Cisco VPN :: 5510 - L2TP Over IPSEC Static NAT
May 22, 2013
I have a 5510 that i have configured for L2TP over IPSEC, not using AnyConnect. The first, and most prevelant being, VPN clients are unable to ping/access any of the hosts that are assigned a static NAT from the inside interface to the outside interface. I was able to circumvent this by adding another static NAT to the public interface for the incoming clients, but this caused intermittent connectivity issues with inside hosts. The second issue involves DNS. I have configured two DNS servers, both of which reside on the internal network and are in the split_tunnel ACL for VPN clients, but no clients are using this DNS. What is the workaround for using split tunneling AND internal DNS servers, if any?
i've had two different CCNA's look at this numerous times to no avail. A ping from a VPN client to any internal host works fine, unless it is one that is NAT'd. You can see in the config where i added the extra STATIC NAT to try and fix the issue. And this works perfectly across the tunnel but only intermittenly from the internal 10.1.4.x network. [code]
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Jun 23, 2011
Co-worker just got a Blackberry Playbook tablet and, try as I might, we cannot get the darn thing to successfully set up a working IPSEC/L2TP vpn tunnel to our ASA 5510, which acts as a multi-purpose VPN concentrator. Any luck setting up L2TP/IPSEC VPN to ASA from Blackberry Playbook?
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Sep 1, 2011
I'm opening a new topic related to my problem with the VPN connection, to avoid confusion, since there are many, in the old information, no longer required.
I would like to configure my ASA5510 L2PT/IpSec to accept connections from Windows clients. I happen to authenticate via AD credentials. When I try to connect is because the error 691. I enabled debugging on the machine the following:
debug crypto isakmp 3
debug crypto ipsec 3
debug ldap 255
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Nov 14, 2011
i configurated ipsec vpn at cisco asa 5510. all them are working very well. now i want to change ipsec remote vpn to L2tp over ipsec.i have router, asa and 3750 switch. all nat translation are done at router , ipsec vpn configurate at asa.
this is my ipsec configuration. this is working config. as you see i do static nat asa outside ip for vpn at router. now i want l2tp over ipsec. before i do it i have some question
1. must i do static nat port udp 1701 for l2tp over ipsec vpn? can i write access list at asa to open port 1701?
2. can i remove this static nat or i can not be change anything.is this nat is true for l2tp over ipsec vpn?
3.as you see user authentication from radius server at ipsec vpn. i also want this is same as l2tp over ipsec vpn..
4. i think that i must be add this addtional config. is this true? tunnel-group DefaultRAGroup ppp-attributesno authentication chapauthentication ms-chap-v2
is this config enougth for l2tp over ipsec vpn?? what is addtional config i need?
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Dec 21, 2010
I'm trying to setup a L2TP VPN Connection on my ASA 5510 to connect with Android/Windows (Native Clients).I'm using the newest Releases:Cisco Adaptive Security Appliance Software Version 8.3(2) Device Manager Version 6.3(5)
My asa config just the interesting part:
crypto ipsec transform-set trans esp-3des esp-sha-hmac crypto ipsec transform-set trans mode transportcrypto ipsec security-association lifetime seconds 28800crypto ipsec security-association lifetime kilobytes 4608000crypto dynamic-map dyno 10 set transform-set transcrypto map vpn 20 ipsec-isakmp dynamic dynocrypto map vpn interface outsidecrypto isakmp enable outsidecrypto isakmp policy 10 authentication pre-share encryption 3des hash sha group 2 lifetime 86400no crypto isakmp nat-traversal
[code]....
If i try to connect with a Windows 7 Client (NOT behind NAT) I get the Error 691.
I see that Phase 1/2 are working with debug:
Dec 22 16:32:16 [IKEv1]: Group = DefaultRAGroup, IP = XXXXXX, PHASE 1 COMPLETED
Dec 22 16:51:25 [IKEv1]: Group = DefaultRAGroup, IP = XXXXXX, PHASE 2 COMPLETED (msgid=00000001)
Then I see this "Error":
Dec 22 16:51:26 [IKEv1]: Group = DefaultRAGroup, IP = XXXXX, Session is being torn down. Reason: L2TP initiated
I don't understand why it doens't work....I tried many templates from the net but nothings works.
