IOS防火墙的模板
! ------------------------------------------------------------------
! This first section contains some configuration that is not required
! for CBAC, but illustrates good security practices.
! ------------------------------------------------------------------
!Add this line to get timestamps on the syslog messages.
service timestamps log datetime localtime show-timezone
!
service password-encryption
!
hostname Router1
!
boot system flash c3600-fw3600-l
!
! Configure AAA user authentication.
aaa new-model
aaa authentication login lista tacacs enable
!
enable secret 5 <elided>
ip subnet-zero
!
! Disable source routing to help prevent spoofing.
no ip source-route
!
! Set up the domain name and server IP addresses.
ip domain-name example.com
ip name-server 192.168.55.132
ip name-server 192.168.27.32
!
! The audit-trail command enables the delivery of specific CBAC messages
! through the syslog notification process.
ip inspect audit-trail
!
! Establish the time-out values for DNS queries. When this idle-timer expires,
! the dynamic ACL entries that were created to permit the reply to a DNS request
! will be removed and any subsequent packets will be denied.
ip inspect dns-timeout 10
!
!----------------------------------------------------------------------
!The next section includes configuration statements required
!specifically for CBAC.
!----------------------------------------------------------------------
! Define the CBAC inspection rule "inspect1", allowing the specified protocols to be
! inspected. The first rule enables SMTP specific inspection. SMTP inspection causes
! the exchange of the SMTP session to be inspected for illegal commands. Any packets
! with illegal commands are dropped, and the SMTP session will hang and eventually
! time out.
ip inspect name inspect1 smtp timeout 300
!
! In the next two lines of inspect1, define the maximum time that each of the udp and
! tcp sessions are allowed to continue without any traffic passing
! through the router. When these timeouts are reached, the dynamic ACLs that
! are inserted to permit the returning traffic are removed and subsequent packets
! (possibly even valid ones) will not be permitted.
ip inspect name inspect1 udp timeout 300
ip inspect name inspect1 tcp timeout 300
!
! Define the CBAC inspection rule "inspect2", allowing the specified protocols to be
! inspected. These rules are similar to those used in the inspection rule "inspect1,"
! except that on the interfaces where this rule is applied, SMTP sessions are not
! expected to go through; therefore, the SMTP rule element is not applied here.
ip inspect name inspect2 udp timeout 300
ip inspect name inspect2 tcp timeout 3600
!
!----------------------------------------------------------------------
! The next section shows the Ethernet interface configuration statements for each
! interface, including access lists and inspections rules.
!----------------------------------------------------------------------
! Apply the "inspect1" inspection rule to sessions that are initiated in the outbound
! direction (toward the LAN) at Ethernet interface 0/0. All packets in these sessions
! will be inspected by CBAC. Provided that network traffic passes the Access Control
! List (ACL) restrictions, traffic is then inspected by CBAC for access through the
! IOS Firewall. Traffic blocked by the access list is not inspected by CBAC. Access
! list 110 is applied to outbound traffic on this interface.
interface Ethernet0/0
description HR_Server Ethernet
ip address 172.16.110.1 255.255.255.0
ip access-group 110 out
no ip directed-broadcast
no ip proxy-arp
ip inspect inspect1 out
no cdp enable
!
! Apply access list 120 to inbound traffic on Ethernet interface 0/1.
! Applying access list 120 to inbound traffic provides anti-spoofing on this interface
! by dropping traffic with a source address matching the IP address on a network other
! than Ethernet 0/1. The
