Problem with GRE over IPsec with IOS Version 15.1 (2) T4

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• GRE over IPSEC

  Hi all

  I am setting up IPSEC tunnel GRE... I am able to get neighbors OSPF looked through the GRE tunnel, but when traffic is sent through the gre tunnel it does not encrypt and transmit through plaintext despite she buy from loopback interfaces

  Here is my config

  Config of R1
  crypto ISAKMP policy 10
  BA aes
  preshared authentication
  Group 5
  test key crypto isakmp 192.168.1.2 address

  Crypto ipsec transform-set test aes - esp esp-sha-hmac

  test card crypto-address Ethernet0/0
  test 10 map ipsec-isakmp crypto
  defined peer 192.168.1.2
  Set transform-set test
  match address WILL

  GRE extended IP access list
  allow gre 10.0.10.0 0.0.0.255 10.0.20.0 0.0.0.255

  interface Ethernet0/0
  No switchport
  IP 192.168.1.1 255.255.255.0
  crypto map test

  interface Loopback0
  IP 10.0.10.1 255.255.255.0
  IP ospf 1 zone 0

  Tunnel1 interface
  10.0.100.2 IP address 255.255.255.0
  IP ospf 1 zone 0
  source of tunnel Ethernet0/0
  tunnel destination 192.168.1.1
  end

  -----------------------------------------------------------
  R2 config

  crypto ISAKMP policy 10
  BA aes
  preshared authentication
  Group 5
  test key crypto isakmp 192.168.1.1 address
  !
  !
  Crypto ipsec transform-set test aes - esp esp-sha-hmac
  !
  !
  !
  test card crypto-address Ethernet0/0
  test 10 map ipsec-isakmp crypto
  defined peer 192.168.1.1
  Set transform-set test
  match address GR
  !

  GR extended IP access list
  allow gre 10.0.20.0 0.0.0.255 10.0.10.0 0.0.0.255

  interface Ethernet0/0
  No switchport
  IP 192.168.1.2 255.255.255.0
  crypto map test

  interface Loopback0
  IP 10.0.20.1 255.255.255.0
  IP ospf 1 zone 0

  Tunnel1 interface
  10.0.100.1 IP address 255.255.255.0
  IP ospf 1 zone 0
  source of tunnel Ethernet0/0
  tunnel destination 192.168.1.2
  end

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

  Hello

  With p2p GRE over IPsec solution, all traffic between sites is encapsulated in a GRE p2p package before the process of encryption.

  More info on this link:

  http://www.Cisco.com/c/en/us/TD/docs/solutions/Enterprise/WAN_and_MAN/P2...

  Kind regards

  Aditya

  Please evaluate the useful messages and mark the correct answers.

• GRE over IPSec tunnel cannot pass traffic through it

  I am trying to configure a GRE over IPSec tunnel between sites, we use the router cisco 7613 SUP720 (IOS: s72033-advipservicesk9_wan - mz.122 - 18.SXF15a.bin) and 3845 router (IOS:c3845 - advsecurityk9 - mz.124 - 25c.bin), we are facing problems when we use the tunnel because traffic is not passing through it. the configuration was working when we were using two routers cisco 3845 (IOS:c3845 - advsecurityk9 - mz.124 - 25c.bin), but for some reason, it doesn't work anymore when I paste the configuration on the new 7613 router.

  Head office

  crypto ISAKMP policy 10
  BA aes
  preshared authentication
  Group 5
  ISAKMP crypto key T3ST001 address 0.0.0.0 0.0.0.0
  !
  !
  Crypto ipsec transform-set IPSec_PLC aes - esp esp-sha-hmac
  transport mode
  !
  map PLC - CUM 10 ipsec-isakmp crypto
  defined by peer 167.134.216.89
  game of transformation-IPSec_PLC
  match address 100
  !
  !
  !
  Tunnel1 interface
  bandwidth 1984
  IP 167.134.216.94 255.255.255.252
  Mtu 1476 IP
  load-interval 30
  source of tunnel Serial0/1/0:0
  tunnel destination 167.134.216.89

  interface Serial0/1/0:0
  IP 167.134.216.90 255.255.255.252
  card crypto PLC - CUM

  access-list 100 permit gre 167.134.216.90 host 167.134.216.8

  Router eigrp 100
  network 167.134.216.92 0.0.0.3

  Directorate-General of the

  crypto ISAKMP policy 10
  BA aes
  preshared authentication
  Group 5
  ISAKMP crypto key T3ST001 address 0.0.0.0 0.0.0.0
  !
  !
  Crypto ipsec transform-set IPSec_PLC aes - esp esp-sha-hmac
  transport mode
  !
  map PLC - CUM 10 ipsec-isakmp crypto
  defined by peer 167.134.216.90
  game of transformation-IPSec_PLC
  match address 100

