Cisco VPN :: 1841 / Establish VPN With GRE Over IPsec
Nov 20, 2011
I want to establish VPN with GRE over IPsec. As ASA can't end GRE tunnels, I should pass it through inside to another 1841 router in datacentar network. Since datacentar is connected to internet via two wan links (separate ISPs) is it possible to establish two gre simultanous sessions between 1841 at branch office and 1841 at datacentar, one session per wan link at datacentar? That way, I need 8 gre separate sessions (tunnels) at datacentar 1841 router. Is it supported?Is GRE passthrough works like regular port forwarding or it is something that ASA handles with some special commands?
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Feb 7, 2011
I am facing problem when trying to establish VPN connection between ASA and 1841 router. Peer comes up but traffic is encrypt and decrypt. when assign route (ip route 192.168.x.0 255.255.255.0 fa0/0) to remote local subnet there is a traffic but one reply and one drop
ping from
192.168.y.62
-------------------------------------------------
Reply from 192.168.x.55: bytes=32 time=493ms TTL=127Request timed out.Reply from 192.168.x.55: bytes=32 time=633ms TTL=127Request timed out.Reply from 192.168.x.55: bytes=32 time=375ms TTL=127Request timed out.Reply from 192.168.x.55: bytes=32 time=528ms TTL=127Request timed out.
[code].....
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Aug 22, 2011
I´m getting a dynamic public IP from my provider and what I´m trying to do is to establish a remote vpn tunnnel using IPSec which I achieve but every time the sessions resets or the ASA 5505 resets I get a new public IP and I need to put the new IP on the remote client so I can establish the vpn... How can I establish an ipsec vpn using DNS? For this scenario the remote vpn client is a vpn phone but it could be for any vpn client.
Private IP Public IP Private IP
PBX ---- (LAN) ---- ASA 5505 ---( Internet ) --- Remote Site ( Router ) --- (LAN) -- VPN Phone
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Dec 29, 2011
We have to configure our firewall cisco Asa 505 (ASA Version 8.3(1)) in order to establish a ipsec vpn between our office site and another external site. Vpn has been established successfully between our ip site 172.16.69.24 and other vpn ip site 172.16.23.23.Our server (192.168.100.25) behind firewall cisco (sk lan 192.168.100.254) manages to ping server 172.16.23.23 on other site through a static route add on windows so server (route add 172.16.23.0 MAK 255.255.255.0 192.168.100.254).On the other site, server with ip 172.16.23.23 doesn't ping our vpn ip site (172.16.69.24) which has to be natted to our server 192.168.100.25.
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Jul 18, 2012
I have a client that needs to establish a IPsec tunnel to a large organization. They will not forward any traffic to an IP using private reserved IPs. However I am not finding another way to accomplish this. I tried ipsec to the router and using a second IP to a 1:1 Nat but it will not pass the traffic and would seem really insecure from the public internet. 1:1 Nat does work from the public internet but not over the tunnel.I have an RV042 a /29 block of IPs. I am at a loss of how I can accomplish what they want without allowing a private IP.
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Mar 31, 2011
i'm triyng to establish a vpn ipsec tunnel between my cisco2801 and a cyberoam equipment, at the end point.Debugging isakmp, i have this output, where xxx.xxx.xxx.xxx is the remote peer address, and yyy.yyy.yyy.yyy is mine.What can i try?
Apr 1 14:48:12.542: ISAKMP:(0): SA request profile is (NULL)Apr 1 14:48:12.542: ISAKMP: Created a peer struct for xxx.xxx.xxx.xxx, peer port 500Apr 1 14:48:12.542: ISAKMP: New peer created peer = 0x661C2D4C peer_handle = 0x80000003Apr 1 14:48:12.542: ISAKMP: Locking peer struct 0x661C2D4C, refcount 1 for isakmp_initiatorApr 1 14:48:12.542: ISAKMP: local port 500, remote port 500Apr 1 14:48:12.542: ISAKMP: set new node 0 to QM_IDLE Apr 1 14:48:12.542: insert sa successfully sa = 66DF4F5CApr 1 14:48:12.542: ISAKMP:(0):Can not start Aggressive mode, trying Main mode.Apr 1 14:48:12.542: ISAKMP:(0):found peer pre-shared key matching xxx.xxx.xxx.xxxApr 1 14:48:12.542: ISAKMP:(0): constructed NAT-T vendor-07 IDApr
[URL]
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Feb 17, 2013
We have configured a site to site tunnel from our ASA to another organizations Cisco 3030. It appears to have just one way initiation. We can do a ping to a device on the remote site and it will ping just fine. however, when the tunnel needs to be initiated from the remote site, it will not work until we have initiated the tunnel and then everything works.
