Zone-Based Firewall (ZBF) to nowoczesne podejście do filtrowania ruchu w routerach Cisco, zastępujące klasyczne ACL i CBAC. Bazuje na przydzieleniu interfejsów do stref (zones), a następnie definiowaniu polityk między strefami.

Zdefiniuj strefy, do których przypiszesz interfejsy:

zone security ZONA-WEW
zone security ZONA-INTERNET 

interface GigabitEthernet0/0
zone-member security ZONA-WEW

interface GigabitEthernet0/1
zone-member security ZONA-INTERNET 

Określ, jaki typ ruchu będzie rozpoznawany:

class-map type inspect match-any CMAP-WWW
match protocol http
match protocol https 

policy-map type inspect PMAP-WEW-INTERNET
class type inspect CMAP-WWW
inspect
class class-default
drop 

zone-pair security ZP-WEW-DO-INTERNET source ZONA-WEW destination ZONA-INTERNET
service-policy type inspect PMAP-WEW-INTERNET 

show zone security
show zone-pair security
show policy-map type inspect zone-pair 

• Jeśli interfejs nie należy do żadnej strefy, to nie może wymieniać ruchu z żadnym innym interfejsem.
• Komenda `inspect` oznacza zezwolenie i śledzenie sesji.
• Komenda `drop` blokuje nieokreślony ruch domyślnie.

Dodanie reguły dla ICMP:

class-map type inspect match-any CMAP-PING
match protocol icmp

policy-map type inspect PMAP-WEW-INTERNET
class type inspect CMAP-WWW
inspect
class type inspect CMAP-PING
inspect
class class-default
drop 

konfiguracja routera: <code> *Mar 1 00:20:35.819: %SYS-5-CONFIG_I: Configured from console by console R1#show running-config Building configuration…

Current configuration : 1701 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname R1 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 no ip icmp rate-limit unreachable ip cef ! ! ! ! no ip domain lookup ! multilink bundle-name authenticated ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! archive log config

hidekeys

! ! ! ! ip tcp synwait-time 5 ! class-map type inspect match-any TELNET-CLASS match protocol telnet ! ! policy-map type inspect POLICY-INSIDE-TO-OUTSIDE class type inspect TELNET-CLASS

inspect

class class-default

drop

! zone security INSIDE zone security OUTSIDE zone-pair security ZP-INSIDE-OUTSIDE source INSIDE destination OUTSIDE service-policy type inspect POLICY-INSIDE-TO-OUTSIDE ! ! ! ! interface FastEthernet0/0 ip address 1.0.0.1 255.255.255.0 zone-member security INSIDE duplex auto speed auto ! interface Serial0/0 no ip address shutdown clock rate 2000000 ! interface FastEthernet0/1 ip address 2.0.0.1 255.255.255.0 zone-member security OUTSIDE duplex auto speed auto ! interface Serial0/1 no ip address shutdown clock rate 2000000 ! interface Serial0/2 no ip address shutdown clock rate 2000000 ! interface FastEthernet1/0 no ip address shutdown duplex auto speed auto ! interface FastEthernet2/0 no ip address shutdown duplex auto speed auto ! ip forward-protocol nd ! ! no ip http server no ip http secure-server ! no cdp log mismatch duplex ! ! ! ! ! ! control-plane ! ! ! ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 privilege level 15 logging synchronous line aux 0 exec-timeout 0 0 privilege level 15 logging synchronous line vty 0 4 login ! ! end

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