  Tunnel1 interface
  bandwidth 1984
  IP 167.134.216.93 255.255.255.252
  Mtu 1476 IP
  load-interval 30
  source of tunnel Serial1/0/0:1
  tunnel destination 167.134.216.90

  interface Serial1/0/0:1
  bandwidth 1984
  IP 167.134.216.89 255.255.255.252
  IP access-group 101 in
  load-interval 30
  no fair queue
  card crypto PLC - CUM

  access-list 100 permit gre 167.134.216.89 host 167.134.216.90

  ER-7600 #sh crypto isakmp his
  conn-id State DST CBC slot
  167.134.216.89 167.134.216.90 QM_IDLE 3 0

  ER-3845 #sh crypto isakmp his
  status of DST CBC State conn-id slot
  167.134.216.89 167.134.216.90 QM_IDLE 3 0 ACTIVE

  ER-3845 #sh active cryptographic engine connections

  Algorithm of address State IP Interface ID encrypt decrypt
  3 Serial0/1/0: 167.134.216.90 0 HMAC_SHA + AES_CBC 0 0 value
  3001 Serial0/1/0: 167.134.216.90 0 set AES + SHA 0 0
  3002 Serial0/1/0: 167.134.216.90 0 set AES + SHA 61 0

  ER-7600 #sh active cryptographic engine connections

  Algorithm of address State IP Interface ID encrypt decrypt
  3 Serial1/0/0:1 167.134.216.89 set HMAC_SHA + AES_CBC 0 0
  2000 Serial1/0/0:1 167.134.216.89 set HMAC_SHA + 0 66 AES_CBC
  2001 Serial1/0/0:1 167.134.216.89 set HMAC_SHA + AES_CBC 0 0

  I had this error on the er-3845: % CRYPTO-4-RECVD_PKT_NOT_IPSEC: Rec'd package not an IPSEC packet and this one on the IPSEC (epa_des_crypt) UH-7600: decrypted packet has no control of his identity

  Please help, it's so frustrating...

  Thanks in advance

  Oscar

  Here is a document from cisco, mentioning clearly for a card encryption on the two physical as tunnel interface well.

  http://www.Cisco.com/en/us/Tech/tk583/TK372/technologies_configuration_example09186a008009438e.shtml

  It may be useful

  Manish

• The GRE over IPSec vpn

  VAC

  http://www.Cisco.com/en/us/Tech/tk583/TK372/technologies_configuration_example09186a008009438e.shtml#diag

  It's lab that I did today, and offcouse, I am able to understand this laboratory bus are confusion

  1. Why do we use a card encryption on both interfaces (phiycal tunnel interface or interface)

  
  

  2. when I remove the interface tunnel encryption card I have this message

  ( R2691 #* 01:12:54.243 Mar 1: ISAKMP: (1002): purge node 2144544879 )

  Please tell me what is the meaning of this message

  3. but I do not see vpn works great. It comes to cryto his and crypto isakmp his

  R2691 #sh crypto ipsec his

  Interface: Serial0/0

  Crypto map tag: vpn, local addr 30.1.1.21

  protégé of the vrf: (none)

  local ident (addr, mask, prot, port): (30.1.1.21/255.255.255.255/47/0)

  Remote ident (addr, mask, prot, port): (10.1.1.1/255.255.255.255/47/0)

  10.1.1.1 current_peer port 500

  LICENCE, flags is {origin_is_acl},

  #pkts program: 65, #pkts encrypt: 65, #pkts digest: 65

  #pkts decaps: 66, #pkts decrypt: 66, #pkts check: 66

  compressed #pkts: 0, unzipped #pkts: 0

  #pkts uncompressed: 0, #pkts compr. has failed: 0

  #pkts not unpacked: 0, #pkts decompress failed: 0

  Errors in #send 2, #recv 0 errors

  local crypto endpt. : 30.1.1.21, remote Start crypto. : 10.1.1.1

  Path mtu 1500, mtu 1500 ip, ip mtu IDB Serial0/0

  current outbound SPI: 0xDBF65B0E (3690355470)

  SAS of the esp on arrival:

  SPI: 0x44FF512B (1157583147)

  transform: esp-3des esp-md5-hmac.

  running parameters = {Tunnel}

  Conn ID: 5, flow_id: SW:5, crypto card: vpn

  calendar of his: service life remaining (k/s) key: (4598427/3368)

  Size IV: 8 bytes

  support for replay detection: Y

  Status: ACTIVE

  the arrival ah sas:

  SAS of the CFP on arrival:

  outgoing esp sas:

  SPI: 0xDBF65B0E (3690355470)

  transform: esp-3des esp-md5-hmac.

  running parameters = {Tunnel}

  Conn ID: 6, flow_id: SW:6, crypto card: vpn

  calendar of his: service life remaining (k/s) key: (4598427/3368)

  Size IV: 8 bytes

  support for replay detection: Y

  Status: ACTIVE

  outgoing ah sas:

  outgoing CFP sas:

  R2691 #sh crypto isakmp his

  IPv4 Crypto ISAKMP Security Association

  status of DST CBC State conn-id slot

  30.1.1.21 10.1.1.1 QM_IDLE 1002 ASSETS 0

  ISAKMP Crypto IPv6 security association.

  How can 2: I know it using GRE over IPsec.

