VPN Connection through Zone based Firewall Router Configuration Example
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1 VPN Connection through Zone based Firewall Router Configuration Example Document ID: Contents Introduction Prerequisites Requirements Components Used Conventions Background Information Configure Network Diagram Configurations Verify Troubleshoot Related Information Introduction This document provides a sample configuration that demonstrates how to configure a Router with Zone Based Firewall that also serve as Remote acess VPN gateway. Prerequisites Requirements There are no specific requirements for this document. Components Used The information in this document is based on these software and hardware versions: Cisco IOS Router 1721 Cisco IOS Software Release 12.4T and later 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. Conventions Refer to the Cisco Technical Tips Conventions for more information on document conventions. Background Information Zone based policy firewalls implement unidirectional firewall policy between groups of interfaces known as zones. These examine the source and destination zones from the ingress and egress interfaces for a firewall
2 policy. In the current scenario, Zone based firewall is configured on the VPN Gateway router. It allows VPN traffic from internet (outside zone) to self zone. The virtual template interface is made as part of security zone. The internal network has a server that users on the Internet can access once they are connected through Remote access VPN that terminates on VPN Gateway router. IP address of the Internal server IP address of the Remote Client PC All users on the internal network are allowed unrestricted access to the Internet. All traffic from the Internal users is ed on passing through the Router. Configure In this section, you are presented with the information to configure the features described in this document. Note: Use the Command Lookup Tool (registered customers only) to obtain more information on the commands used in this section. Network Diagram This document uses this network setup: Configurations This document uses these configurations: VPN Gateway#show run Building configuration... VPN Gateway Current configuration : 3493 bytes version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password encryption
3 hostname VPN Gateway boot start marker boot end marker aaa new model Define local authentication aaa authentication login default local aaa authorization network default local Output suppressed Define the isakmp policy parameters crypto isakmp policy 1 encr 3des authentication pre share group 2 crypto isakmp key cisco123 address crypto isakmp keepalive 10 Define the group policy information crypto isakmp client configuration group cisco key cisco dns wins domain cisco.com pool dpool acl 101 Define the ISAKMP profile crypto isakmp profile vi match identity group cisco isakmp authorization list default client configuration address respond virtual template 1 Define the transform set parameters crypto ipsec transform set set esp 3des esp sha hmac Define the IPSec profile crypto ipsec profile vi set transform set set set isakmp profile vi
4 Define the local username and password username cisco privilege 15 password 0 cisco archive log config hidekeys Define the Zone based firewall Class maps class map type match any Internet cmap match protocol icmp match protocol tcp match protocol udp match protocol http match protocol https match protocol pop3 match protocol pop3s match protocol smtp class map type match all ICMP cmap match access group name ICMP class map type match all IPSEC cmap match access group name ISAKMP_IPSEC class map type match all SSHaccess cmap match access group name SSHaccess Define the Zone based firewall Policy maps policy map type inside outside pmap class type Internet cmap class type ICMP cmap class class default drop policy map type outside inside pmap class type ICMP cmap class class default drop policy map type Outside Router pmap class type SSHaccess cmap class type ICMP cmap class type IPSEC cmap pass class class default drop Define zones zone security inside zone security outside Define zone pairs zone pair security inside to outside source inside destination outside service policy type inside outside pmap zone pair security outside to router source outside destination self service policy type Outside Router pmap zone pair security outside to inside source outside destination inside
5 service policy type outside inside pmap interface Ethernet0 ip address Define interface as part of inside zone zone member security inside half duplex interface FastEthernet0 ip address Define interface as part of outside zone zone member security outside speed auto interface Virtual Template1 type tunnel ip unnumbered FastEthernet0 Define interface as part of outside zone zone member security outside tunnel source FastEthernet0 tunnel mode ipsec ipv4 tunnel protection ipsec profile vi Define the local pool range ip local pool dpool Output suppressed ip access list extended ICMP permit icmp any any echo permit icmp any any echo reply permit icmp any any traceroute ip access list extended ISAKMP_IPSEC permit udp any any eq isakmp permit ahp any any permit esp any any permit udp any any eq non500 isakmp ip access list extended SSHaccess permit tcp any any eq 22 access list 101 permit ip any control plane line con 0 line aux 0 line vty 0 4 end
