Internal network segmentation using firewalls

Recently, an auditor suggested we should segment the internal network, including all professional applications, population office, internal messaging, remote access and the wan by using firewalls. Anyone done this? If yes why?

The concept of the demilitarized zone (DMZ) provides protection for senior level servers and applications etc. while allowing web servers and mail in general, access and the Internet. If the host is compromised, they do not provide an immediate springboard to important internal servers.

Of the resources of the company risk assessment will determine the level of required access control. Higher instances of compromise are always determined from internal sources and may justify measures of access control applied to the population of office according to the circumstances of the company and the security posture adopted.

See you soon,.

Paul.

Tags: Cisco Security

Similar Questions

  • [Q] create an internal network using Vmware 6.5

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    NIC 2: I want this NETWORK adapter to be connected to a different network called "local".

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    Is it possible to do using VMW 6.5?

    Thank you very much

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    Use only the 'Home' network  It is just a private network for virtual machines, and they can communicate with the host and other virtual machines connected to this network.

    I suppose that the net result is that this specific virtual machine is a gateway to some form.

    NIC 1: I want this NETWORK adapter to be connected to a different network called 'local', and the MAC address is AABBCCDDEEFF

    So, the question will be if the NIC2 of an Image and NIC1 of two images are on the same network?  If so, then just the NIC of Image value only two host as well.

    If two Image must have it's own personal space, then you need to activate another host of the network alone.  I think you can do this under the Publisher Network (Menu Edition or the Start Menu) and then activate a new network only host on a specific VMNet.  Once you have a new network activate (say VMnet5), then the value of this "Custom" and the VMNet5 virtual machine NIC.

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    br >
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    EvilOne

    VMware vExpert 2009

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  • How can I configure a new TimeCapsule for an existing network without having to activate the internal networks?

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  • Message 'internal network card has been disabled to optimize the battery life' will not go away.

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    I can't seem to find information on your system on the Dell WEB site to check your network drivers, so I hope someone will have the magic bullet for your situation.  There are the user forums on the Dell WEB site where you could ask your question to be read by all people of Dell.

    If you think that malicious software might be involved, I would start with this:

    Download, install, update and do a full scan with these free malware detection programs:

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  • Cannot access internal network so AnyConnect SSL VPN, ASA 9.1 (6)

    Hello Cisco community support,

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    Network of the range: 10.1.20.0/24

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    : Material: ASA5512, 4096 MB RAM, CPU Clarkdale 2793 MHz, 1 CPU (2 cores)
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    activate bcn1WtX5vuf3YzS3 encrypted password
    names of
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  • site to site vpn - internal network even on both sides of the tunnel

    Hi all

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    Please help me with the configuration steps & explanation

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    Waiting for your valuable response

    Hello

    Here are a few links on policy nat

    http://www.Cisco.com/en/us/products/HW/vpndevc/ps2030/products_configuration_example09186a00808c9950.shtml

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    http://www.Cisco.com/en/us/products/ps6120/products_configuration_example09186a00807d2874.shtml

    Concerning

  • VPN IS CONNECTED BUT CANNOT ACCESS THE INTERNAL NETWORK

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    6.3 (5) PIX version

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    David Castro,

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    Hello

    I'm trying to configure Cisco VPN L2TP to my office. After a successful login, I can't access the internal network.

    Can you jhelp me to find the problem?

    I have Cisco ASA:

    within the network - 192.168.1.0

    VPN - 192.168.168.0 network

    I have the router to 192.168.1.2 and I cannot ping or access this router.

    Here is my config:

    ASA Version 8.4 (3)

    !

    interface Ethernet0/0

    switchport access vlan 2

    !

    interface Ethernet0/1

    !

    interface Ethernet0/2

    !

    interface Ethernet0/3

    !

    interface Ethernet0/4

    !

    interface Ethernet0/5

    !

    interface Ethernet0/6

    !

    interface Ethernet0/7

    !

    interface Vlan1

    nameif inside

    security-level 100

    IP 192.168.1.1 255.255.255.0

    !

    interface Vlan2

    nameif outside

    security-level 0

    IP 198.X.X.A 255.255.255.248

    !