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Mar 3, 2012
I have added an ASA 5510 to my network between the Internet and a Windows 2008R2 server running ForeFront TMG. Before the ASA was added, vpn clients using Microsoft Windows 7 vpn client using L2TP/IPsec connected to our vpn. After ASA was added, clients can no longer connect. I would like to know how to configure the ASA to forward the vpn requests to the ForeFront TMG server for authentication and access to internal network resources. Mail is forwarded appropriately through the ASA to internal mail server and Internet access for LAN users works just fine.
Topology:
ASA 5510 (outside interface is ISP IP address, inside interface is 192.168.1.1)................Forefront TMG (outside nic 192.168.1.2, inside nic is LAN gateway IP address).
I have altered the registry key of the client vpn pc's per Microsoft Technet URL
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Apr 7, 2011
I'm trying to setup a L2TP over IPSEC vpn connection on a PIX 501 that will use key sharing. In addition, I have a PPTP connection setup which allows connectivity. Two things, the L2TP vpn client I am using does not connect and times out. The second is that the PPTP client I use does connect, but cannot ping any resources on the network.
The config on the PIX is below:
Building configuration...
: Saved
:
PIX Version 6.3(3)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password tdkuTUSh53d2MT6B encrypted
[ Code] .....
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Apr 11, 2013
I am trying to get a L2TP/IPSEC VPN going on one of my servers behind the DIR655 router I have used Port Forwarding and Virtual Server and neithere seem to allow these ports to be open in either situation a port scan shows the ports closed..My ISP (Comcast) does not block these ports?
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Oct 28, 2011
I had my PPTP VPN working great at my old place, now that I moved I also upgraded my speed which means I got a different 2Wire. This 2Wire can only do DMZ mode and can't bridge. ( I tried everything, including the mdc page, no go). This works fine apart from blocking GRE somehow. I'm using a Mikrotik RB450G as my PPTP server. Does L2TP or IPSEC use the GRE protocol?
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Nov 26, 2011
I have a stable l2tp/ipsec config that I have been using for many years with the Windows XP native VPN client and the iPhone VPN client.This configuration does not seem to work with the native Windows 7 VPN client. What has changed between XP and 7 on the native VPN client front? I'm running IOS 12.4(15)T5.
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Apr 20, 2011
I have a Cisco 7200 and need to establish L2TP over IPSEC session with a Draytek Fly200. Draytek must use L2TP over IPSEC to provide LAN-to-LAN connectivity. IPSEC phase 1 and 2 is ok, L2TP tunnel is also established, but on cloned virtual-access IPCP negotiation is not completed:
*Sep 16 09:50:36.911: %LINK-3-UPDOWN: Interface Virtual-Access3, changed state to up
L2X_ADJ: Vi3:midchain adj reqd for ip 0.0.0.0, cid 0
*Sep 16 09:50:38.911: Vi3 IPCP: O CONFREQ [REQsent] id 2 len 10
*Sep 16 09:50:38.911: Vi3 IPCP: Address 192.168.176.2 (0x0306C0A8B002)
*Sep 16 09:50:38.911: Vi3 IPCP: Event[Timeout+] State[REQsent to REQsent]
I think my VPDN configuration from Cisco side is not correct, but I cannot find configuration examples for this kind of solution.
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Feb 23, 2011
Successfull in setting up an L2TP/IPsec tunnel through NAT-T against a Windows 2008/ R2 RRAS server? I am using an 881 router and the layout is someting like this:Client -> 881 -> NAT -> internet -> Windows 2008 RRAS.The tunnel goes form the 881 to the Windows server (not from the client...).
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Mar 25, 2011
i have configure l2tp/ipsec vpn on cisco ASA 5520 and also configure windows 7 client but its getting error
Error in ASA debug log
debug crypto isakmp 7
Mar 26 07:44:28 [IKEv1]: IP = 59.161.130.13, IKE_DECODE RECEIVED Message
[Code]......
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Mar 26, 2013
i am now trying to configure a Cisco Small Business Pro SRP 521w router for a branch office, i am trying to get the router to connect to a L2TP VPN server inside my datacenter, but seems to me like L2TP VPN client function is not supported inside the SRP 521w router.
