EVE ACL Challenge

EVE Starting Topology

Reflections from the unit coordinator in previous years ...

• Depending on the errors made, many students will break OSPF communications and thus all communications fail. It's a good learning experience but only if students eventually figure out what has happened. Many students assume the lack of communications is because the ACL is blocking their packets. In reality, the router has no route because OSPF is down.

Basic ACLs Starting Topology

Topology

Addressing Table

Device         Interface          IP Address        Subnet Mask         Default Gateway
                 e0/0            192.168.10.1       255.255.255.0 
R1               e0/1            192.168.11.1       255.255.255.0
                 s2/0            10.1.1.1           255.255.255.252

                 s2/0            10.1.1.2           255.255.255.252
R2               s2/1            10.2.2.1           255.255.255.252
                 S2/2            209.165.200.226    255.255.255.224

                 e0/1            192.168.30.1       255.255.255.0
R3               s2/1            10.2.2.2           255.255.255.252

ISP              s1/0            209.165.200.226    255.255.255.224
 
PC1              NIC             192.168.10.10      255.255.255.0        192.168.10.1

PC2              NIC             192.168.11.10      255.255.255.0        192.168.11.1

PC3              NIC             192.168.30.10      255.255.255.0        192.168.30.1

Learning Objectives

• With reference to the Basic ACL Lab design and configure your own rules.

Preparation

• Run the EVE Topology and copy & paste the following configurations into the appropriate router and PC.

• Load the PC IP configurations with:

• Ensure that there is end-to-end connectivity with the ping command.

Security Policies

Policy 1

No users on the 192.168.10.0 /24 network may send packets to the R2 address 10.1.1.2

• Design an appropriate ACL, apply and test it.
• Consider:
  • Standard or Extended ACL?
  • Where is it best applied.

There may be multiple answers depending on your assumptions. Discuss the options and your thoughts with your peers or the tutor.

Policy 2

Only users on the 192.168.11.0 /24 network may Telnet to 209.165.200.225

• Design an appropriate ACL, apply and test it.
• Consider:
  • Standard or Extended ACL?
  • Where is it best applied.
  • This can be achieved with "access-groups" and "access-classes". Use either method but understand both.
  • Careful to distinguish between IP and TCP.

There may be multiple answers depending on your assumptions. Discuss the options and your thoughts with your peers or the tutor.

Note that in EVE the Virtual PCs support a "ping" command that can be used to test TCP and UDP ports. To see the options try:

PC2> ping help

To test Telnet (port 23) connectivity to 209.165.200.225:

PC2> ping 209.165.200.225 -3 -p 23

Policy 3

Users on IP addresses between 192.168.30.32 and 192.168.30.40 may not ping the Internet Loopback address

• Design an appropriate ACL, apply and test it.
• Consider:
  • Standard or Extended ACL?
  • Where is it best applied.
  • Remember the "implicit deny"

There may be multiple answers depending on your assumptions. Discuss the options and your thoughts with your peers or the tutor.

Initial Device Configurations

PC1

ip 192.168.10.10/24 192.168.10.1

PC2

ip 192.168.11.10/24 192.168.11.1

PC3

ip 192.168.30.10/24 192.168.30.1

R1

hostname R1
interface Ethernet0/0
 no shutdown
 ip address 192.168.10.1 255.255.255.0
!
interface Ethernet0/1
 no shutdown
 ip address 192.168.11.1 255.255.255.0
!
interface Serial2/0
 no shutdown
 ip address 10.1.1.1 255.255.255.252
 serial restart-delay 0
!
router ospf 1
 network 10.1.1.0 0.0.0.3 area 0
 network 192.168.10.0 0.0.0.255 area 0
 network 192.168.11.0 0.0.0.255 area 0
!
line con 0
 logging synchronous
line aux 0
line vty 0 4
 password cisco
 login
 transport input telnet
!
!
end

R2

hostname R2
!
interface Serial2/0
 no shutdown
 ip address 10.1.1.2 255.255.255.252
 serial restart-delay 0
!
interface Serial2/1
 no shutdown
 ip address 10.2.2.1 255.255.255.252
 serial restart-delay 0
!
interface Serial2/2
 no shutdown
 ip address 209.165.200.226 255.255.255.224
 serial restart-delay 0
!
router ospf 1
 network 10.1.1.0 0.0.0.3 area 0
 network 10.2.2.0 0.0.0.3 area 0
 network 209.165.200.224 0.0.0.31 area 0
 default-information originate
!
ip route 0.0.0.0 0.0.0.0 209.165.200.225
!
!
line con 0
 logging synchronous
line aux 0
line vty 0 4
 password cisco
 login
 transport input telnet
!
!
end

R3

hostname R3
!
interface Ethernet0/1
 no shutdown
 ip address 192.168.30.1 255.255.255.0
!
interface Serial2/1
 no shutdown
 ip address 10.2.2.2 255.255.255.252
 serial restart-delay 0
!
router ospf 1
 network 10.2.2.0 0.0.0.3 area 0
 network 192.168.30.0 0.0.0.255 area 0
!
line con 0
 logging synchronous
line aux 0
line vty 0 4
 password cisco
 login
 transport input telnet
!
!
end

ISP

hostname Router
!
interface Serial1/0
 no shutdown
 ip address 209.165.200.225 255.255.255.224
 serial restart-delay 0
!
no ip http server
no ip http secure-server
ip route 0.0.0.0 0.0.0.0 209.165.200.226
!
line con 0
 logging synchronous
line aux 0
line vty 0 4
 login
 transport input none
!
end