I continue to see Error processing payload: Payload ID: 1 errors on the ASDM logs.It appears that all the configuration is in place because we can in fact establish the IPSec tunnel unidirectional. And once established, traffic can flow bidirectional.
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Mar 25, 2011
i have 6 sites using tandberg visioconference system, each site have a cisco router 1841 configured with ipsec vpn, i have a 4 conference a week and my bandwidth is 2 meg, and when people are working we have a lot of problems and cut in our visio conference.
I have a big problem, i want to make a high level QOS priority to my TANDBERG visio conference system between my sites, the issues is that there is an IPSEC VPN in my cisco routers between those sites and as i know if the traffic is crypted we can not separate the packets or give higher priority to packets over anothers.
can i mark traffic in the lan interface and and make a high priority befors the packets go through the ipsec tunnel?
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Jul 10, 2012
I am trying to establish a connection with an already existing IPsec VPN for file sharing. I click on the icon and get error messages when I type the correct username and password. I also entered the shared secret key correctly. I do not know where to enter the "group" name that coincides with the key I was given.
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May 28, 2012
I am now having trouble to buil a vpn ipsec on an adsl link, my architecture is as follow:
[code]...
whith this output, debbuging seems very difficult. see attached my configuration on router 1841
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Feb 10, 2011
I need support regarding IPSEC - VPN in 1841 Router? I had purchsed 1841 Router and i dont know how to check, whether supported for VPN or not?
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Aug 4, 2012
We have set up a site to site IPSEC VPN between a Pix 515E running 8.0 (4) and an 1841 using static IP addresses at both ends. We used CCP on the router and ASDM on the pix to build the initial tunnels. Now the site with the router is changing to a Dynamic IP address from the ISP so we have set up Dynamic DNS to update the dynamic IP address.
The problem we have is that ASDM will not allow us to set a domain as the peer address, it will only accept an IP address. We think the solution will be to remove the static Crypto Map and replace with a Dynamic Crypto map on the Pix side. Our questions are simply; is this the best solution? can we edit the original static list or is it better to delete and make a new dynamic crypto map? Is there a short cut to change the config in command line? This is a live network so just want to check before we make changes on live kit.
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Mar 17, 2011
I have a data center with virtual desktops and other shared infrastructure serving remote sites, some of which are connected to the data center with GRE over IPsec.
IP address management including DHCP is centralized in my architecture, but I simply cannot figure out how to relay DHCP requests through GRE over IPsec to my DHCP server cluster. I am working with Cisco 800 series VPN peers, and the VPNs are terminated either on a 1841 or a Juniper SRX. Everything else is just fine and dandy, but DHCP is not forwarded across the GRE tunnel.
As a workaround I am forced to use local DHCP pools on the VPN peers, which is extra work from a management point of view, and also precludes static IP address assignment where a local DHCP pool is in a VRF. My LAN devices are mostly thin clients, so I don't care if DHCP stops working when the WAN link fails. As such local pools have no upsides, they are only a tremendous hassle.
My config is very basic, public WAN in global routing table and WAN + GRE tunnel in a VRF. NAT is not used. Here are the DHCP-related configs I have tried:ip helper-address on the LAN gateway, both with and without ip forward-protocol udp bootpcip dhcp pool with relay options configured
In every case, I can see the UDP broadcasts hit the LAN gateway, but relayed packets never arrive at the other GRE tunnel endpoint let alone the DHCP server.
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Oct 23, 2012
We are currently experiencing a problem on an IP SEC VPN tunnel that has all of us here completely stumped. We are hoping that one of you experts out there will be able to assist. Here are some basic details:
NETWORKS
An IPSEC site to site tunnel has been built between the two sites on different networks.
PIX 515E - MAIN SITE
Network 172.16.0.0/24
CISCO 1841 - REMOTE SITE
Network 172.16.99.0/24
ISSUE
All traffic flows over the VPN from the 172.16.99.0 network in the direction of the Pix, such as RDP, SIP etc. Pings will go in both directions across the tunnel. Other than the pings most traffic will NOT flow over the tunnel from the 172.16.0.0 network on the pix to the 172.16.99.0 network on the 1841. It would appear that something on the 1841 is blocking traffic coming in over the tunnel from the 172.16.0.0 network as we can not get a wire shark capture on a PC on the 172.16.99.0 network, other than the ICMP traces. Usually this is an access list problem but we have checked and double checked the configuration and can't see anything.
