Configure ISDN Connectivity between Remote Sites

Transcription

1 Case Study 1 Configure ISDN Connectivity between Remote Sites Cisco Networking Academy Program CCNP 2: Remote Access v3.1

2 Objectives In this case study, the following concepts are covered: Asynchronous Dialup Connection AUX PPP (multilink and authentication) ISDN (PRI and BRI) Dialer Profiles Map Class 2-5 CCNP 2: Remote Access v3.1 Copyright 2003, Cisco Systems, Inc.

3 Scenario The Air Guitar Company wants to connect three remote sites via ISDN links. In addition they have asked that dialup access be enabled for remote users to access the Air Guitar network. Initial Configurations Physically connect the network devices according the network diagram. Be sure that the cables are connected to the appropriate Adtran ports as labeled in the diagram. The Air Guitar Company has decided to use the private address /8 network. Configure Fa0/0 interface of R1, R2, and R3 to belong to the 10.x.x.x /24 network. The x refers to the router number. For example, the Fa0/0 interface of R1 should be IP address /24, R2 should be , and R3 should be Configure all three routers to use the password cisco to support Telnet services and privilege EXEC mode. Configure all three routers with a local username and password database where the username will be the remote router names and the password cisco. For example, the R1 router would include username R2 password cisco. Copyright 2003, Cisco Systems, Inc. Case Study 1: Configure ISDN Connectivity between Remote Sites 3-5

4 Asynchronous Configure an asynchronous dialup connection on the AUX port of R1, so that Host A can dial up R1 to access the Air Guitar corporate network. Configure the asynchronous interface so that it will share the Fa0/0 IP address of R1. Configure PPP dedicated mode on R1. The EXEC prompt should not appear and the router will not be available for EXEC mode access unless the user Telnets from the host. Configure R1 to always assign Host A the IP address Configure a local database entry to authenticate Host A with the username HostA and password letmein. Configure the router to automatically discover the modem type and configure it. Configure Host A to dial to access the Air Guitar network. ISDN Configure ISDN PRI on R1. The ISDN switch type for the ISDN PRI connection is primary-ni. Configure the T1 controller on R1 to use esf framing, b8zs line coding, and set the T1 controller to use all timeslots. R1 belongs to the /29 subnet. Configure the first valid IP address to R1. Configure the PRI channel on R1 for Dial-on-Demand Routing (DDR) to establish a call to both R2 and R3. Be sure to correctly map the dialer string to the appropriate IP address. Configure the PRI channel on R1 to use PPP multilink. Configure ISDN BRI on R2 and R3 to use the SPID information from the network diagram. The ISDN switch type for the ISDN BRI connection is basic-ni. Configure a pair of dialer interfaces (Dialer 0 and Dialer 1) on R2 and R3 for Dial-on-Demand Routing (DDR) to establish a call to R1 (Dialer 0) or between both BRI interfaces (Dialer 1). Configure Dialer 0 on both R2 and R3 to connect to the PRI interface of R1 by calling Configure the R2 and R3 Dialer 0 interface so that they belong to the same subnet as R1, /29. All IP packets should be able to initiate an ISDN call. Configure Dialer 1 on both R2 and R3 to establish an ISDN connection between the two routers. 4-5 CCNP 2: Remote Access v3.1 Copyright 2003, Cisco Systems, Inc.

5 Configure the R2 and R3 dialer 1 interface so that they belong to the /30 VLSM subnet. All IP packets should be able to initiate an ISDN call. Configure R2 and R3 to aggregate both ISDN B-channels when incoming or outgoing traffic exceeds a threshold of 3. Create a map class on R2 and R3 that will aggressively disconnect the ISDN connection when the link is not used. Set the idle-timeout to 30 seconds, fastidle timer to 10 seconds, and carrier wait time to 25 seconds. Configure R1, R2 and R3 to secure the ISDN connections with PPP CHAP. Configure static routes on all routers so that each router knows how to reach its neighbor remote LAN. Test the ISDN connection. Ping the R2 and R3 dialer 0 interface from R1 and vice versa. If the pings fail, troubleshoot as necessary. Ping the R2 dialer 1 interface from R3. If the pings fail, troubleshoot as necessary. Check List R1 should query its local username and password database to authenticate remote login attempts. Host A should be able to reach the entire Air Guitar network after a successful asynchronous connection is established to R1. R1 should be able to initiate an ISDN DDR connection with R2 and R3. R2 and R3 should use an aggressive map class to timeout the ISDN connection. R2 and R3 should be able to initiate a DDR connection using dialer profiles with R1 and with each other. Copyright 2003, Cisco Systems, Inc. Case Study 1: Configure ISDN Connectivity between Remote Sites 5-5

6 Case Study 2 Configure ISDN Backup and VPN Connection Cisco Networking Academy Program CCNP 2: Remote Access v3.1

7 Objectives In this case study, the following concepts are covered: AAA authentication Multipoint Frame Relay with Sub-interfaces ISDN dial backup Floating Static Routes Dynamic NAT Multipoint VPN with NAT QoS- Class Based Weighted Fair Queuing 2-6 CCNP 2: Remote Access v3.1 Copyright 2003, Cisco Systems, Inc.

