Cisco VPN :: 1841 - IPsec Tunnel Two Way Traffic

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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Cisco VPN :: 1841 - Not Encrypting IPSec Over GRE Tunnel

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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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

[code]....

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Cisco VPN :: ASA Or 871 IPSec L2L To SSG-140 - Tunnel Is Up But No Traffic

Aug 8, 2012

i am curently troubleshooting a ipsec l2l VPN between
 
1. ASA 7.2(4) to SSG-140
2. Cisco 871W to SSG-140
 
In both scenario's the tunnel is nicely established, and traffic goes into the tunnel, but nothing comes out. All encap's, but no decap's                    
 
It seems like a routing issue, but we can not find anything on both sites.
 
So maybe i m running into a (known) issue between cisco VPN equipment and the SSG-140?
 
Could it be a proxy-id issue? Cause they configure stuff like 10.1.1.0/24 and i configure 10.1.1.0 0.0.0.255

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Cisco VPN :: 881 / Route Traffic Thru IPSec Tunnel To DMZ

Jun 29, 2011

I need to route traffic to DMZ (and internal) from the branch office thru the IPSec tunnel. How do I manage that with my Cisco 881?

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Cisco VPN :: ASA 5505 - IPSec VPN L2L Tunnel Up But No Traffic

Mar 19, 2011

I have a Site to Site IPSEC VPN Tunnel created with ASDM wizard.
 
Cisco ASA-5505
Peer A: x.x.x.x
Lan A:     192.168.0.0    255.255.255.0
 Fortinet FortiGate-50b
Peer B: y.y.y.y
Lan B:     192.168.23.0  255.255.255.0
 
I start traffic from LAN B with a ping (or telnet it doesn't matter) that receive no reply but tunnel goes up fine.
 
"show isakmp sa" seems ok (says "State   : MM_ACTIVE")
"show ipsec sa" seems ok but all #pkts are zero
 
try ftp, telnet from LAN B to LAN A systems but no one work. "show ipsec sa" all #pkts are zero As soon as I generate traffic from LAN A to LAN B these works (with tunnel already up) also traffic from LAN B to LAN A works.Obviously if I end VPN and start tunnel making traffic from LAN A all work fine bidirectionally, LAN A reach LAN B and LAN B reach LAN A.No msg logged in either two appliance.
 
Seems a very strange problem because seems not related to Phase1 or Phase2 already established.Traffic (routing ?) start works only after at least one packet goes from LAN A to LAN B.No msg logged in either two appliance.Problems begun in ASA version 8.0(4) ASDM version 6.1(3) and remain/continue after upgrade to ASA Version 8.4(1) ASDM version 6.4(1).

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Cisco VPN :: 881 / Route All Traffic Over IPsec Tunnel?

Jan 30, 2012

We have 7 remote offices and 10 tower locations that utilize IPsec tunnels back to our HQ. We now want to force all traffic including web surfing through the tunnels. What would be the easiest way to acomplish this? I have tried utilizing the crypto map policy to do this, but was unable to acomplish this.
 
Each of our office locationss utilize a Cisco 2811 router and the tower locations utilize a Cisco 881.

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Jul 18, 2011

I currently have two Cisco ASA 5505.  They are at different  physical sites (SITE A, SITE B) and are configured with a site-to-site VPN which is  active and working.
 
I can communicate with the subnets on either site from the other and both are connected to the internet, however I need to ensure that all the traffic at my site B goes through this VPN to my site A.
 
I changed this access-list : access-list outside_2_cryptomap extended permit ip network_siteB network_siteA to access-list outside_2_cryptomap extended permit ip network_siteB any
 
But this does not work. If I do [URL], site B IP address  is not same that site A.

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Cisco VPN :: 5505 LAN-to-LAN IPsec VPN Tunnel Traffic Not Being Routed

Feb 24, 2011

I am trying to set up a LAN-to-LAN VPN tunnel between two sites.  One site has a 5505, and the other site has a 5510.  It looks like the tunnel is being established fine (both ISAKMP and IPSEC SAs look OK), but traffic doesn't appear to be routing across the internet between the devices. [code]

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Cisco Switching/Routing :: 1941 / IPSec Tunnel Up No Traffic?

Mar 7, 2013

I have an IPSec tunnel configured on my Cisco 1941. The other device is an ZyXEL router.I can see the tunnel is up but there is no traffic.This comes out the show crypto ipsec sa

interface: Dialer1
Crypto map tag: CMAP_AVW, local addr 10.10.10.89
   protected vrf: (none)
   local  ident (addr/mask/prot/port): (192.168.200.0/255.255.255.0/0/0)
   remote ident (addr/mask/prot/port): (192.168.150.0/255.255.255.0/0/0)
   current_peer 20.20.20.161 port 500

[code]....

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Cisco VPN :: Traffic Is Not Passing On Plain IPSec Tunnel Between Two 892s

Dec 14, 2011

I've replaced real networkID to the one mentined below.
 
Topology: classical IPSec VPN tunnel between two Cisco 892s, with pre-shared key and no GRE. One 892 (branch_892) has access to the Internet via PPPoE and has three networks/vlans behind it. One VLAN is NATed to access internet via the PPPoE. Access to two other VLANs - VL92 (100.100.200.0/24) and VL93 (100.100.100.0/24) need is done thrue the VPN tunnel.
 
Second 892 (892_DC) has just one interface - WAN on Gigabit enabled/connected and has a static route to the default GW. It does not have any interal network defined. So the router is strictly used to send traffic for VL92/VL93 to the branch 892 via IPSec tunnel.
 
