IPSec tunnel. access-list 103 permit udp host any eq isakmp access-list 103 permit udp host eq isakmp any access-list 103 permit esp host any ! Allow ICMP for debugging but should be disabled because of security implications. access-list 103 permit icmp any any access-list 103 deny ip any any ! Prevents Internet-initiated traffic inbound. ! acl 105 matches addresses for the ipsec tunnel to or from the corporate network. access-list 105 permit ipSetelahsudah mempersiapkan alat dan bahannya, mari kita lihat cara memebangun jaringan LAN melalui simulasi di Cisco Packet Tracer. Pertama kita buka aplikasi Cisco Packet Tracer, kemudian jika sudah maka pilih router untuk mengawali sebuah jaringan. Setelah router sudah di tambahkan, maka langkah selanjutnya tambahkan switch. Before you get started Check your Internet connection If you don't have a good internet connection, the router setup experience will be frustrating. The simplest method is to connect a computer to the modem or gateway device supplied by your Internet service provider ISP. If your computer detects an Internet connection, you're ready to set up the router. Gather documentation Here's another "seems obvious" stepâbut one that will save you aggravation when you're in the middle of setup. Keep an eye out for stickers or slips of paper that might include important setup information, like the router's default username and password. Check for an app Many router manufacturers provide mobile apps or web dashboard that can be used for both setup and management. With a smartphone app, you may not have to connect the router to a computer to configure it. Check the documentation that came with your router to see if an app is available. Install and extend antennas If the router has antennas and they're separate from the router box, you'll need to install them. In addition, you should extend the antennas before beginning the setup process. Videos Router setup steps Step 1 Decide where to place the router The best place for a wireless business router is in an open area of the workplace, as you'll benefit from even coverage. However, sometimes it's not easy to find a space out in the open because you must connect the router to a broadband gateway from your ISP Internet service provider, which is usually attached to a cable near an outside wall. Step 2 Connect to the Internet Attach the router to a cable - or choose a mesh router To solve the "long-distance" problem when connecting a router, you can use a CAT5e or CAT6 cable to connect the router to the ISP gateway's Ethernet port. Another option is to run Ethernet cables through the walls of your office to the chosen central location for the router. Yet another option is to install a mesh network with a router. A mesh network allows you to place multiple Wi-Fi transmitters across your home or office, all on one network. Unlike extenders, which can be used with any wireless router, mesh networks require a router with this capability built-in. No matter which option you choose, you'll use a basic Ethernet cable, plugged into the router's wide-area network WAN or Internet port. The Internet port is typically set apart from other ports by a different color. Check the router's LED lights Your router's LED lights tell you if you've successfully made an active Internet connection. If you don't see lights confirming such a connection, make sure you've plugged the cable into the correct port. Test the connection with a device Confirm that your router has a working connection by plugging a laptop computer into one of the device ports on the back of the router. If all goes well, you should be able to begin a wired connection, just as you did when confirming an active Internet connection. Step 3 Configure the wireless router gateway In some cases, ISPs offer customers gateways with built-in routers. In most cases, these combined devices are not built for business environments, nor do they have extra ports, security, and other options that allow you to add services and expand networks as the business grows. If you have a gateway with an integrated router, you'll have to configure the gateway to disable the router and pass the WAN IP addressâthe unique Internet protocol address that the Internet provider assigns to your accountâand all network traïŹc through to your new router. If you donât take this step, you may run into conflicts that prevent devices from working properly. You may need to contact your ISP for help with this step. Step 4 Connect gateway to router First, turn off the gateway. If there is already an Ethernet cable plugged into the gateway's local-area network LAN port, unplug the cable and plug it into your router's WAN port. Turn the gateway back on and wait a few minutes for it to boot up. Plug in the router's power supply and turn it on, again waiting a few minutes. Step 5 Use app or web dashboard The easiest way to continue with router setup is to use a mobile app if the router maker provided one. If there is no app, or you'd rather use the router's web-based dashboard, connect the router to a computer via an Ethernet cable. You might find the router's IP address printed on the back of device itself; if not, type a common router address, into the browser search bar. Step 6 Create a username and password To configure the router, you'll need to log in, using its default admin name and password. You can usually find this information printed on the router itself, or in an accompanying user manual. Next, enter the required credentials. Once you're in, you should immediately create a new username and password. The defaults are usually something like "admin" and "password1234," which are obviously not secureâso make sure to change them at the first opportunity. Step 7 Update the router's firmware Your router may need an update of the "firmware," or software that operates it. Update it as soon as possible, since the new firmware might fix bugs or offer new security protections. Some routers may download new firmware automatically, but many do not. You may need to check for updates through the app or the browser interface. Step 8 Create a Wi-Fi password Just as most routers come with preassigned admin usernames and passwords, most also come with preset Wi-Fi usernames and passwords. Youâll likely be prompted to change the Wi-Fi username and password, but even if you don't see such a prompt, plan to do so quickly. Step 9 Use auto-configuration tools where possible If your router is equipped with auto-install features, rely on them to help complete setup. For example, you should be able to use auto-configuration to manage IP addresses with the Dynamic Host Configuration Protocol DHCP, which automatically assigns IP addresses to devices. You can always change these addresses later. Step 10 Set up security Many router manufactures provide security functionality to safeguard network and user privacy. You can login into the web dashboard and enabling added security features such as firewall, web filtering, and access controls to protect yourself from malicious traffic. You can also set up virtual private networks VPNs for privacy. Shop for routers
Tapijika jumlah VPN Client-nya banyak maka cara inilah yang tepat untuk kita lakukan. Caranya : Klik menu IP - POOL. Keempat : Dari menu IP - Pool, selanjutnya buat New IP Pool. Misalnya kita alokasikan IP Address : - 192.168.88.20 dan kita berikan nama vpn-client. Kelima : Selanjutnya kita lihat IP Pool yang kita buat telah
ï»żImprove Article Save Article Like Article ReadDiscussImprove Article Save Article Like Article Prerequisite FirewallA firewall is a hardware or software network security device that monitors all incoming and outgoing traffic based on a defined set of security rules, it accepts, rejects, or drops that specific traffic. Accept Allow Block traffic but respond with âreachable errorâ.Drop Block unanswered traffic firewall establishes a barrier between secure internal networks and untrusted external networks, such as the to Configure and Verify Firewall in Cisco Packet TracerStep 1 First, open the Cisco packet tracer desktop and select the devices given below Addressing Table AddressSubnet create a network topology as shown below the an Automatic connecting cable to connect the devices with 2 Configure the PCs hosts and server with IPv4 address and Subnet Mask according to the IP addressing table given assign an IP address in PC0, click on go to desktop and then IP configuration and there you will IPv4 IPv4 address and subnet the same procedure with the serverAssigning an IP address using the ipconfig command, or we can also assign an IP address with the help of a to the command terminal of the type iPConfig if neededExample ipconfig the same procedure with other PCs to configure them 3 Configuring the firewall in a server and blocking packets and allowing web on server0 then go to the click on firewall on the Deny the ICMP protocol and set remote IP to and Remote wildcard mask to allow the IP protocol and set remote IP to and Remote wildcard mask to add 4 Verifying the network by pinging the IP address of any will use the ping command to do click on PC2 then Go to the command type ping .We will ping the IP address of the we can see in the below image we are getting no replies which means the packets are the web browser by entering the IP address in the on PC2 and go to desktop then web Updated 30 Jun, 2022Like Article Save Article NBQ9A.cara setting firewall cisco
