Posts tagged ASA

cisco ASA: ipsec example
posted on 2016-02-28 14:33:03

I fear I will need something like that soon, so here's a dump I found on google somewhere else: (None of the following is from me! But from here)

Table 1 Preconfiguration Checklist: ISAKMP/Phase-1 Attributes

Attribute   Value
Encryption  AES 128-bit
Hashing SHA-1
Authentication method   Preshared keys
DH group    Group 2 1024-bit field
Lifetime    86,400 seconds

We will use main mode rather than aggressive mode for negotiation. IPsec Phase 2 attributes are used to encrypt and decrypt the actual data traffic.

Table 2 Preconfiguration Checklist: IPsec/Phase-2 Attributes

Attribute   Value
Encryption  AES 128-bit
Hashing SHA-1
Lifetime    28,800 seconds4,608,000 kB
Mode    Tunnel
PFS group   None

Now that we have determined what Phase 1 and Phase 2 attributes to use, we’re ready to configure IPsec. We assume that all IP addresses are already configured and basic connectivity exists between Cisco ASA and pfSense firewall.

ASA Configuration

! IPsec ISAKMP Phase 1

crypto ikev1 policy 1
authentication pre-share
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 enable outside

tunnel-group type ipsec-l2l
tunnel-group ipsec-attributes
ikev1 pre-shared-key Cisc0

! IPsec Phase 2

crypto ipsec ikev1 transform-set pfSense-AES128SHA esp-aes esp-sha-hmac
access-list outside_cryptomap_10 remark ACL to encrypt traffic from ASA to pfSense
access-list outside_cryptomap_10 extended permit ip
crypto map outside_map 10 match address outside_cryptomap_10
crypto map outside_map 10 set peer
crypto map outside_map 10 set ikev1 transform-set pfSense-AES128SHA
crypto map outside_map interface outside
cisco: factory reset for ASA 5510
posted on 2015-09-20 19:30:59

For factory resetting an 'Adaptive Security Appliance', some CLI work has to be done. In the following no prior configuration knowledge is assumed.

get a serial connection

Cisco switches are shipped with a blue female DB9-to-RJ45 adapter cable. (A null modem will not help here, as you need a RJ45 plug at the end which you connect to the ASA's CONSOLE port.)

Such a cable has to be connected to your ASA, and either your serial port of your comp. Since most desktops/laptops do not ship with an rs232 interface anymore, get yourself an male-male USB-to-DB9 adapter.

If you do not have the original cisco cable, use a comparable one: Juniper i.e. ships regular RJ45 ethernet cables plus an female-female RJ45-to-DB9 adapter which works just the same.

In the following a linux operating system is assumed; on windows this works, too. However you have to plug in the adapter, and find out which COM port is used via the device manager, you need this information later when using PuTTy.

On linux you can either go along with minicom, or just use screen. (I have the slight feeling I have written down all this somewhere else already on the blog...)

#as root
screen /dev/ttyUSB0 9600

... and you are connected. Cisco devices in general use 9600 baud, 8bit, 1 stop bit, no flow control. Once I read on official docs about 2 stop bits, but it worked with 1, so go figure it out from the manual if you have trouble with these settings.

step by step

  1. power cycle - turn it off and on again, so it freshly boots after you have connected the serial cable

  2. press ESC here during boot:

    Evaluating BIOS Options ... Launch BIOS Extension to setup ROMMON

    Cisco Systems ROMMON Version (1.0(10)0) #0: Fri Mar 25 23:02:10 PST 2005

    Platform ASA5510

    Use BREAK or ESC to interrupt boot. Use SPACE to begin boot immediately.

  3. confirm current configuration register, if promted if you wish to change anything, answer with 'no':

    rommon #0> confreg

    Current Configuration Register: 0x00000001 Configuration Summary: boot default image from Flash

    Do you wish to change this configuration? y/n [n]: n

    rommon #1>

  4. enter: confreg 0x41

  5. enter: boot

  6. after the appliance has rebooted, you should see this prompt: ciscoasa>

  7. enter privileged mode: enable

  8. erase startup config: write erase

  9. enter config mode: configure terminal

  10. config-register 0x01

  11. exit config mode: exit

  12. confirm via show version, see the end: Configuration register is 0x41 (will be 0x1 at next reload)

  13. save: write

  14. reboot: reload

Done. You now have a fresh ASA at your disposal.

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