Cisco WAN :: Layer 2 Tunneling Protocol (L2TP) Over IPsec On ISR 1921

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..

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RB450G Does L2TP Or IPSEC Use GRE Protocol

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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Cisco VPN :: 1921 - IOS L2TP IPSec With Windows VPN Client

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 dport 500 sport 987 Global (N) NEW SA
*Apr  8 10:56:47.018: ISAKMP: Created a peer struct for, peer port 987
*Apr  8 10:56:47.018: ISAKMP: New peer created peer = 0x3296C24C peer_handle = 0x80000068

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Cisco WAN :: 1941 - L2TP Client-Initiated Tunneling

Aug 12, 2010

I am trying to configure L2TP Client-Initiate Tunneling on a cisco 1941 with C1900 Software (C1900-UNIVERSALK9-M), Version 15.1(2)T0a, RELEASE SOFTWARE (fc1).
I have two 1941 and trying to tunnel the VLAN's across a point to point T1 connection.  The reason for this is because one of the vlans on the remote end needs to be in a DMZ.  The problem that I am having is that is allows me to setup the l2tp class but the pseudowire-class command is not available.  Is there somthing I am missing? According to Feature Navigator L2TP Client-Initiate Tunneling is available in the IOS I am using

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Cisco WAN :: L2TP On 1921 With EHWIC

Mar 3, 2013

I have an 1921 that I use for L2TPv3 tunnel connection with 2 sides. I need to add others 2 sides and I thought to add an EHWIC-4ESG on my router. Can I configure different xconnections with this module? I would like to configure my router as below: [code]

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Cisco WAN :: Configure 861 Router To Use L2TP Protocol To Communicate FE Port To ISP

Apr 21, 2011

The router 861 Fast ethernet  have support for wan protocol L2TP ?
Can I configure the router to use L2TP wan protocol to communicate the wan FE port to my ISP ?
If yes  wath is the way ( CLI or Cisco E[press Professional Configurator ?)

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Linksys Wireless Router :: What Is Maximal Speed For E4200 L2tp Protocol

Oct 15, 2011

What Is Maximal Speed For E4200 l2tp Protocol.

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Cisco VPN :: Tunneling IPSec Through A 6509?

Mar 27, 2011

Is it possible to tunnel IPSec through a 6509 with an FWSM installed without the packets being interferred with?My question arises because myself and a colleague were attempting to form an IPSec tunnel in just this environment last week and no amount of resetting policies, key phrases etc would allow the tunnel to come up. The 2821 was complaining about Phase 2 not matching but the policies were definitely matching and configured the same on both ends. If there shouldn't be an issue with the 6509 and the FWSM then I will post configs from both ends. The 6509 is configured to all all ports through for the two IP addresses for now and is performing a one-to-one NAT for the PIX that is behind it.

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Cisco VPN :: PIX 501 - L2TP Over IPSEC VPN Connection

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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D-Link DIR-655 :: How To Get L2TP / IPSEC VPN Going On One Server

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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Cisco VPN :: L2TP / IPSEC Not Working In Windows 7

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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Cisco VPN :: 7200 - L2TP Over IPSec With Draytek

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, 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 (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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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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Cisco VPN :: Setting Up L2TP / IPsec VPN To ASA 5510

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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Cisco VPN :: ASA 5510 - VPN L2TP / IPsec Error 691

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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Cisco Security :: Internet Access Through IPSec VPN To PIX 501 Without Split Tunneling

Feb 17, 2007

setup CE500-24TT switch Port FE2 router / ports FE1,3-24 desktop / Ports GE1-2 Switch ports - MAC filtering is NOT enabled

FE1 - Cisco PIX501
FE2-24 Desktops/Printers

G1 - Empty
G2 - 8 port Gig Switch

8 Port G Switch = SBS2008 / Win2003 with Citrix / Win2K8 Management Server - plus a couple of desktops for Gig to server accessIs it possible to configure a PIX 501 to allow internet access for a Cisco VPN Client 4.8 without Split tunneling.The idea would be to have all raffic traverse the tunnel, be routed out the local WAN link on the PIX and then have the reply be forwarded back to the client over the IPSec tunnel.

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Cisco VPN :: 2921 Virtual-ice Independent Instances For Ipsec Tunneling

Sep 28, 2011

I have one Cisco ISR 2921 with VPN module. I'd like to be able to use it in order to "virtual-ice" independent instances for ipsec tunneling.
What I need is something like Asa security contexts, but the problem with Asa contexts is that don't support Vpns.
I'd like to use something like independent crypto maps, so if I need to take one down, or reconfigure, I need the others to keep working. It'll be for a production environment that must be up 99.9999

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Cisco VPN :: Can 881 Router Create L2TP / IPsec Tunnel Via NAT

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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Cisco VPN :: ASA 5520 - L2TP / IPSEC Not Working In Windows XP / 7

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 =, IKE_DECODE RECEIVED Message


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Cisco Routers :: Is L2TP Over IPSEC VPN Supported In SRP 521w

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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Cisco Security :: Change Ipsec Vpn To L2tp Over ASA 5510

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 this nat is true for l2tp over ipsec vpn? 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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Cisco VPN :: 1841 - Android Smartphone L2TP IPSEC On IOS

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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Cisco VPN :: ASA5520 - IPSEC Tunnel On Android Comes Up But L2TP Doesn't

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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Cisco VPN :: ASA 5505 Firewall - IPSEC / L2TP Vpn Hang After Some Time

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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Cisco Firewall :: L2TP IPsec Doesn't Work On ASA 5510

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

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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Cisco VPN :: Forward L2TP IPsec 5510 Requests To ForeFront TMG Server

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.

