This document describes how to configure an Layer 2 Tunneling Protocol (L2TP) Tunnel between a windows machine and a Cisco router.
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- Abner Jenkins
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1 Contents Introduction Prerequisites Requirements Components Used Configure Network Diagram Configurations Verify Troubleshoot Related Information Introduction This document describes how to configure an Layer 2 Tunneling Protocol (L2TP) Tunnel between a windows machine and a Cisco router. Prerequisites Requirements Cisco recommends that you have knowledge that windows machine can ping the physical interface IP address on the router. Components Used This document is not restricted to specific software and hardware versions. The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command. Configure Network Diagram This document uses this network setup:
2 Configurations Aggregator Configuration: An example of the configuration on the Aggregator is shown: Windows Machine Configurartions and Settings Complete these steps: Step 1. Open Network and Sharing Center and click Set up a new connection or network as shown in this image. Step 2. Select Connect to a Workplace and click Next
3 Step 3. Select Use my Internet Connection (VPN) Step 4. Enter the IP Address of the Aggregator (in this case ), give a name to the connection (in this case giving the name as VPDN) and click Next.
4 Step 5. Enter the username and password, and click Connect Step 6. Verify the username and password
5 Step 7. It might fail for the first time as shown in this image. Step 8. Click Set up the connection anyway and open Networks tab.
6 Step 9. Right click the connection (here VPDN) and click Properties. Verify the IP address of the Aggregator (here ) Step 10. Navigate to Options and verify the settings, as shown in this image.
7 Step 11. Navigate to Security > as shown in this image. Step 12. Select No encryption allowed option under Data encryption dropdown menu:
8 Step 13. Uncheck Microsoft CHAP Version 2 and click OK. Step 14. Open network (here VPDN) and click Connect.
9 Step 15. Enter Username and Password and click Connect Verify Step 1. Open Networks tab again,select the network (named VPDN in this example) and verify that the status is Connected.
10 Step 2. Open command prompt and run ipconfig /all command. IPv4 address and Domian Name Server (DNS) are assigned by the Aggregator after completing PPP Internet Protocol Control Protocol (IPCP) phase. Step 3. Run debug ppp negotiation command and the other show commands on Aggregator: Aggregator# *Apr 12 06:17:38.148: PPP: Alloc Context [38726D0C] *Apr 12 06:17:38.148: ppp11 PPP: Phase is ESTABLISHING *Apr 12 06:17:38.148: ppp11 PPP: Using vpn set call direction *Apr 12 06:17:38.148: ppp11 PPP: Treating connection as a callin *Apr 12 06:17:38.148: ppp11 PPP: Session handle[a600000b] Session id[11] *Apr 12 06:17:38.148: ppp11 LCP: Event[OPEN] State[Initial to Starting] *Apr 12 06:17:38.148: ppp11 PPP: No remote authentication for call-in *Apr 12 06:17:38.148: ppp11 PPP LCP: Enter passive mode, state[stopped] *Apr 12 06:17:38.607: ppp11 LCP: I CONFREQ [Stopped] id 0 len 21 *Apr 12 06:17:38.607: ppp11 LCP: MRU 1400 (0x ) *Apr 12 06:17:38.607: ppp11 