Can Cisco implement L2TP VPN client into the firmware for the SRP 521w router in the future ?
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Dec 29, 2012
Any good vpn config for a router to allow vpn connections from Android phones using L2TP-IPSEC? Router is an 1841 running most current IOS ver 15.1.
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Apr 7, 2013
I'm having problem establish l2tp/ipsec vpn connection from Windows vista/7 vpn client to cisco 1921 ( ios 15.2 )
C1 --------> (internet cloud) ---------> (cisco 1921)----->LAN
Error that I'm retrieving is always the same: Error 789: "The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer"
But I'm able to establish l2tp/ipsec vpn connection to the same vpn server with my iPhone 4.
Below is isakmp debug log from lns router(cisco 1921) when I've tried to establish vpn with windows client. Anything useful from these logs to point me on the right direction to finally solve this problem with windows clients.
#debug crypto isakmp
*Apr 8 10:56:47.018: ISAKMP (0): received packet from 186.51.43.137 dport 500 sport 987 Global (N) NEW SA
*Apr 8 10:56:47.018: ISAKMP: Created a peer struct for 186.51.43.137, peer port 987
*Apr 8 10:56:47.018: ISAKMP: New peer created peer = 0x3296C24C peer_handle = 0x80000068
[Code]...
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Jan 25, 2011
We have ASA 5520 running 8.2(3) software and we're trying to make Remote Access VPN (l2tp/ipsec) working from Android. We succeeded in making IPSEC tunnel (ending "Phase 2 completed"), but we cannot make L2TP tunnel working.We're using RADIUS for L2TP authentication, but ASA doesn't even try to check credentials entered by use. The same set of credentials entered on Windows {XP, VISTA, 7, Mobile} works ok. Which debugging options should we turned on?
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Jul 17, 2011
I have a Cisco ASA 5505 Firewall. I am using windows VPN. I have configure IPSEC/L2TP Vpn. And now i hv some problem..
1) VPN is connected but I notices that VPN client connection gets in "HANG" mode after couple of minutes.
2) I am getting error when i try to connect my SQL Server (windows 2008) [code]
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Aug 22, 2012
Is it possible to configure Layer 2 Tunneling Protocol (L2TP) over IPsec on a cisco router like 1921 ISR? This link shows basically what i want to achieve but instead of an ASA, i would like to use just a router with sec..
[URL]
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May 2, 2011
I’m configuring a L2TP IPSEC VPN on a 5505 asa so that windows 7 clients can natively connect. It connects correctly during Phase 1 and 2, but I can’t ping anything or access resources on the internal network. This is my first time working with an ASA.
Master# sh run
: Saved
:
ASA Version 8.2(2)
!
hostname Master
domain-name service.local
[code]....
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Aug 9, 2011
I would like to allow my remote users to access all resources behind the ASA and my remote branches. Here is my setup. ASA5510 as hub at data-center.
Internal network 172.21.x.x Directly connected
DMZ 172.22.1.x.x Directly Connected
Branch1 10.47.x.x L2L VPN
Branch2 10.47.y.x L2L VPN
Remote users 172.21.y.x L2TP Windows Client
I can access my internal resources connected to the ASA but not the DMZ or branch offices. Do I need routing and reverse route injection?
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Mar 9, 2012
I have an 881W with configuration posted below along with IOS version. The site has a local Exchange server and also a LAN-to-LAN IPSec. Exchange's internal IP is statically NAT'd. Problem is that when that when a static NAT for Exchange is in place, Exchage is not accessible thru tunnel. Scenarios is as below:
Exchange's internal IP: 10.50.80.21Exchange's NAT'd IP: 65.X.X.216IPSec interesting traffic: Local - 10.50.80.0/24, remote - 198.168.189.0/24Static NAT for Exchange in place: Excahgne server can be accessed over Internet. We can RDP in to the
[Code].....
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Oct 29, 2012
configuring some static NAT entries on a remote site 887 router which also has a IPSec tunnel configured back to our main office.
I have been asked to configure some mobile phone "boost" boxes, which will take a mobile phone and send the traffic over the Internet - this is required because of the poor signal at the branch. These boxes connect via Ethernet to the local network and need a direct connection to the Internet and also certain UDP and TCP ports opening up.