    passive FTP mode

    permit same-security-traffic intra-interface

    the net-all purpose network

    subnet 0.0.0.0 0.0.0.0

    network vpn_local object

    192.168.168.0 subnet 255.255.255.0

    network inside_nw object

    subnet 192.168.1.0 255.255.255.0

    outside_access_in list extended access permit icmp any any echo response

    outside_access_in list extended access deny ip any any newspaper

    pager lines 24

    Enable logging

    asdm of logging of information

    Within 1500 MTU

    Outside 1500 MTU

    IP local pool sales_addresses 192.168.168.1 - 192.168.168.254

    ICMP unreachable rate-limit 1 burst-size 1

    don't allow no asdm history

    ARP timeout 14400

    NAT dynamic interface of net-all source (indoor, outdoor)

    NAT (inside, outside) source inside_nw destination inside_nw static static vpn_local vpn_local

    NAT (exterior, Interior) source vpn_local destination vpn_local static static inside_nw inside_nw-route search

    !

    network vpn_local object

    dynamic NAT interface (outdoors, outdoor)

    network inside_nw object

    NAT dynamic interface (indoor, outdoor)

    Access-group outside_access_in in interface outside

    Route outside 0.0.0.0 0.0.0.0 198.X.X.B 1

    Timeout xlate 03:00

    Pat-xlate timeout 0:00:30

    Timeout conn 01:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02

    Sunrpc timeout 0:10:00 h323 0:05:00 h225 mgcp from 01:00 0:05:00 mgcp-pat 0:05:00

    Sip timeout 0:30:00 sip_media 0:02:00 prompt Protocol sip-0: 03:00 sip - disconnect 0:02:00

    Timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute

    timeout tcp-proxy-reassembly 0:01:00

    Floating conn timeout 0:00:00

    dynamic-access-policy-registration DfltAccessPolicy

    identity of the user by default-domain LOCAL

    AAA authentication enable LOCAL console

    the ssh LOCAL console AAA authentication

    AAA authentication http LOCAL console

    Enable http server

    http 192.168.1.0 255.255.255.0 inside

    No snmp server location

    No snmp Server contact

    Server enable SNMP traps snmp authentication linkup, linkdown warmstart of cold start

    IKEv1 crypto ipsec transform-set my-transform-set-ikev1 esp-3des esp-sha-hmac

    transport in transform-set my-transform-set-ikev1 ikev1 crypto ipsec mode

    Crypto-map Dynamics dyno 10 set transform-set my-transformation-set-ikev1 ikev1

    card crypto 20-isakmp ipsec vpn Dynamics dyno

    vpn outside crypto map interface

    Crypto isakmp nat-traversal 3600

    Crypto ikev1 allow outside

    IKEv1 crypto policy 10

    preshared authentication

    3des encryption

    sha hash

    Group 2

    life 86400

    Telnet timeout 5

    SSH 192.168.1.0 255.255.255.0 inside

    SSH timeout 30

    Console timeout 0

    management-access inside

    dhcpd address 192.168.1.5 - 192.168.1.132 inside

    dhcpd dns 75.75.75.75 76.76.76.76 interface inside

    dhcpd allow inside

    !

    a basic threat threat detection

    Statistics-list of access threat detection

    no statistical threat detection tcp-interception

    WebVPN

    internal sales_policy group policy

    attributes of the strategy of group sales_policy

    Server DNS 75.75.75.75 value 76.76.76.76

    Protocol-tunnel-VPN l2tp ipsec

    user name-

    user name-

    attributes global-tunnel-group DefaultRAGroup

    address sales_addresses pool

    Group Policy - by default-sales_policy

    IPSec-attributes tunnel-group DefaultRAGroup

    IKEv1 pre-shared-key *.

    tunnel-group DefaultRAGroup ppp-attributes

    ms-chap-v2 authentication

    !

    class-map inspection_default

    match default-inspection-traffic

    !

    !

    type of policy-card inspect dns preset_dns_map

    parameters

    maximum message length automatic of customer

    message-length maximum 512

    Policy-map global_policy

    class inspection_default

    inspect the preset_dns_map dns

    inspect the ftp

    inspect h323 h225

    inspect the h323 ras

    inspect the rsh

    inspect the rtsp

    inspect esmtp

    inspect sqlnet

    inspect the skinny

    inspect sunrpc

    inspect xdmcp

    inspect the sip

    inspect the netbios

    inspect the tftp

    Review the ip options

    !

    global service-policy global_policy

    context of prompt hostname

    no remote anonymous reporting call

    Cryptochecksum:5d1fc9409c87ecdc1e06f06980de6c13

    : end

    Thanks for your help.

