What is IPSec

Similar Questions

• VPN ipsec and port 500

  Hello world

  I connected connection VPN IPSEC.

  Connection works fine.

  Here's the Setup program

  PC---R1---R2--R3---ISP---ASA

  I check on R3

  The R3 CBAC is configured.

  R3 # sh ip inspect sessions | 96.51.x.x Inc.
  65719DB4 (192.168.98.6:59936)-online (96.51.x.x:4500) SIS_OPEN udp session

  What vpn ipsec connection is established, it shows that it is plugged into the port 4500 not 500?

  What is default behavior?

  Initially when he formed theVPN connection it showed both udp, ports 500 and 4500.

  Concerning

  MAhesh

  It has NAT/PAT between R3 and ASA. like address (192.168.98.6) private IP allows you to configure the ipsec session.  IKE detects NAT/PAT exist in NAT - D payload. IKE uses UDP 4500 to negotiate ISAKMP rather than UDP 500. Subsequently, the ESP traffic is also encapsulated in UDP 4500, in this way it can cross the NAT/PAT safely.

  If this behavior is expected.

• Event log issues...

  So im going through my event log to try to understand a blue screen I got recently, and I had a few questions about things I stumbled on in the case log...

  The first is what is IPSec and the IKE and AuthIP entered services modules strategy service agent?

  and on the other hand...

  "Security," it lists these "Audit success".

  In detail, it lists the user as "N/A"? Should I be worried?

  Hello

  Strategy IPSec IKE and AuthIP are all connected and used for internet security and computer security peer and authentication.
  The IKEEXT service hosts the Internet Key Exchange (IKE) and Authenticated Internet Protocol () AuthIP modules overlay. These input modules are used for authentication and key exchange in Internet Protocol security (IPsec). Stopping or disabling the IKEEXT service will disable IKE and AuthIP key with peer computers Exchange. IPsec is typically configured to use IKE and AuthIP; Therefore, stopping or disabling the IKEEXT service might cause IPsec to fail and compromise the security of the system. It is strongly recommended that you have the IKEEXT service operation.
  Internet Protocol security (IPsec) supports to the peer network level authentication, data origin authentication, data integrity, confidentiality (encryption) data and anti-replay protection.  This service apply IPsec policies created through the IP Security Policies snap-in or the command line tool "netsh ipsec '.  If you stop this service, you may experience network connectivity issues if your policy requires that connections use IPsec.  In addition, remote management of the firewall Windows is not available when the service is stopped.
  These two paragraphs were taken from descriptions of services of each of them.
  The system of audits to ensure that they work very well.
  You have run scans with your anti-virus or MSE?
  I hope this helps.
  Jim

• Display PDM

  Hello. Forgive the ignorance, but next to "encryption" tab "appearance under license", there is another acronym beside OF. It is VAC +. What is VAC?

  Thank you

  Hi Anthony,.

  This means that the PIX has a VPN Accelerator Card + (ACC +) what VPN IPSec (IP Security) hardware acceleration features.

  Hope that help - rate pls post if it does.

  Kind regards

  Paresh

• What permits are required to allow IPSec using 8.4 ASA?

  In my lab, I built a tunnel between two ASAs IPsec successfully.  There is a router in the middle to simulate the internet.

  The tunnel only works when I have let echo ICMP message.

  Allowing ICMP 3.4 does not appear to matter.

  I did not allow for ESP or udp 4500 and udp 500 in the access list, only to echo ICMP message.  They are now allowed by default?

  Which contradicts what I've read in textbooks.

  Can someone tell me what are the allowances by default for v8.4 and above?  and what I leave in my ACL?

  Thank you.

  You are welcome.

  You have to have a football game on the crypto ACL to trigger the tunnel, icmp, or whatever, but not necessarily the icmp traffic, example:

  Cess-list allowed extended VPN ip 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0
  or
  list of access VPN extended permitted tcp 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0 eq 80
  or
  extended VPN access list allow icmp 192.168.0.0 255.255.255.0 192.168.1.0 255.255.255.0

  Basically all traffic matching would establish the tunnel.

  If you still not clear, thanks for posting your ACL crypto for review.

  Kind regards

  Aref

• If I config ISAKMP (phase 1) duration shorter than the life expectancy of IPsec (phase 2). What's going to happen.

  Since I couldn't find any document from Cisco (Cisco produces only that, the longer life ISAKMP, safer) of the directive.

  I was wondering if I config life ISAKMP (phase 1) shorter than the life expectancy of IPsec (phase 2). What happens when I still have the traffic through the VPN, the ISAKMP his timeout reachs tunnel. Phase 2 would also got laid off, and turn all the negotiation of Phase 1 VPN again?

  Any help will be appreciated.

  -Angela

  Angela:

  We probably need to consider the context of your use of the term "session".

  If you had to define an ACL crypto that consisted of a single access control entry (example: 192.168.1.0 ip allow 0.0.0.255 192.168.2.0 0.0.0.255), which would be generally * lead to the creation of an ISAKMP security association unique and two IPSec security associations. Lets call it a "session encryption.