There is only one local subnet on site and the ACL for the crypto map dictates that all traffic from this network to our head office go over the tunnel. What I wanted to do was create another vlan, give this a different subnet. Assign these mobile boost boxes DHCP reservations (there is no interface to them so they cannot be configured) and then allow them to break out to the Internet locally rather than send the traffic back to our head office and have to open up ports on our main ASA firewall.
[URL]
So I went ahead and created a separate vlan and DHCP reservation and then also followed the guidelines outlined above about using a route-map to stop the traffic being sent down the tunnel and then configured static NAT statements for each of the four ports these boost boxes need to work. I configure the ip nat inside/outside on the relevant ports (vlan 3 for inside, dialer 1 for outside) The configuration can be seen below for the NAT part;
! Denies vpn interesting traffic but permits all otherip access-list extended NAT-Trafficdeny ip 172.19.191.0 0.0.0.255 172.16.0.0 0.3.255.255deny ip 172.19.191.0 0.0.0.255 10.0.0.0 0.255.255.255deny ip 172.19.191.0 0.0.0.255 192.168.128.0
[Code].....
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Oct 7, 2012
I am trying to set up a static VTI IPsec VPN between a SR520 and a RV110w. This works fine between the 520 and an 861, but the RV110 complains about the "permit ip any any" default policy of the VTI. (Same thing happens with the 861 and rv110) How to put a policy in place that would be used in negotiating the tunnel that the 110 would accept?
Attached the lines out of the 110's log and the VTI setup.
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Nov 29, 2011
I want to assign static IPs to users that login to IPSec VPN using Group Authentication in ASA 8.2. The authentication through a Windows RADIUS server. Right now, they are connecting just fine and pulling an IP from the pool I have configured in the IPSec policy.
What would the best way to assign static IPs through VPN?
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Jun 18, 2012
I'm having problems configuring an IPSEC VPN between an SRP521 with a dynamic IP and a ASA5505 with a static IP. Static to Static is fine between these devices and I can configure that without problems. Dynamic to Static however.
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Aug 14, 2012
i measured with Iperf over two Cisco 1811 router, that bandwidth speed is higher then is used IPsec+GRE tunnel between two routers, than just using a static routes.Bandwidth over GRE in average is about 91389Kbit/sec Over static routes is about 88474Kbit/sec.
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Dec 30, 2011
Is it possible to re-route our Site 2 Site VPN over our Static Route (T1) if the WAN fails?
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May 26, 2011
I'm trying to figure out how to get two 5510 ASA's to establish a Site-to-Site VPN.The version with two static IP's is working perfectly and stable but I haven't figured out how to get a VPN running between a static and a dynamic IP
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May 5, 2012
i have started managing a asa 5510 firewall which is already having 10 ipsec tunnels , the problem i am facing is they are configured as "ipsec vpn map"
i have attached sample config, i am finding it difficult to understand the parameters used in each tunnel as the configration seems bit complex to me, how it works .
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Mar 17, 2013
My dynamic ASA is trying to use a Cradle point 4G connection to a head end ASA-5510. The remote end with the Cradle point 4G is not even initiating the tunnel! I need another set of eyes. it was initiating the tunnel last week but not completing the connection. Now its not doing anything. i am going backwards. Below is my remote ASA config.
ASA5510(config)# sh run
: Saved
ASA Version 8.2(2)
host name ASA5510
enable password 8Ry2YjIyt7RRXU24 encrypted
password 2KFQnbNIdI.2KYOU encrypted
names
[code]...
I have a laptop directly attached to the inside interface. The PC and ASA can ping each other. The test interface is the one I am trying to use. Does my default route need to point to 192.168.0.1? Or is the remote peer correct? I thought the remote peer was correct? The 4G modem is like a pass-thru device. If I connect my laptop to it I can get out to the internet.
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Apr 17, 2013
I have an internal application which requires operators to have a static IP address. I'm looking for a way to do this for our VPN users. At the moment they are given a random DHCP address from a pool. Is there an easy way to get a static address assigned to VPN users on a Cisco ASA5510 any connect VPN?
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Mar 10, 2011
I need to create a IPSec Site-Site VPN in the Single mode firewall. Is it possible to create the tunnel. I have ASA 5510 Security Plus with Ver 8.3
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