IPSEC in Transport mode: what don't understand me?

Hello world

Please, consider the following example:

R1-F1/0(12.12.12.1)---(12.12.12.2) R2 f1/0

R1 has loopback1: 1.1.1.1, R2 has loopback:2.2.2.2

Interesting traffic is between 1.1.1.1 and 2.2.2.2. We must use ipsec in transport mode. But for some reason, no matter how many times I typed transport mode under ipsec encryption, traffic get transferred via IPSEC tunnel in tunnel mode.

R1 config:

crypto ISAKMP policy 10
BA aes 256
preshared authentication
Group 2
address key crypto isakmp 12.12.12.1 CISCO

Crypto ipsec transform-set ESP-AES-192-SHA-384-esp - aes 192 esp-sha-hmac
transport mode

ZEE 10 ipsec-isakmp crypto map
defined by peer 12.12.12.1
transformation-ESP-AES-192-SHA-384 game
match address ZEE

interface FastEthernet1/0
IP 12.12.12.2 255.255.255.0
automatic duplex
automatic speed
card crypto ZEE

Route IP 1.1.1.1 255.255.255.255 12.12.12.1

ZEE extended IP access list
permit ip host 2.2.2.2 1.1.1.1

R2 config

crypto ISAKMP policy 10
BA aes 256
preshared authentication
Group 2
address key crypto isakmp 12.12.12.1 CISCO
!
!
Crypto ipsec transform-set ESP-AES-192-SHA-384-esp - aes 192 esp-sha-hmac
transport mode

ZEE 10 ipsec-isakmp crypto map
defined by peer 12.12.12.1
transformation-ESP-AES-192-SHA-384 game
match address ZEE

interface FastEthernet1/0
IP 12.12.12.2 255.255.255.0
automatic duplex
automatic speed
card crypto ZEE

Route IP 1.1.1.1 255.255.255.255 12.12.12.1

ZEE extended IP access list
permit ip host 2.2.2.2 1.1.1.1

#########################

Then I delete the SA on R1/R2:

R2 #clear crypto isa
R2 #clear isakmp crypto
R2 #show crypto isakmp his
status of DST CBC State conn-id slot
12.12.12.1 12.12.12.2 MM_NO_STATE 1 0 ACTIVE (deleted)

R2 #show crypto ipsec his

Interface: FastEthernet1/0
Tag crypto map: ZEE, local addr 12.12.12.2

protégé of the vrf: (none)
local ident (addr, mask, prot, port): (2.2.2.2/255.255.255.255/0/0)
Remote ident (addr, mask, prot, port): (1.1.1.1/255.255.255.255/0/0)
current_peer 12.12.12.1 port 500

Truncated!

local crypto endpt. : 12.12.12.2, remote Start crypto. : 12.12.12.1
Path mtu 1500, mtu 1500 ip, ip mtu IDB FastEthernet1/0
current outbound SPI: 0x0 (0)

SAS of the esp on arrival:

the arrival ah sas:

SAS of the CFP on arrival:

outgoing esp sas:

outgoing ah sas:

outgoing CFP sas:

R1 #show crypto isakmp his
status of DST CBC State conn-id slot

R1 ipsec crypto #show her

Interface: FastEthernet1/0
Tag crypto map: ZEE, local addr 12.12.12.1

protégé of the vrf: (none)
local ident (addr, mask, prot, port): (1.1.1.1/255.255.255.255/0/0)
Remote ident (addr, mask, prot, port): (2.2.2.2/255.255.255.255/0/0)
current_peer 12.12.12.2 port 500

Truncated!

local crypto endpt. : 12.12.12.1, remote Start crypto. : 12.12.12.2
Path mtu 1500, mtu 1500 ip, ip mtu IDB FastEthernet1/0
current outbound SPI: 0x0 (0)

SAS of the esp on arrival:

the arrival ah sas:

SAS of the CFP on arrival:

outgoing esp sas:

outgoing ah sas:

outgoing CFP sas:

###############

Then, I have ping to 1.1.1. source 2.2.2.2 on R2:

Above, we see the traffic between 1.1.1.1/2.2.2.2 is sent in tunnel mode, even though I configured IPSEC transport mode.

It seems that it does not matter if we have configured ipsec for the mode of transport or not, when using the crypto traffic map is transmitted using tunnel mode.

Thoughts?

Thank you

You cannot use the mode of transport in this situation. You need two-heads IP here: one for end tp (1.1.1.1 to 2.2.2.2) communication and one for transport of IPsec (12.12.12.1 to 12.12.12.2). This is the reason that your router automatically in tunnel mode.

Tags: Cisco Network

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