    You must test with 'real' traffic on 192.168.1.2 and if you use ping, you must add icmp-inspection:

    Policy-map global_policy

    class inspection_default

    inspect the icmp

    --

    Don't stop once you have upgraded your network! Improve the world by lending money to low-income workers:
    http://www.Kiva.org/invitedBy/karsteni

  • VPN router to router with overlapping of internal networks

    Hello Experts,

    A small question. How to configure a VPN router to router with overlap in internal networks?

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    No link or config will be appreciated. I searched but no luck.

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    Randall

    Randall,

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    Arul

    * Please note all useful messages *.

  • Configure the public traffic network IP inside the internal network itself and not to the external network

    A server is now accessible from external network access using the IP and port in browser below http
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    For the same, we have configured (static NAT) port forwarding in cisco security 1905.

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    Hello

    We have a PIX 515E with a remote access vpn.

    Our internal network has an address network 192.168.1.0/24, and addresses we assign to vpn clients are 192.168.1.49 - 192.168.1.62, or 192.168.1.48/28.

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    interface ethernet0 car

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    access-list outside_inbound udp host 66 license *. **. * Welcome 66 *. **. * eq syslog

    outside_inbound deny ip access list a whole

    pager lines 24

    IP address outside 66 *. **. * 255.255.255.240

    IP address inside 192.168.1.1 255.255.255.0

    IP dmz 192.168.2.1 255.255.255.0

    IP verify reverse path to the outside interface

    local pool IP VPN-RemoteAccess 192.168.1.49 - 192.168.1.62

    ARP timeout 14400

    Global (outside) 10 66 *. **. * netmask 255.255.255.0

    NAT (inside) 0-list of access no_nat_dmz

    NAT (inside) 10 192.168.1.0 255.255.255.0 0 0

    static (dmz, outside) 66 *. **. * c4 netmask 255.255.255.255 0 0

    static (dmz, outside) 66 *. **. * 192.168.2.3 netmask 255.255.255.255 0 0

    static (dmz, outside) 66 *. **. * 192.168.2.5 netmask 255.255.255.255 0 0

    static (dmz, outside) 66 *. **. * 192.168.2.6 netmask 255.255.255.255 0 0

    static (dmz, outside) 66 *. **. * 192.168.2.100 netmask 255.255.255.255 0 0

    static (inside, dmz) 192.168.1.0 192.168.1.0 netmask 255.255.255.0 0 0

    Access-group outside_inbound in interface outside

    Route outside 0.0.0.0 0.0.0.0 66 *. **. * 1

    Timeout xlate 03:00

    Timeout conn 01:00 half-closed 0:10:00 udp 0: CPP 02:00 0:10:00 01:00 h225

    H323 timeout 0:05:00 mgcp 0: sip from 05:00 0:30:00 sip_media 0:02:00

    Timeout, uauth 0:05:00 absolute

    GANYMEDE + Protocol Ganymede + AAA-server

    RADIUS Protocol RADIUS AAA server

    AAA-server local LOCAL Protocol

    NTP server 199.212.17.15 source outdoors

    Enable http server

    http 192.168.1.101 255.255.255.255 inside

    http 192.168.1.105 255.255.255.255 inside

    SNMP-server host inside 192.168.1.105

    No snmp server location

    No snmp Server contact

    SNMP-Server Community public

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    enable floodguard

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    SSH 192.168.1.105 255.255.255.255 inside

    SSH timeout 5

    Console timeout 0

    VPDN PPTP VPN group accept dialin pptp

    VPDN group VPN-PPTP ppp mschap authentication

    VPDN group VPN-PPTP ppp mppe auto encryption required

    the client configuration address local VPN-RemoteAccess VPDN group PPTP VPN

    VPDN group VPN-PPTP client configuration dns 192.168.1.2

    VPDN group VPN-PPTP pptp echo 60

    authentication of VPN-PPTP client to the Group local VPDN

    VPDN username someuser password *.

    VPDN allow outside

    Terminal width 80

    Please use the following URL to check your config:

    http://www.Cisco.com/en/us/products/HW/vpndevc/ps2030/products_configuration_example09186a0080143a5d.shtml

    I hope this helps.

    Jay

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