LCP: MagicNumber 0x795C7CD1 (0x C7CD1) *Apr 12 06:17:38.607: ppp11 LCP: PFC (0x0702) *Apr 12 06:17:38.607: ppp11 LCP: ACFC (0x0802) *Apr 12 06:17:38.607: ppp11 LCP: Callback 6 (0x0D0306) *Apr 12 06:17:38.608: ppp11 LCP: O CONFREQ [Stopped] id 1 len 10 *Apr 12 06:17:38.608: ppp11 LCP: MagicNumber 0xF7C3D2B9 (0x0506F7C3D2B9) *Apr 12 06:17:38.608: ppp11 LCP: O CONFREJ [Stopped] id 0 len 7 *Apr 12 06:17:38.608: ppp11 LCP: Callback 6 (0x0D0306) *Apr 12 06:17:38.608: ppp11 LCP: Event[Receive ConfReq-] State[Stopped to REQsent] *Apr 12 06:17:38.615: ppp11 LCP: I CONFACK [REQsent] id 1 len 10 *Apr 12 06:17:38.615: ppp11 LCP: MagicNumber 0xF7C3D2B9 (0x0506F7C3D2B9) *Apr 12 06:17:38.615: ppp11 LCP: Event[Receive ConfAck] State[REQsent to ACKrcvd] *Apr 12 06:17:38.615: ppp11 LCP: I CONFREQ [ACKrcvd] id 1 len 18 *Apr 12 06:17:38.615: ppp11 LCP: MRU 1400 (0x ) *Apr 12 06:17:38.615: ppp11 LCP: MagicNumber 0x795C7CD1 (0x C7CD1) *Apr 12 06:17:38.616: ppp11 LCP: PFC (0x0702) *Apr 12 06:17:38.616: ppp11 LCP: ACFC (0x0802) *Apr 12 06:17:38.616: ppp11 LCP: O CONFNAK [ACKrcvd] id 1 len 8 *Apr 12 06:17:38.616: ppp11 LCP: MRU 1500 (0x010405DC) *Apr 12 06:17:38.616: ppp11 LCP: Event[Receive ConfReq-] State[ACKrcvd to ACKrcvd] *Apr 12 06:17:38.617: ppp11 LCP: I CONFREQ [ACKrcvd] id 2 len 18 *Apr 12 06:17:38.617: ppp11 LCP: MRU 1400 (0x ) *Apr 12 06:17:38.617: ppp11 LCP: MagicNumber 0x795C7CD1 (0x C7CD1) *Apr 12 06:17:38.617: ppp11 LCP: PFC (0x0702) *Apr 12 06:17:38.617: ppp11 LCP: ACFC (0x0802) *Apr 12 06:17:38.617: ppp11 LCP: O CONFNAK [ACKrcvd] id 2 len 8 *Apr 12 06:17:38.617: ppp11 LCP: MRU 1500 (0x010405DC) *Apr 12 06:17:38.617: ppp11 LCP: Event[Receive ConfReq-] State[ACKrcvd to ACKrcvd] *Apr 12 06:17:38.618: ppp11 LCP: I CONFREQ [ACKrcvd] id 3 len 18
11 *Apr 12 06:17:38.618: ppp11 LCP: MRU 1500 (0x010405DC) *Apr 12 06:17:38.618: ppp11 LCP: MagicNumber 0x795C7CD1 (0x C7CD1) *Apr 12 06:17:38.618: ppp11 LCP: PFC (0x0702) *Apr 12 06:17:38.618: ppp11 LCP: ACFC (0x0802) *Apr 12 06:17:38.618: ppp11 LCP: O CONFACK [ACKrcvd] id 3 len 18 *Apr 12 06:17:38.618: ppp11 LCP: MRU 1500 (0x010405DC) *Apr 12 06:17:38.618: ppp11 LCP: MagicNumber 0x795C7CD1 (0x C7CD1) *Apr 12 06:17:38.618: ppp11 LCP: PFC (0x0702) *Apr 12 06:17:38.619: ppp11 LCP: ACFC (0x0802) *Apr 12 06:17:38.619: ppp11 LCP: Event[Receive ConfReq+] State[ACKrcvd to Open] *Apr 12 06:17:38.621: ppp11 LCP: I IDENTIFY [Open] id 4 len 18 magic 0x795C7CD1MSRASV5.20 *Apr 12 06:17:38.621: ppp11 LCP: I IDENTIFY [Open] id 5 len 24 magic 0x795C7CD1MSRAS-0-ADMIN-PC *Apr 12 06:17:38.621: ppp11 LCP: I IDENTIFY [Open] id 6 len 24 magic 0x795C7CD1Z8Of(U3G.cIwR<#! *Apr 12 06:17:38.626: ppp11 PPP: Queue IPV6CP code[1] id[7] *Apr 12 06:17:38.626: ppp11 PPP: Queue IPCP code[1] id[8] *Apr 12 06:17:38.640: ppp11 PPP: Phase is FORWARDING, Attempting Forward *Apr 12 06:17:38.640: ppp11 LCP: State is Open *Apr 12 06:17:38.657: Vi3.1 PPP: Phase is ESTABLISHING, Finish LCP *Apr 12 06:17:38.657: Vi3.1 PPP: Phase is UP *Apr 12 06:17:38.657: Vi3.1 IPCP: Protocol configured, start CP. state[initial] *Apr 12 06:17:38.657: Vi3.1 IPCP: Event[OPEN] State[Initial to Starting] *Apr 12 06:17:38.657: Vi3.1 IPCP: O CONFREQ [Starting] id 1 len 10 *Apr 12 06:17:38.657: Vi3.1 IPCP: Address (0x0306AC100101) *Apr 12 06:17:38.657: Vi3.1 IPCP: Event[UP] State[Starting to REQsent] *Apr 12 06:17:38.657: Vi3.1 PPP: Process pending ncp packets *Apr 12 06:17:38.657: Vi3.1 IPCP: Redirect packet to Vi3.1 *Apr 12 06:17:38.657: Vi3.1 IPCP: I CONFREQ [REQsent] id 8 len 34 *Apr 12 06:17:38.657: Vi3.1 IPCP: Address (0x ) *Apr 12 06:17:38.657: Vi3.1 IPCP: PrimaryDNS (0x ) *Apr 12 06:17:38.657: Vi3.1 IPCP: PrimaryWINS (0x ) *Apr 12 06:17:38.657: Vi3.1 IPCP: SecondaryDNS (0x ) *Apr 12 06:17:38.657: Vi3.1 IPCP: SecondaryWINS (0x ) *Apr 12 06:17:38.657: Vi3.1 IPCP AUTHOR: Done. Her address , we want *Apr 12 06:17:38.657: Vi3.1 IPCP: Pool returned *Apr 12 06:17:38.657: Vi3.1 IPCP: O CONFREJ [REQsent] id 8 len 16 *Apr 12 06:17:38.658: Vi3.1 IPCP: PrimaryWINS (0x ) *Apr 12 06:17:38.658: Vi3.1 IPCP: SecondaryWINS (0x ) *Apr 12 06:17:38.658: Vi3.1 IPCP: Event[Receive ConfReq-] State[REQsent to REQsent] *Apr 12 06:17:38.658: Vi3.1 IPV6CP: Redirect packet to Vi3.1 *Apr 12 06:17:38.658: Vi3.1 IPV6CP: I CONFREQ [UNKNOWN] id 7 len 14 *Apr 12 06:17:38.658: Vi3.1 IPV6CP: Interface-Id F0AA:D7A4:5750:D93E (0x010AF0AAD7A45750D93E) *Apr 12 06:17:38.658: Vi3.1 LCP: O PROTREJ [Open] id 2 len 20 protocol IPV6CP (0x E010AF0AAD7A45750D93E) *Apr 12 06:17:38.672: Vi3.1 IPCP: I CONFACK [REQsent] id 1 len 10 *Apr 12 06:17:38.672: Vi3.1 IPCP: Address (0x0306AC100101) *Apr 12 06:17:38.672: Vi3.1 IPCP: Event[Receive ConfAck] State[REQsent to ACKrcvd] *Apr 12 06:17:38.672: Vi3.1 IPCP: I CONFREQ [ACKrcvd] id 9 len 22 *Apr 12 06:17:38.672: Vi3.1 IPCP: Address (0x ) *Apr 12 06:17:38.672: Vi3.1 IPCP: PrimaryDNS (0x ) *Apr 12 06:17:38.672: Vi3.1 IPCP: SecondaryDNS (0x ) *Apr 12 06:17:38.672: Vi3.1 IPCP: O CONFNAK [ACKrcvd] id 9 len 22 *Apr 12 06:17:38.672: Vi3.1 IPCP: Address (0x03060A010109) *Apr 12 06:17:38.672: Vi3.1 IPCP: PrimaryDNS (0x ) *Apr 12 06:17:38.672: Vi3.1 IPCP: SecondaryDNS (0x ) *Apr 12 06:17:38.672: Vi3.1 IPCP: Event[Receive ConfReq-] State[ACKrcvd to ACKrcvd] *Apr 12 06:17:38.747: Vi3.1 IPCP: I CONFREQ [ACKrcvd] id 10 len 22 *Apr 12 06:17:38.747: Vi3.1 IPCP: Address (0x03060A010109) *Apr 12 06:17:38.747: Vi3.1 IPCP: PrimaryDNS (0x ) *Apr 12 06:17:38.747: Vi3.1 IPCP: SecondaryDNS (0x ) *Apr 12 06:17:38.747: Vi3.1 IPCP: O CONFACK [ACKrcvd] id 10 len 22 *Apr 12 06:17:38.748: Vi3.1 IPCP: Address (0x03060A010109) *Apr 12 06:17:38.748: Vi3.1 IPCP: PrimaryDNS (0x ) *Apr 12 06:17:38.748: Vi3.1 IPCP: SecondaryDNS (0x ) *Apr 12 06:17:38.748: Vi3.1 IPCP: Event[Receive ConfReq+] State[ACKrcvd to Open]
12 *Apr 12 06:17:38.768: Vi3.1 IPCP: State is Open *Apr 12 06:17:38.769: Vi3.1 Added to neighbor route AVL tree: topoid 0, address *Apr 12 06:17:38.769: Vi3.1 IPCP: Install route to Aggregator#show caller ip Line User IP Address Local Number Remote Number <-> Vi in Aggregator#show ip interface brief exclude un Interface IP-Address OK? Method Status Protocol GigabitEthernet0/0/ YES manual up up Loopback YES manual up up Step 4. Verify whether the Windows machine can reach the remote network behind Aggregator (in this case Loopback 100 interface) Troubleshoot There is currently no specific troubleshooting information available for this configuration. Related Information Understanding VPDN Technical Support & Documentation - Cisco Systems
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