6 Verify Use this section to confirm that your configuration works properly. The Output Interpreter Tool (registered customers only) (OIT) supports certain show commands. Use the OIT to view an analysis of show command output. 1. Use this command in order to verify the interface status. 2. VPN Gateway#show ip interface brief Interface IP Address OK? Method Status Protocol Ethernet YES NVRAM up up FastEthernet YES NVRAM up up Virtual Access1 unassigned YES unset down down Virtual Access YES TFTP up up Virtual Template YES TFTP down down Use this command in order to verify the ISAKMP tunnel status. VPN Gateway#show crypto isakmp sa IPv4 Crypto ISAKMP SA dst src state conn id slot status QM_IDLE ACTIVE IPv6 Crypto ISAKMP SA 3. Use this command in order to verify the state of crypto sockets. VPN Gateway#show crypto socket Number of Crypto Socket connections 1 Vi2 Peers (local/remote): / Local Ident (addr/mask/port/prot): ( / /0/0) Remote Ident (addr/mask/port/prot): ( / /0/0) IPSec Profile: "vi" Socket State: Open Client: "TUNNEL SEC" (Client State: Active) Crypto Sockets in Listen state: Client: "TUNNEL SEC" Profile: "vi" Map name: "Virtual Template1 head 0" 4. Verify the active groups on router. VPN Gateway#show crypto session summary detail Crypto session current status Code: C IKE Configuration mode, D Dead Peer Detection K Keepalives, N NAT traversal, X IKE Extended Authentication Interface: Virtual Access2 Profile: vi Group: cisco Assigned address: Uptime: 00:13:52 Session status: UP ACTIVE Peer: port 1069 fvrf: (none) ivrf: (none) Phase1_id: cisco Desc: (none) IKE SA: local /500 remote /1069 Active Capabilities:CD connid:1001 lifetime:23:46:05 IPSEC FLOW: permit ip / host Active SAs: 2, origin: crypto map Inbound: #pkts dec'ed 10 drop 0 life (KB/Sec) /2767 Outbound: #pkts enc'ed 10 drop 0 life (KB/Sec) /2767
7 Use this command in order to display the runtime type policy map statistics. VPN Gateway#show policy map type zone pair Zone pair: inside to outside Service policy : inside outside pmap Class map: Internet cmap (match any) Match: protocol icmp Match: protocol tcp Match: protocol udp Match: protocol http Match: protocol https Match: protocol pop3 Match: protocol pop3s Match: protocol smtp Session creations since subsystem startup or last reset 0 Maxever session counts (estab/half open/terminating) [0:0:0] Last session created never Maxever session creation rate 0 Class map: ICMP cmap (match all) Match: access group name ICMP Session creations since subsystem startup or last reset 0 Maxever session counts (estab/half open/terminating) [0:0:0] Last session created never Maxever session creation rate 0 Class map: class default (match any) Match: any Drop Zone pair: outside to router Service policy : Outside Router pmap Class map: SSHaccess cmap (match all) Match: access group name SSHaccess Session creations since subsystem startup or last reset 0
8 5. Maxever session counts (estab/half open/terminating) [0:0:0] Last session created never Maxever session creation rate 0 Class map: ICMP cmap (match all) Match: access group name ICMP Packet ion statistics [process switch:fast switch] icmp packets: [93:0] Session creations since subsystem startup or last reset 6 Maxever session counts (estab/half open/terminating) [0:2:0] Last session created 00:07:02 Maxever session creation rate 2 Class map: IPSEC cmap (match all) Match: access group name ISAKMP_IPSEC Pass 57 packets, 7145 bytes Class map: class default (match any) Match: any Drop 2 packets, 44 bytes Zone pair: outside to inside Service policy : outside inside pmap Class map: ICMP cmap (match all) Match: access group name ICMP Packet ion statistics [process switch:fast switch] icmp packets: [1:14] Session creations since subsystem startup or last reset 2 Maxever session counts (estab/half open/terminating) [1:1:0] Last session created 00:09:15 Maxever session creation rate 1 Class map: class default (match any) Match: any Drop 6. Use ping in order to verify the connectivity to the Internal server. E:\Documents and Settings\Administrator>ping Pinging with 32 bytes of data: Reply from : bytes=32 time=206ms TTL=254 Reply from : bytes=32 time=63ms TTL=254 Reply from : bytes=32 time=20ms TTL=254 Reply from : bytes=32 time=47ms TTL=254
9 Troubleshoot Ping statistics for : Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli seconds: Minimum = 20ms, Maximum = 206ms, Average = 84ms There is currently no specific troubleshooting information available for this configuration. Related Information Cisco IOS Firewall Technical Support & Documentation Cisco Systems Contacts & Feedback Help Site Map Cisco Systems, Inc. All rights reserved. Terms & Conditions Privacy Statement Cookie Policy Trademarks of Cisco Systems, Inc. Updated: Jul 06, 2010 Document ID:
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