TROUBLESHOOTING SO FAR
1. Have tried inserting various access list changes to the tunnel on the 1841 to make specific reference to the 172.16.0.0 network.
2. Have tried various NAT entries.
3. Have removed and then recreated the VPN tunnel from a fresh start.
4. Have made the MTU 1400 on the inside interfaces on the Pix and the 1841.
The tunnel is fully up at all times and as we say can ping in both directions.
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Jul 15, 2012
im trying to configure IpSEC over Gre tunnel, but the traffic pass unencrypted, i cant find why this is happening. Here are the confg of the two routers (1841)
OFICINA#sh run br
Building configuration...
Current configuration : 1281 bytes
!
version 12.4
service timestamps debug datetime msec
[Code].....
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Oct 23, 2012
I have a 1841 router connected to an ISP (currently SDSL EFM 10Mbps through an ISP modem, the router and the model are connected with a FastEthernet interface). On another location I have a linux server.There is an ipsec tunnel (3des-sha esp) between the router and the linux server (actually done with a crypto mac).The router has a hierarchical QOS policy on the egress interface.When sending traffic from the network inside the router to the linux host without the ipsec tunnel, everything is working fine and throughput is correct.When sending traffic from the inside network to the linux host internal ip through the ipsec tunnel, some packets are lost and the traffic throughput decrease.When sending traffic through the tunnel in the reverse direction (from the linux host to the internal network), everything is fine.I looked at the QOS statistics and the dropped packets counters don't increase. I looked at the egress/ingress interface statistics and no packets dropped there.I lowered the MTU on the egress interface, but it didn't solve the problem. I played by sending various ping icmp packets size, but even small packets are sometimes lost.I tried to check the router CPU, but it seems relatively fine (<= 10%)I captured the traffic on both side, and I see the packets emitted, and then I can see that some of the esp packets of the corresponding side are not received, so it looks like the cisco router is the culprit. This 1841 router is running: 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(24)T4,How can I troubleshoot where and why those packets are lost?
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Aug 9, 2011
Network Setup
===========
2 Site to Site VPN tunnels has been established, it is a hub and spoke topology. The hub is ASA5520 and the 2 spoke are a 1841 and 1801 router. The tunnel is able to pass traffic, it's a full tunnel VPN.The tunnel randomly disconnect for no reason. When I check the logs I can see some errors :
%CRYPTO-4-RECVD_PKT_INV_SPI: decaps: rec'd IPSEC packet has invalid spi for destaddr=x.x.x.x, prot=50, spi=0x5F822579(1602364793), srcaddr=y.y.y.y
%CRYPTO-4-IKMP_NO_SA: IKE message from y.y.y.y has no SA and is not an initialization offer
The actual address have been replace by x.x.x.x and y.y.y.y. I frequently have to peform clear crypto isakmp on the spoke routers to revive the VPN tunnels. Is there a way the tunnel can be re-establish again without manual intervention?This keep happening on a random basis and I have living with it for years. I have looked at cisco website troubleshooting tips and but no luck in finding out how to resolve it.
Below is my config on one of the spoke router:
==================================
Cisco IOS Software, C180X Software (C180X-ADVIPSERVICESK9-M), Version 12.4(24)T3, RELEASE SOFTWARE (fc2)
crypto isakmp policy 10encr 3deshash md5authentication pre-sharegroup 2crypto isakmp key @@@@@@ address y.y.y.ycrypto isakmp invalid-spi-recoverycrypto isakmp keepalive 30 periodiccrypto isakmp nat keepalive 20!!crypto ipsec transform-set tset1 esp-3des esp-md5-hmaccrypto ipsec df-bit clear!crypto map ipsecvpn 10 ipsec-isakmp
set peer y.y.y.yset transform-set tset1match address vpn@spoke!archivelog config hidekeys!!!!!interface FastEthernet0ip address x.x.x.x 255.255.255.248ip nat outsideip virtual-reassemblyduplex autospeed autocrypto map ipsecvpn!interface FastEthernet1!interface FastEthernet2!interface FastEthernet3!interface FastEthernet4!interface FastEthernet5!interface
[code]....
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Feb 23, 2011
I have 3 sites. Each site has a Cisco 1841 as its WAN router with a 10Mb direct internet access circuit connected to Fa0/0. The sites are then connected to each other via site-to-site IPSEC VPN. (The LAN switches in use at each site are Cisco 3750 series) [code]
Now, Site A has already been set-up with VoIP telephony. The plan is to extend this to the other 2 offices.Auto QoS has been set-up on the switches and data and voice VLANs created in the same way for each office.
how should/do we extend the QoS for the voice over the WAN to ensure voice quality remains for site to site calls. And what special considerations do we have to make for it being IPSEC VPN connectivity between the sites? The actual IP telephony system itself is being set-up by a 3rd party and not a lot of information on their requirements has been forthcoming so far – essentially all we have really been told is that they would like us to “reserve” a certain amount of bandwidth for the voice traffic between each site.