  As you said, the implementation of the session "encryption" was triggered by a "session" (for example: TCP) between two hosts (each behind their respective ends of the tunnel). Additional meetings (for example: TCP) between different hosts on two sites, do not need other IPSec security associations. Security associations previously established IPSec supports all traffic defined by the ACE in the ACL crypto.

  For each extra ACE in your ACL crypto, you would see the creation of a pair of IPSec security associations (assuming traffic defined by the ACE triggers it) extra.

  If you need to set the layer 4 criteria (e.g.: TCP port 80) in an ACL crypto, that would be horrible. IPSec security associations are negotiated for each combination of source/target port used by a host. For example: A single host visiting a single web site (by the crypto tunnel), would open in general multiple TCP sessions (each with a different source port), and IPSec security associations are negotiated for each TCP session. This would quickly deplete resources on the cryptographic endpoints.

  We generally use P2P GRE or love with IPSec to swap info dynamic routing between sites. Because the traffic between sites is encapsulated in GRE, only a single proxy is needed.

  edg01 #show crypto ipsec his

  Interface: Tunnel0
  Tag crypto map: addr Tunnel0-head-0, local

  protégé of the vrf: (none)
  local ident (addr, mask, prot, port): (/ 255.255.255.255/47/0)
  Remote ident (addr, mask, prot, port): (/ 255.255.255.255/47/0)

  In this case, a single proxy is used. IP addresses are external physical IP addresses of crypto tunnel endpoints. Mode of transportation (where the 255.255.255.255 masks). The '47' is the GRE protocol.

  * Note: Sometimes, each cryptographic peer begins negotiations with the other, causing two bidirectional redundant ISAKMP SAs.

  Best regards

  Mike

• What is a VPN solution that is more stable than IPSEC VPN? What is the latest version of VPN client recommended for Windows 7 & 8 users?

  Hello

  I would like to ask a few details & concerns on our existing VPN configuration.

  1. What is the Cisco VPN client recommended for users of Windows 7 and 8? Is there an official documentation for this Cisco? We currently use customer VPN Ciso 5.0.7.

  2. we are running IPSEC VPN with only 1 gateway & only local authentication (No ACS) for our client. Recently, we have some concerns that they are the VPN connection is down. Whereas if I'm the one connected to the VPN, my connection is stable. Is there any point that we must consider up in the network. Is there a better configuration or solution that we could recommend to the customer as SSL VPN?

  3. If you want to use SSL VPN anyconnect secure mobility & we want to implement redundancy on the FW, how will the license work?

  Thank you!

  An AnyConnect-based VPN is the replacement recommended for remote IPsec VPN access. (source)

  AnyConnect can use SSL or IPsec (IKEv2) for transport.

  For an ASA redundant firewalls (running 8.3 (1) or later) any permit required AnyConnect are shared between them. that is, you just buy licenses for a member of the HA pair. (source)

• 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:

  capture23.PNG

  

  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.

• Cisco ASA 5510, ipsec vpn. What address to connect the client to

  Hello

  It's maybe a stupid question, but I can't find the answer anywhere.

  I used the ipsec vpn configuration wizard, I activated the external interface to access ipsec and went through SCW pools of addresses etc. When I try to connect with the cisco vpn client to my address of the external interface (of a remote host) I'm unable to connect. I scanned the interface for open ports, but there is not, I have to allow traffic to ipsec at this interface?

  Best regards

  Andreas

  No, once you have configured the access remote vpn ipsec, it will be automatically activated, and you should be able to connect to the ASA outside the ip address of the interface.

  Can you please share the configuration? and also which group name you are trying to access the vpn client?

• IPsec over HTTPS

  Is there a way to create an IPSec connection on port 443 (for example if the UDP Port 500 is blocked by outside firewallrules). I noticed some other routers are able, or if it will support on Netgear UTM in futured upgrades?

  Thank you...

  Never. 500 is integrated with IPSec.

  You can use SSL VPN to 443.

  You see what routers supporting VPN IPSec on 443?

• IM stops working after a minute or two - troubleshooting explains internet connection problems found (the IPsec negotiation failure prevents the connection)

  Need to patch to get IPsec to start working in Internet instant Mesasenger - I fought this for about 3 months. I can't do a Messenger call for more than a minute before having to re - connect - it's driving me crazy - fix your product - Paul * address email is removed from the privacy *.  Settings information (network security) Diagnostics that can block connections:

  filter name: Messaging microsoft instant - name for the provider context: windows Instant Messenger - provider name: Microsoft Corp.Provider - description: Microsoft Windows Firewall: IPsec provider

  Hi paulrhea,
   
  -What version of the operating system are you using?
  -You are able to go online with no problems?
  -Have you been able to use the Messenger without any problem before?
   
  If you use Windows 7 or Windows Vista, follow the suggestion given here.
   
  Try to disable the firewall for the moment and check if it helps fix the problem.
   

  If the problem is resolved, you may need to contact the manufacturer of the program for the settings that can be changed or if there are other updates for this program.

  Note: Firewall can keep the computer worm, pirates etc. Therefore, be sure to turn on the firewall once you are finished with the test.

