Multi-tenant IOS Firewall and security even subinterfaces 9.0

Hi all

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We set up a network with clients behind a pair of 5510 s.  All of these clients will have their own dedicated sous-interface in their own VLAN.  Out the door, I got inter - allowed security-same interface and all networks communicate with each other.  I certainly don't want that, so I have disabled this command and now each network client is unable to communicate with each other, as expected.

The problem now lies in networks where a customer have 2 VLANS separated (say a staging and a prod environment) where they need to communicate.  Is it feasible if they are of the same security level and even security allowed inter-interface is disabled?  I just need to create an ACL for the networks to talk?  Is there a better way to do this with the same security allowed active inter-interface?

8.3 pre, I have same security allowed active inter-interface, but traffic could not speak to the other interface unless I created an exemption NAT and ACLs.  Always create a NAT exemption?

Hello

The basic problem that you run with different software levels is the parameter 'nat-control' that exists in 8.2 (or earlier version), but does not exist in version 8.3 (or subsequent version of the Software ASA).

In the 8.2 and pre software you got with the nat configuration change 'control' of requiring a connection to have a NAT configuration to be able to pass traffic through the ASA. Of course this coupled with the 'security level' gave you more changes to control traffic without resorting to the ACL.

However, in the new software of 8.3 and later the "nat-control" level no longer exists and that a connection has a NAT configuration that be applied or not ASA still allows the connection (subject other ASA controls allow) so basically you won't need NAT configurations between your local interface. The most common NAT configurations should be between your local interface and the "external" ASA interface.

If you try to control traffic between interfaces with the global configuration commands you mention, you will eventually be 'juggling' with the 'security level' configurations autour constantly so that the correct rules for traffic is applied.

This question came up on these forums every now and then, and I almost always offer the same approach which is to set up an ACL on EACH interface of the ASA.

  • Remember to leave the 'same-security-traffic"on the SAA configurations. It is because even if you have interface ACL allowing traffic, if they are for some reason any left with identical "security level"custom ACL be sufficient to allow the traffic. "
  • Configure each interface an ACL
  • Initially to configure the ACL to create a "object-group" that will contain EACH network behind your local interface of firewall (except the "outside" ofcourse)
  • Use this category 'object' at THE start of ACL interface to BLOCK ALL traffic behind this interface to these networks
  • After that allow or block different/Out Internet - linked as usual traffic
  • In the same networks 2 (or more) behind the need of different interfaces to communicate with each other, set up a statement that allows early each ACL. The already existing 'decline' exposed with the 'object' group already will ensure that other traffic between networks are blocked

A very simple example, you might want to consider the following

Networks:

  • LAN1: 10.10.10.0/24
  • LAN2: 10.10.20.0/24
  • DMZ1: 192.168.100.0/24
  • DMZ2: 192.168.200.0/24

permit same-security-traffic inter-interface

Interface GigabitEthernet0/0

Description box

interface GigabitEthernet0/0.10

VLAN 10

nameif LAN1

security-level 100

IP 10.10.10.1 255.255.255.0

interface GigabitEthernet0/0.20

VLAN 20

nameif LAN2

security-level 100

IP 10.10.20.1 255.255.255.0

interface GigabitEthernet0/0.100

VLAN 100

nameif DMZ1

security-level 100

IP 192.168.100.1 address 255.255.255.0

interface GigabitEthernet0/0,200

VLAN 200

nameif DMZ2

security-level 100

192.168.200.1 IP address 255.255.255.0

object-group network BLOCK-LOCAL-NETWORKS

object-network 10.10.10.0 255.255.255.0

object-network 10.10.20.0 255.255.255.0

object-network 192.168.10.0 255.255.255.0

object-network 192.168.20.0 255.255.255.0

access-list LAN1 - IN note allow HTTP / HTTPS in the DMZ1 Server

access-list LAN1 - permit tcp 10.10.10.0 255.255.0 host 192.168.100.100 eq www

access-list LAN1 - permit tcp 10.10.10.0 255.255.0 host 192.168.100.100 eq https

LAN1-IN access-list note block traffic to another local network

access-list LAN1 - deny ip any object-group NETWORK-LOCAL-BLOCK

Note LAN1-IN access list allows any outbound

access-list IN LAN1 ip 10.10.10.0 allow 255.255.255.0 any

LAN1-IN group access to the LAN1 interface

And of course all other ACL would follow the same model in one form or another. You would really have to worry about traffic is allowed between interfaces, but rather the most work would probably add "allowed" in the upper part of each ACL when required for communication inter-interface. But I guess that the amount of these additions would remain also to a manageable level for FW admins.

Naturally in environments the biggest you would probably get a high-end ASA and virtualize it and separate each customer environment in their own security context where you would avoid this situation together. Naturally the biggest points against this solution usually can be fresh and the fact that virtualize the ASA multiple context mode disables some essential operational capability of the SAA, which the most important is probably the Client VPN connections (VPN L2L is supported in the software in multiple context Mode 9.x)

Hope this helps

Don't forget to mark the reply as the answer if it answered your question. And/or useful response rates

Request more if needed

-Jouni

Tags: Cisco Security

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