NAT loopback

Hello everyone!

I have a problem with product safe@Office CheckPoint and CheckPoint told me I can perform NAT on my PIX loopback to solve the problem. Can someone tell me how to configure the PIX of NAT Loopback?

Thanks in advance, broadband

Michael

Hello

Interfaces loopback is available in IOS. The only exception-NAT, you can do it in the PIX is "nat 0" refers to an access list.

Best regards

/ M

Tags: Cisco Security

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    MTA receive maximum-recipients 0

    !

    !

    interface Ethernet0/0

    Description connected to the Internet

    IP 199.201.44.198 255.255.255.248

    IP access-group 101 in

    NAT outside IP

    inspect the IP Ethernet_0_0 in

    no ip route cache

    no ip mroute-cache

    Half duplex

    clientmap card crypto

    !

    interface Serial0/0

    no ip address

    Shutdown

    !

    interface Ethernet0/1

    Connected to the private description

    IP 192.168.1.254 255.255.255.0

    IP access-group 100 to

    IP nat inside

    inspect the IP Ethernet_0_1 in

    Half duplex

    !

    IP local pool vpnpool 192.168.2.201 192.168.2.210

    period of translation nat IP 119

    !!

    !! -removed the following line for VPN configuration

    !! IP nat inside source list 1 interface Ethernet0/0 overload

    !! -replaced by the next line...

    IP nat inside source map route sheep interface Ethernet0/0 overload

    IP nat inside source 192.168.1.1 static 199.201.44.197

    IP classless

    IP route 0.0.0.0 0.0.0.0 199.201.44.193 permanent

    IP http server

    7 class IP http access

    local IP http authentication

    !

    access-list 1 permit 192.168.1.0 0.0.0.255

    access-list 5 permit 192.5.41.40

    access-list 5 permit 192.5.41.41

    access-list 5 refuse any

    access-list 7 permit 192.168.1.0 0.0.0.255

    access-list 7 refuse any

    access-list 99 refuse any

    access-list 100 permit udp any eq rip all rip eq

    access-list 100 permit tcp 192.168.1.1 host any eq www

    access-list 100 permit ip 192.168.1.1 host everything

    access list 100 permit tcp host 192.168.1.2 any eq www

    access-list 100 permit ip 192.168.1.2 host everything

    access-list 100 deny ip 192.168.1.253 host everything

    access ip-list 100 permit a whole

    access-list 101 deny host ip 199.201.44.197 all

    access-list 101 permit tcp any host 199.201.44.197 eq 22

    access-list 101 permit tcp any host 199.201.44.197 eq www

    access-list 101 permit tcp any host 199.201.44.197 eq 115

    access-list 101 permit icmp any host 199.201.44.197

    access list 101 ip allow any host 199.201.44.198

    access-list 101 permit tcp any host 199.201.44.197 eq 8000

    access-list 101 permit tcp any host 199.201.44.197 eq 8080

    access-list 101 permit tcp any host 199.201.44.197 eq 9090

    access-list 101 permit udp any host 199.201.44.197 eq 7070

    access-list 101 permit udp any host 199.201.44.197 eq 554

    access-list 110 permit ip 192.168.1.0 0.0.0.255 any

    access-list 115 deny ip 192.168.1.0 0.0.0.255 192.168.2.0 0.0.0.255

    access-list 115 permit ip 192.168.1.0 0.0.0.255 any

    !

    sheep allowed 10 route map

    corresponds to the IP 115

    !

    Line con 0

    exec-timeout 0 0

    password 7 XXXXXXXXXXXXXXX

    line to 0

    line vty 0 4

    password 7 XXXXXXXXXXXXXXXX

    !

    NTP-period clock 17208655

    source NTP Ethernet0/0

    peer NTP access-Group 5

    NTP 7 use only group-access

    NTP master 3

    NTP 192.5.41.41 Server

    NTP 192.5.41.40 Server

    !

    end

    ----------

    Config looks OK, you should be able to get for each internal host EXCEPT 192.168.1.1 with this configuration. If you do a ' sho cry ipsec his 'you see Pkts Decaps increment, indicating that you see the traffic of the remote client? " Do you not see Pkts Encaps increment, indicating that you send a response réécrirait the client to the internal host.

    For what is 192.168.1.1, because you have this:

    > ip nat inside source 192.168.1.1 static 199.201.44.197

    It substitutes for this:

    > ip nat inside source map route sheep interface Ethernet0/0 overload

    for this host traffic only and therefore back for just this host is always NAT would have even if you don't want it to be. To work around to send traffic to this host through an interface of closure with no NAT enabled on it, that it is NAT would have stops and allows you to connect via VPN. You can see http://www.cisco.com/warp/public/707/static.html for a detailed explanation, but basically, we must add this:

    loopback interface 0

    IP 1.1.1.1 255.255.255.0

    interface ethernet0/1

    Static IP policy route map

    permissible static route map 10

    match address 120

    set ip next-hop 1.1.1.2

    access-list 120 allow host ip 192.168.1.1 192.168.2.0 0.0.0.255

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