  If it is Windows Firewall, see the article below:

  Allow a program to communicate through Windows Firewall

  Additional reference on:

  Windows Firewall is blocking a program

• Implementation of IPSec Port Forwarding on a Windows 2012 with a LRT224 Server

  Hi all I hope someone can help me validate my troubleshooting. I'm deploying a Server Windows 2012 that will server as a server vpn for customers. In place is a LRT224 with 4 VLANS set up. I have enabled port forwarding for IPSec (UDP/500), L2TP (UDP/1701) and L2TP (UDP/4500) to go on the server.

  In my Initial test, I put the LRT224 on the same network as the client of my test and realized the Test Client (10 Windows) to try to connect to the WAN of the LRT224 interface. I get this message:

  

  Thinking it could be the configuration of the server, I then put the client system on the same vlan on the LRT224 server. When I tried to connect to it directly by using the IP address of the server as a destination, he succeeded.  It is leading me to believe that it is the LRT224.

  I confirmed that VPN passthrough is enabled.

  The firmware version is by: v1.0.5.03 (February 22, 2016 10:12:17)

  Currently, the firewall is disabled (I would activate once I'm working)

  If anyone has ideas or notice a fault in my tests, I would really appreciate the feedback.

  If additional information would be useful, please let me know what you want and I can work for it.

  Thanks to all in advance.

  FreeFallFour wrote:

  I then put the client system on the same vlan on the LRT224 server. When I tried to connect to it directly by using the IP address of the server as a destination, he succeeded.  It is leading me to believe that it is the LRT224.

  It does normally not as I KNOW because the VPN in an outside in the process. You should test the VPN connection outside the server's IP subnet.

  You have the server configuration that the DNS server in the router to DHCP with DNS Proxy is disabled?

  Are you doing load balancing Internet connection?

• WRT160N & VPN IPSec

  I read a few other posts on similar problems, but none of the answers seem to solve my problem.  I have a WRT160N that the border to my home router, then I have a RV042 for a home office which is located behind the WRT160N.  If I reboot the WRT160N and then open the IPSec tunnel, it connects no problem but only for a few hours and then removes the tunnel.  When I try to reconnect the tunnel no VPN traffic can go out the next House, that seems.  When I look at the logs on the remote VPN router he did not see all of the trying to connect but when I look on the local RV042 it sends packets to connect.  Passage VPN has been activated on the WRT160N and I declined the MTU size to 1350 (as MTU seemed to be the cause of another person) but it doesn't seem to restore the tunnel.  The WRT160N also has the latest firmware (v1.02.2), any ideas of what could be the problem?  Or if there is a solution?

  Don't know how its working now, I passed only ports 500 and 4500 for the RV042 the WRT160N, deleted the static DHCP entry (but somehow the RV042 picks up again and still the same IP) and removed the DMZ for the RV042.  Also adjusted a few setting so that only that the RV042 behind the NAT aggressive game, also the RV042 behind the NAT router is set to authenticate using address dynamic IP and domain name while the main RV042 at the office is set to authenticate using the property intellectual property and domain name that is resolved by my ddns url.  Don't know if this can help someone, but in case it does...

• Services do not start. I get error 5 - BFE, DHCP, & DPS; I get error 1068-IKE, IPsec Service & network list

  Vista Home Premium SP2

  Error 5: Access denied

  Cannot start BFE Base Filtering Engine service

  DHCP Client service

  Diagnostic policy service

  Error 1068: The dependency group or the service could not start

  IKE and AuthIP IPsec Keying Modules

  IPsec policy agent

  Network list service

  Error 1073741288

  Network location awareness

  I checked the forum after forum with no luck.  Any ideas?

  Hello

  ·         What services can you try to start?

  ·         What is the problem you are having with the computer?

  ·         Logged in Administrator?

  ·         You will remember to do recent changes on the computer before this problem?

  ·         Your computer is on the field?

  Response with above information to better help you.

  I suggest you to follow the steps in the link and check if the problem occurs:

  http://answers.Microsoft.com/en-us/Windows/Forum/windows_vista-networking/Windows-could-not-start-error-1068-the-dependency/7963d72a-5d73-44fe-8316-058c46235737?page=1

• IPSec VPN via UDP fails on WRT610N

  Hello

  Using a Cisco VPN, user can connect, but after have connected you to all stops internet connectivity.
  IPsec uses UDP (NAT/PAT).
  Anyway to turn it on? The router VPN Passthroughs are all enabled, I even turned on the UDP multicast filter...
  Nowhere else in configure anything?
  The VPN profile works on the old WRT54G and a SMC router so I guess that's the WRT610N which has a problem?
  Thank you!

  It should not make any difference for the connection if the relay is activated or not. The connection goes through the port UDP ISAKMP 450 that should always work. Disabling the VPN passthrough block ESP IP protocol that is used for data transfer. Your VPN client must then automatically encapsulation UDP Port 4500, which should work fine.

  If the connection does not work once you turn off the pull-out decision, I'd say it's a bug. That should never happen. Check the logs in the client to see what happens, maybe, that there was a suspicion.