ASA 5510 (outside interface is ISP IP address, inside interface is TMG (outside nic, 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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Cisco VPN :: Configuring L2TP IPSEC VPN On ASA 5505 / Can’t Ping Or Access Resources

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


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Cisco VPN :: 1841 IPsec Tunnel Protocol Down After A Minute?

Apr 23, 2013

I have a strange issue where im able to get an ipsec tunnel from tha cisco 1841 to a linksys/cisco RV016 for about a minute and ping/encrypt packets across the lin for about a minute before it goes down. I tried various configuration and it all results in the tunnel coming up for a minute then going down. I'm not sure if im hitting a bug and on which decide of if im doing something wrong. 
RV016 firmware 2.0.18
cisco 1841: C1841-ADVENTERPRISEK9-M), Version 12.4(24)T
my config
no crypto isakmp default policy
crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
group 2


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Cisco Switching/Routing :: Nexus 7010 / 5510 - Run OSPF As Layer 3 Routing Protocol Between VPC Peer Links

Mar 25, 2012

I have an environment where i have two nexus 7010 switches, along with 2 nexus 5510's. I need to run OSPF as a layer 3 routing protocol between the vpc peer links.  I have 1 link being used as a keep alive link, and 3 other links being used as a VpC link.
1) Is it best to configure a separate Vpc VLAN i.e 1010

2) Is it best to configure a vrf context keep-alive

3) just have the management address as the peer ip's.

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Cisco VPN :: 4500 Switch - Dot1q Tunneling Via PPTP IPSec VPN Site-to-site Tunnel?

Nov 28, 2012

I have a situation where the site-to-site tunnel is already established using PPTP IPSec VPN with non Cisco Gateways terminating the link on each end. These non Cisco Gateways do not support L2TP tunneling, and there is no plan to change them.Beyond the Gateways on both ends, we have a Cisco 4500 series switch. We need to forward the 802.1q tagged VLANs between the two sites. Is it possible to use 802.1Q tunneling in this case, going via a PPTP tunnel ?
Cisco's setup uses dot1q-tunnel over a L2protocol-tunnel to preserve the original client VLAN tagging, so does this mean that the only option we have is to setup a L2TP tunnel at the Cisco device endpoints, and have that tunnel go through the existing PPTP tunnel (established between the 2 non Cisco VPN Gateways) ?

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Cisco VPN :: 1921 Router Q - How Many IPsec Tunnels Will It Support

Nov 8, 2011

I need to know how many IPsec VPN tunnels one Cisco1921 can support reliably. Haven't had any luck sifting through documentation on the web.

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Cisco VPN :: 1921 - No Local Network / Internet While On IPSec VPN

Dec 28, 2011

I am testing a EasyVPN IPsec server set up on a cisco 891. Here is how I have it set up right now- the 891 is connected to our backup internet connection (different ISP from our main line) and we have a cisco 1921 as our production router.
I am experiencing a problem where when I am on our internal network off the 1921 and I connect to the VPN on the 891 I lose all local network connectivity. Nothing works, can't ping, can't telnet to the 1921, can't browse the internet, its not just DNS either.
I believe the issue lies in the configuration of the IPSec server on the 891 because when I connect to our client's cisco IPSec VPN I experience full local connectivity with no issues whatsoever. It seems to me that ALL traffic is being routed through the tunnel.
Other than the local issues the VPN is working fine and I can remote desktop to the PC I have set up off the 891 and telnet to the 891 from there.
Current configuration : 8967 bytes
! Last configuration change at 20:45:17 UTC Thu Dec 29 2011 by admin
! NVRAM config last updated at 19:52:26 UTC Thu Dec 29 2011 by admin
version 15.0
service timestamps debug datetime msec


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Cisco Routers :: RV082 V3 Load Balancing (Protocol Binding) With IPsec Tunnel?

Mar 14, 2013

We have tried a variety of options in an attempt to use Load Balancing (Protocol Binding) with an RV082 that has a site to site IPsec tunnel with another RV082. Both are v3.
Here is the issue. We have dual ISPs, one has great bandwidth, but we incur overages. The other has mediocre bandwidth, but has unlimited usage.
GROUP1 - We want most PCs to use the "unlimited" ISP for general surfing, email, etc. (Bound all ports for range of internal IPs to ANY dest to WAN1)
GROUP2 - We want to use the "faster" ISP for our VPN tunnel (mostly RDP and SIP traffic). (Bound all ports for range of internal IPs to ANY dest to WAN2)
So far everything works. The router will route traffic appropriately and GROUP 1 uses WAN1 and GROUP 2 uses WAN2.
Unfortunately, sometimes GROUP1 users need access to resources over the VPN (WAN2).
There is something not right with the routing. For example GROUP1 can ping and receive responses from devices on the other side of the tunnel, but GROUP1 can't access intranet sites on the other side of the tunnel. They also can't RDP to PCs on the other side of the tunnel.
Why does the router correctly route ICMP, but not RDP?
We've tried adding additional protocol binding rules for specific ports(80, 3389, etc) and ip ranges (both local and remote) to see if we could force GROUP1 traffic destined via VPN through WAN2, but it doesn't work.
Shouldn't VPN tunnels created and configured in the RVs not adhere to protocol binding? It just seems logical to me, but maybe I am missing something.

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