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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
[code]....
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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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Feb 2, 2011
I am exploring the possibility of having Cisco 1841's (or higher) at multiple sites. Each router will support 2 x ADSL connections (HWIC-1ADSL cards). My plan is to set up a DMVPN Full Mesh Tunnel on the first ADSL interface on each router and have RIP route these subnets, this will be for my Voice traffic only.
Further more I would like to set up a second IPSEC VPN tunnel between the head site and all other sites (the sites do not require direct communication for data purposes). This will route via static/weighted routes.
Any similar set up or sample configurations?
whether or not you can also run parallel DMVPN full mesh tunnels on a Cisco 1841 as this would be the other option.
the only restrictions are that the ADSL links cannot be upgraded to SHDSL etc.
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Apr 29, 2013
I tried any type of combination and just couldn't make it works. Only PPTP works well. Whether Apple iOS IPSec VPN is supported or not?
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Mar 8, 2011
i try to Access ACS5.2 installed on VM via SSH. I used 3 different SSH Clients, Teraterm, Sec CRT and Putty, all failed. Putty failed after (correct) password, Teraterm and SCRT failed with a Popup and the List of ACS Supported Modes (DH Group 14, AESxxxCBC ...). I configured them in the Options, but failed again.
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Feb 19, 2013
Am having 2621 router, going to upgrade to gh speed wan interface card(HWIC-4ESW). whether it can able to handle routing as like a normal serial and ethernet interface? Shall i establish a new MPLS or Leased line connectivity in that interface(HWIC-4ESW) ?
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Jul 9, 2012
I'm trying to establish a BGP neighborship with my ISP using my own ASN. The thing is that AS is a 32bit AS. I read on others papers that since the IOS 12.4(24) the support for ASN 4byte(32bits) was introduced. For some reason I cant enable BGP under an AS32bits on my 2811.
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(24)T1, RELEASE SOFTWARE (fc3)
BGP-AS32(config)#router bgp ?
<1-65535> Autonomous system number --> Only 16bits
<1.0-XX.YY> 4 Octets Autonomous system number
BGP-AS32(config)#router bgp 262477
^
% Invalid input detected at '^' marker
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Dec 1, 2011
I am having an issue with a VPN tunnel in that we can only establish this from the VPN 3k side to the 2800 and not from the 2800 to the VPN 3k , the setup is as follows: [code] I am awaiting the logs from the VPN 3k but here is the debugs from the 2800. [code]
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Mar 7, 2011
how to establish a LAN connection in windows7, am facing a problem ie. i couldn't ping my own IP.
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Oct 20, 2011
I want to establish a key for my computor to preclude neighbors from using my system. How?
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Feb 27, 2012
I have installed and setup cisco anyconnect on a win2008 server. It is able to authenticate successfully but upon trying to establish the vpn connection to the asa5520, it shows "unable to establish vpn". Other servers and pc from the same remote site is able to establish the vpn.
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Mar 10, 2011
On my PC laptop, when we try to connect to the internet (wireless router) through firefox we get the error message"Firefox can't establish a connection to the server @ cn-us.start3.monzilla.com. When we try using Window explorer we get "Internet Explorer can't display webpage" When prompted to click on "diagnose connection problem" it states Windows did not find any problems with this computer network connection.
A couple of points... the connection indication at the bottom states the laptop is connected to the internet. (WLAN ON)I have a Mac that is connected to our internet and doesn't have any problems.We have Windows Vista on the PC laptop
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Apr 26, 2011
I too am having a problem establishing a secure connection for Dropbox, Adobe update and just about every website I try to access via Firefox or Chrome comes up as unsecure. I can add exceptions, but I would rather access them securely.
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Dec 20, 2011
I have tried to establish a VPN-Connection from Ipad (via the Ipad built-in vpn-client) to a SA540.Unfortunately without any results. I get the message "Server is not responding". (A VPN Connection from a normal Software-Client running on W7 works fine).
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Feb 20, 2013
Something seemingly so simple is not working. A router and a Nexus are not seeing each other via CDP. I have a 2921 router connected to a Nexus 7000. Everything works fine, except for some mysterious reason CDP does not establish. Yes, it is enabled on both devices and not disabled on the relevant interfaces. The Nexus says this over and over again when debugging cdp errors:
[code]....
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