  I also join my topology on which I made lab

  Also beyond what I remember, in the old codes he was required to have a card encryption on tunnel and physical interface, but now is not.

  Since we use GRE over IPSEC, so for the verification of the tunnel I'll do the following steps:

  (1.) to check if the tunnel interface is in place. "show ip int br".

  2.) check if the statistics of tunnel are increasing and packages are browsing through it. 'show interface '.

  3.) check if crypto ACL includes only interesting traffic listed as GRE counterparts.

  (4.) If Yes, check the IPSEC Security Association statistics. "See the crypto ipsec his."

  If all of them are correct statistical evidence with respective counters increase traffic is passing by GRE and then by wrapping in IPSEC.

  I hope this helps.

  Kind regards

  Anuj

• GRE over IPsec, ASA and NAT - t.

  I want to establish WILL IPsec tunnel between four branches and headquarters. In executive offices, I have router 1841 with the advanced security software. At Headquarters, I have a 7.2 ASA5510 as frontend with a IP address public and 1841 router behind him in the private address space. Given that the ASA does not support GRE tunnels, ASA may be endpoint for GRE over IPsec? If this isn't the case, ASA may pass through this tunnel to the router 1841 behind her, 1841 would be endpoint logic tunnel? What should I watch out for? The ASA and each 1841 support NAT - T, or just ASA?

  The ASA does not support GRE.

  The router would be the GRE tunnel endpoint.  The ASA would be endpoint for IPSEC VPN.  NAT - T should not be a matter of concern if the ASA and the remote routers directly connected to the internet.

  HTH.

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  Dear all,

  I am setting up two routers WAN, each router wan has a physical interface connecting to the branches and regional office by using the same provider.

  We will use the GRE over IPsec to connect to Office regional and DMVPN + EIGRP to branches.

  I would like to know if it is possible to configure tunnels for GRE over IPsec and DMVPN + EIGRP using the same source physical interface.

  Good answer, it's an urgent request and your response is much appreciated.

  Kind regards

  Hi Savio,

  It should work. We can configure dmvpn and gre-over-ipsec on ASA using the same physical interface.

  Kind regards

  NGO

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  Hello world

  We have Cisco 4500 device GRE tunnel and next hop is that ASA makes the IPSEC VPN over WAN.

  If this type of network is called free WILL on the right of IPSEC?

  Also when I do on 4500 sh int tu0

  reliability 255/255, txload 79/255, rxload 121/255

  5 minute input rate 2228000 bps, 790 packets/s

  5 minute output rate 780000 bps, 351 packets/s

  Need to understand which shows that data transmitted by tunnel LIKING which is not encrypted right?

  To verify ipsec ASA which is encrypted data that we do sh right its isakmp crypto?

  When we apply crypto map on the physical interface ASA here?

  Thank you

  Mahesh

  If your GRE tunnel protection applied to this topic, so I think that the transmitted data is encrypted. GRE over ipsec simply means the application of the protection of tunnel to tunnel will otherwise it's just a simple GRE tunnel.

  Side that Show crypto isakmp his, you can also check if the traffic from one site to another is using GRE or not by issuing crypto ipsec to show its, it will tell you the number of Protocol and it should say 47. And if you use the protection tunnel command to set the ipsec tunnel, you will not need to define cryptographic cards more.

• Setting KeepAlive on GRE over IPSEC tunnel

  Hello world

  Need to know if there are benefits of the KeepAlive on GRE over IPSEC implementation that goes over the Wan. ?

  We currently have no KeepAlive on GRE tunnel.

  If we config KeepAlive on both ends of the ACCORD it will cause any overload or the CPU load?

  Thank you

  MAhesh

  If you use a routing on the GRE tunnel protocol you should use KeepAlive WILL not, but I would probably recommend use KeepAlive WILL anyway for the following reasons:

  1. the overload caused by the GRE KeepAlive is quite small, it should not affect the ability to pass traffic

  2. If you ever want to use tracking interface for roads or the static routes that you can interface WILL detect it descend as quickly as possible

  I know that your IPSec device is separate, so I'd probably also enable KeepAlive on the IPSec tunnel as well.

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  Hi guys!

  I have a little problem with my setup.

  I would like to join the Y in X host through a VPN tunnel.

  My setup works fine, until I have add this static nat entry:

  -ip nat inside source static 10.20.20.1 198.41.10.1

  In this case, the tunnel endpoints cannot reach each other (172.16.13.1 <->172.16.13.2).

  The Ext_Router made the Nat translation and the tunnel is located between Ext_Router and R7.

  What is the problem?

  The configuration files are attached.

  

  Hello

  First, I would like to say that my relationship with GRE + IPsec have been pretty slim.

  But what seems to me looking at the configurations and NAT, is that you must following configurations with respect to NAT on R5/Ext_Router

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  Hello

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  iOS devices, however, hurt that is to get or maintain a connection - even if they connect to and then some time later they will fall the network. Go to settings shows the client attempts to connect, but seems to be stuck with an assigned random IP (not on the subnet of law), no gateway by default, etc..

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  or

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