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Named Access-List

Written by Rene Molenaar on . Posted in Security

Scenario:

After configuring standard and extended access-lists for the agents of three well-known agencies you were promoted to junior security operator. It's now time to upgrade your skills and show them how to implement named access-lists.

Goal:

  • All IP addresses have been configured for you, look at the topology picture for the IP addresses.
  • OSPF has been configured for full connectivity.
  • All routers are running services like HTTP, HTTPS, TELNET and SSH.
  • Make sure you use the most specific wildcard for all your access-lists.
  • You are not allowed to use numbered access-lists, only named access-lists.
  • Configure the network so users from router NSA's L1 interface are not allowed to reach the HTTPS server on router CIA's L2 interface.
  • Configure the network so nobody is allowed to reach HTTP servers on router NSA except the L2 interface on router FBI.
  • Configure the network so users from router NSA's L0 interface are allowed to reach the HTTPS server on router CIA's L2 interface.
  • Configure the network so users from router CIA's L2 interface are not allowed to SSH into router FBI's 222.222.222.222 IP address.

Topology:

Named Access-List

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Comments (2)

  • avatar
    Vitaly C.
    Quote:
    Configure the network so nobody is allowed to reach HTTP servers on router NSA except the L2 interface on router FBI.

    I think it will be more correct, if I understand correctly the condition.

    Extended IP access list ALLOWFBI
    10 permit tcp 222.222.220.0 0.0.3.255 any eq www
    20 deny tcp any any eq www
    30 permit ip any any

    Although I could be wrong..

  • avatar
    ReneMolenaar
    Quote:
    think it will be more correct, if I understand correctly the condition.

    Extended IP access list ALLOWFBI
    10 permit tcp 222.222.220.0 0.0.3.255 any eq www
    20 deny tcp any any eq www
    30 permit ip any any

    Although I could be wrong..

    That is a good looking access-list.