Configuring Anyconnect on ASA 8.2

Anyconnect Confiuration

domain-name netx.com
!
crypto key generate rsa label sslvpnkeypair modulus 1024
!
crypto ca trustpoint localtrust
enrollment self
fqdn sslvpn.netx.com
subject-name CN=sslvpn.netx.com
keypair sslvpnkeypair
!
crypto ca enroll localtrust noconfirm
!
ssl trust-point localtrust outside
!Above configuration  is for Self Signed Certificate
copy tftp://172.16.1.66/anyconnect-win-2.0.0343-k9.pkg flash
!copy anyconnect s/w package to flash/disk0
webvpn
svc image disk0:/anyconnect-win-2.0.0343-k9.pkg 1
enable outside
svc enable
!
ip local pool SSLClientPool 192.168.25.1-192.168.25.50 mask 255.255.255.0
!
group-policy SSLCLientPolicy internal
group-policy SSLCLientPolicy attributes
dns-server value 172.16.1.95
vpn-tunnel-protocol svc
default-domain value netx.com
address-pools value SSLClientPool
!
sysopt connection permit-vpn
!
tunnel-group SSLClientProfile type remote-access
tunnel-group SSLClientProfile general-attributes
default-group-policy SSLCLientPolicy
tunnel-group SSLClientProfile webvpn-attributes
group-alias SSLVPNClient enable
!
webvpn
tunnel-group-list enable
!
access-list no_nat extended permit ip host 172.16.1.0 255.255.255.0 192.168.25.0 255.255.255.0
!
nat (inside) 0 access-list no_nat

nat (inside) 1 0 0
global (outside) 1 interface
!
username netx password netx
username netx attributes
service-type remote-access
!

Configuring Network Object NAT in ASA 8.4

Network Object NAT
(ASA 8.4)

-----------------------------

Dynamic NAT 
The following example configures dynamic NAT that hides 192.168.2.0 network behind a range of
outside addresses 2.2.2.1-2.2.2.10:

ASA(config)# object network my-range-obj
ASA(config-network-object)# range 2.2.2.1 2.2.2.10
ASA(config)# object network my-inside-net
ASA(config-network-object)# subnet 192.168.2.0 255.255.255.0
ASA(config-network-object)# nat (inside,outside) dynamic my-range-obj


Dynamic PAT
The following example configures dynamic PAT that hides the 192.168.2.0 network behind address
2.2.2.2:
ASA(config)# object network my-inside-net
ASA(config-network-object)# subnet 192.168.2.0 255.255.255.0
ASA(config-network-object)# nat (inside,outside) dynamic 2.2.2.2


The following example configures dynamic PAT that hides the 192.168.2.0 network behind the outside interface address:
ASA(config)# object network my-inside-net
ASA(config-network-object)# subnet 192.168.2.0 255.255.255.0
ASA(config-network-object)# nat (inside,outside) dynamic interface


Dynamic NAT with Dynamic PAT backup
The following example configures dynamic NAT with dynamic PAT backup. Hosts on inside network 10.76.11.0 are mapped first to the nat-range1 pool (10.10.10.10-10.10.10.20). After all addresses in the nat-range1 pool are allocated, dynamic PAT is performed using the pat-ip1 address (10.10.10.21). In the unlikely event that the PAT translations are also use up, dynamic PAT is performed using the outside interface address.

ASA(config)# object network nat-range1
ASA(config-network-object)# range 10.10.10.10 10.10.10.20
!pool of public IP address(Dynamic NAT)

ASA(config-network-object)# object network pat-ip1
ASA(config-network-object)# host 10.10.10.21
!single Public IP for PAT (dynamic PAT)

ASA(config-network-object)# object-group network nat-pat-grp
ASA(config-network-object)# network-object object nat-range1
ASA(config-network-object)# network-object object pat-ip1
!Object grouping of dynamic NAT and then dynamic PAT in order

ASA(config-network-object)# object network my_net_obj5
ASA(config-network-object)# subnet 10.76.11.0 255.255.255.0
ASA(config-network-object)# nat (inside,outside) dynamic nat-pat-grp interface
!private subnet and nat config: first NAT using object group(in order) if full use interface(outside) for PAT

Static NAT
The following example configures static NAT for the real host 1.1.1.1 on the inside to 2.2.2.2 on the outside with DNS rewrite enabled.
ASA(config)# object network my-host-obj1
ASA(config-network-object)# host 1.1.1.1
ASA(config-network-object)# nat (inside,outside) static 2.2.2.2 dns

The following example configures static NAT for the real host 1.1.1.1 on the inside to 2.2.2.2 on the outside using a mapped object.
ASA(config)# object network my-mapped-obj
ASA(config-network-object)# host 2.2.2.2
ASA(config-network-object)# object network my-host-obj1
ASA(config-network-object)# host 1.1.1.1
ASA(config-network-object)# nat (inside,outside) static my-mapped-obj


Static PAT
The following example configures static NAT with port translation for 1.1.1.1 at TCP port 21 to the
outside interface at port 2121.
ASA(config)# object network my-ftp-server
ASA(config-network-object)# host 1.1.1.1
ASA(config-network-object)# nat (inside,outside) static interface service tcp 21 2121


Identity NAT
The following example maps a host address to itself using an inline mapped address:
ASA(config)# object network my-host-obj1
ASA(config-network-object)# host 10.1.1.1
ASA(config-network-object)# nat (inside,outside) static 10.1.1.1

NAT 0 statement in Cisco FIrewall (PIX/ASA)

NAT 0 STATEMENT:

nat (inside_interface_name) 0

NAT 0 has two affects:
   

1. nat (inside_interface_name) 0 access-list 101 
   
   This works exactly the same way as static, except it bypasses NAT.  It does not require the connection to be initiated from the higher security interface before the host on the lower security interface can create a connection to the host on the higher security level interface.
2. nat (inside_interface_name) 0 0.0.0.0 0.0.0.0 
   
   This bypasses NAT, but requires the host on the higher security interface to first initiate a connection to the host on the lower security interface before the host on the lower security interface can initiate
   a connection.

NAT Order of Operation in Cisco Firewall (ASA/PIX)

1. nat 0 access-list (nat-exempt)
2. match against existing xlates
3. static statements
   
      
   1. static nat with and without access-list (first match)
   2. static pat with and without access-list (first match) 
      
4. nat
      
   1. nat access-list (first match) 
      
      Note: The nat 0 access-list command is not part of this command.
   2. nat (best match) 
      
      Note: When choosing a global address from multiple pools with the same NAT ID, this order is attempted:
             
      1. If the ID is 0, create an identity xlate.
      2. Use the global pool for the dynamic NAT.
      3. Use the global pool for the dynamic PAT.