8 Scenario The Air Guitar Company wants ISDN backup for the primary Frame Relay Links. In addition they have asked for a multipoint VPN connection to R3. Initial Configurations Physically connect the network devices according the above diagram. Be sure that the cables are connected to the appropriate Adtran ports as labeled in the diagram. Configure the F0/0 interface on R1 and R2, as well as their respective hosts so that they belong to the 10.x.x.x/24 network. The x represents the router number. OR Substitute the x for the router number. Example: R1 F0/0 = /24. Be sure to configure the respective hosts on R1 and R2 to use the appropriate gateway IP. Configure Host B and the F0/0 interface on R3 so that they belongs to the /24 network. Configure R1 with a Loopback interface using the IP address /24. The loopback address will be used to simulate a connection to an external network. Configure all three routers using the privilege EXEC mode password cisco. Copyright 2003, Cisco Systems, Inc. Case Study 2: Configure ISDN Backup and VPN Connection 3-6

9 Configure all three routers with a local username and password database where the username will be the remote router name and password cisco. Example: username r1 password cisco. Configure AAA authentication on all routers to query the local username and password database. Frame Relay The Atlas is preconfigured with multiple PVCs. For the purposes of this lab, the PVC between R1 and R3 will be ignored. After setting the Frame Relay encapsulation on R2, issue the following command: no frame-relay inversearp ip 203. After setting the Frame Relay encapsulation on R3, issue the following command: no frame-relay inverse-arp ip 302. The commands will prevent automatic mapping for this unused PVC. Configure Frame Relay on all three routers so that R2 and R3 will become spokes and R1 will be the Frame Relay Hub. Configure sub-interfaces on R1 to directly connect to R2 and R3. Configure the Frame Relay connection between each Hub and Spoke so that R1 and R2 belong to the /30 subnet and that R1 and R3 belong to the /30 subnet. Configure default routes on R2 and R3 so that R1 will be the next hop router. Be sure to configure static routes on R1 to reach R2 connected LAN. Do not configure a static route on R1 to reach the R3 LAN. Use ping to verify connectivity between each router over the Frame Relay link. NAT Configure Dynamic NAT on R3 so that traffic sourced from its inside local address /24 will be translated with a global address of /24. Configure an access-list on R3 so that packets sourced from its inside local address will not be translated with NAT when destined for the R1 and R2 remote LANs. Traffic destined for any other destination will be translated with NAT. Be sure to configure a default route on R3 to use R1 as the next hop router to reach any destination networks. Configure a static route on R1 and R2 to reach the R3 inside local address /24. Ping the Lo0/0 interface on R1 from Host B. Use the appropriate show commands to verify that R3 has translated packets from its LAN with an inside global address. Ping Host A and Host C from Host B. Use the appropriate show commands to verify that R3 has not translated packets from its LAN with an inside global address. 4-6 CCNP 2: Remote Access v3.1 Copyright 2003, Cisco Systems, Inc.

10 ISDN Dial Backup Use the SPID information from the network diagram to configure ISDN BRI on R1 and R2. The ISDN switch type used for the ISDN BRI connection is basicni. Configure R1 and R2 to secure the ISDN dial up connection to use PPP CHAP. Be sure that the aaa authentication default is defined for PPP. Configure the BRI interface on R1 and R2 so that it belongs to the VLSM /30 network. Test the ISDN connection by initiating a DDR connection. Ping the BRI0/0 interface on R2 from R1. If the pings fail troubleshoot as necessary. Configure ISDN dialer backup on R1 to use the BRI interface to backup the primary Frame Relay interface. The backup line should come up 5 seconds after the primary link fails and go down 20 seconds after the primary link comes back up. IPSec Configure Hub and Spoke IPsec so that R2 will build an IPsec tunnel through R1 in order to reach R3. Configure a named access-list on all routers to define traffic from their respective LANs to be encrypted when traffic is destined for their neighboring remote LANs. Configure R1 and R2 so that traffic sourced from their FastEthernet LAN and destined for their respective neighboring remote LANs, is encrypted. Configure IPSec on R3 so that the inside local address will be encrypted and not be translated by NAT when traffic is destined for the R1 and R2 Ethernet networks. Packets destined for anywhere else will be translated with NAT. Configure the ISAKMP policy suite on R1 and R2 with the following parameters. Be sure to manually configure the same pre-shared key on both routers and to use pre-shared keys authentication. Configure the transform-set to use esp-des to build the IPSec security association. Be sure to configure and apply a crypto map to the defined parameters for IPSec protection on each routers s0/0 interface. To test your IPSec tunnel configuration enable the appropriate debug commands to monitor IPSec activity and ping Host C from Host B. QoS Configure class based weighted fair queuing (CBWFQ) on all three routers to guarantee 32 kbps of Frame Relay bandwidth usage for Telnet traffic from any source to any destination. Use the appropriate configurations to verify your QoS configurations. Copyright 2003, Cisco Systems, Inc. Case Study 2: Configure ISDN Backup and VPN Connection 5-6

11 Check List R1 should query its local username and password database to authenticate remote login attempts. R1 should be able to initiate an ISDN DDR connection with R2 and vice versa. The ISDN connection on R1 and R2 should be able to back up the primary Frame Relay link in the event of link failure. LAN traffic from all three routers should be encrypted with an IPSec tunnel using pre-shared keys over a multipoint topology. RFC 1918 internal IP address on R3 should be encrypted with an IPSec tunnel when traffic is destined for the FastEthernet networks of R1 and R2. Telnet traffic should be guaranteed 32 kbps of Frame Relay bandwidth using CBWFQ. 6-6 CCNP 2: Remote Access v3.1 Copyright 2003, Cisco Systems, Inc.