Here is the problem: access to/from VL93 (100.100.100.0/24) works, however for VL92 (100.100.100.0/24) - does not.
 
From devices in VL92 I can ping the 892_DC IP address across the VPN tunnel. From the 892_DC router I can also ping devices in VL92. However I can no ping from VL92 any device beyond the 892_DC and at the same time packet arriving on 892_DC for VL92 are not sent out via the VPN tunnel.
 
I took the packet trace on 892_DC using capture point/buffer to capute packets for VL92 and could see that traffic does arrive at the 892_DC. I run the same capute on Branch_892 and there was not a single packet.More interesting I modified the access list such a way that left on VL92 and still - no packets are sent out thru the tunnel. [code]

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Cisco VPN :: ASA5500 / TCP State Bypass For Traffic - Coming From IPsec Tunnel?

Feb 6, 2012

We have problems on central firewall with restricting traffic coming from remote office from IPsec. (The network sheme is attached) All branch offices are connected to central asa though IPsec. The main aim is to rule access from branch offices only on the central firewall, NOT on each IPsec tunnel According to the sheme:172.16.1.0/24 is on of the branch office LANs10.1.1.0/24 and 10.2.2.0/24 are central office LANThe crypto ACL looks like  permit ip 172.16.1.0/24 10.0.0.0/8 the aim is to restrict access from 172.16.1.0/24 to 10.1.1.0/24 When packets are generated from host 10.1.1.10 to 172.16.1.0/24 all is ok -  they are dropped by acl2 When packets are generated from 172.16.1.0/24 to 10.1.1.10 they are not dropped by any ACL - the reason is stateful firewall - traffic bypasses all access lists on a back path I thought that TCP State Bypass feature can solve this problem and disable stateful firewall inspection for traffic coming from 172.16.1.0/24 to 10.1.1.0/24, but it didn't work.The central asa 5500 is configured according to cisco doc [URL] 
 
access-list tcp_bypass_acl extended permit tcp 172.16.1.0 255.255.255.0 10.1.1.0 255.255.255.0
!
class-map tcp_bypass_map
description "TCP traffic that bypasses stateful firewall"
match access-list tcp_bypass_acl

[code].....

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Cisco Routers :: RVL200 IPSEC Channel All Or Some Data Traffic Through Tunnel

Jan 2, 2013

Is it at all possible to channel all/some data traffic through an established ipsec tunneled connection using the RVL200? I have successfully established an ipsec connection through RVL200 and RV042 routers and are able to connect to servers/computers behind it.Now I want to channel all or some traffic through the ipsec-tunnel for computers that reside on 192.168.1.0 subnet of RVL200 network.
 
Main office - RV042 router - 10.200.62.1
Remote office - RVL200 router - 192.168.1.1
 
I am trying to use the Advanced Routing option to add static routes but I am not 100% sure if I am configuring the routes correctly.To give an example of routing DNS requests for HOTMAIL.COM [65.55.72.183]: [code]For some reason this does not appear to work. I have also tried using the interface setting of WAN and tested - this also does not work.

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Cisco Routers :: Rv220W / Assign Vpn Traffic To A Vlan When Setup An Ipsec Tunnel?

Apr 7, 2012

i'm using an rv220W and i whant to know if is it possible to assign vpn traffic to a vlan when i setup an ipsec tunnel?
 
example:
Im using different vlans on my rv220W.
Vlan 10: engineers (ex: 192.168.1.0/27) no intervlan routing
Vlan20: sales (ex: 10.0.123.0/24) no intervlan routing
 
 This is what i need:  - An engineer is on the road and when he makes a ipsec vpn connection => assignd to the vlan "engineers" so he can access the server/pc's in that vlan.and when someone from the sales group starts a vpn connection he needs to be in the vlan "sales" so he can access his pc/data,...

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May 31, 2012

This has to be the most weirdest issue I have seen since the past year on my ASA. I have an ASA 5540 running the 8.4(2) code without any issues until I stumbled upon this problem last week and I have spent sleepless nights with no resolution! So, take a deep breath and here is a brief description of my setup and the problem:
 
A Simple IPSEC tunnel between my ASA 5540 8.4(2) and a Juniper SSG 140 screen OS 6.3.0r9.0(route based VPN)
 
The tunnel comes up without any issues but the ASA refuses to encrypt the traffic but decrypts it with GLORY! below are some debug outputs, show outputs and a packet tracer output which also has an explanation of my WEIRD NAT issue:  

My setup - ( I wont get into the tunnel encryption details as my tunnel negotiations are **** perfect and comes up right off the bat when the ASA is configured as answer only)
 
CISCO ASA - IPSec networking details
LOCAL NETWORK - 10.2.4.0/28
REMOTE NETWORK - 192.168.171.8/32
JUNIPER SSG 140 - IPSec networking details
PROXY ID: LOCAL NETWORK - 192.168.171.8/32
REMOTE NETWORK - 10.2.4.0/28 
HOST NAME# sh cry ipsec sa peer <JUNIPER SSG PEER>
peer address: <JUNIPER SSG PEER>
[code]... 

As you can see, there is no echo reply packet at all as the packet is not being encapsulated while it is being sent back. I have been going mad with this. Also, this is a live production multi tenant firewall with no issues at all apart from this ****** ip sec tunnel to a juniper!!

Also, the 192.168.10.0/24 is another IP Sec tunnel remote network to this 10.2.4.0/28 network and this IP SEC tunnel has a similar Juniper SSG 140 screen os 6.3.0r9.0 at the remote end and this woks like a charm without any issues, but the 171 is not being encrypted by the ASA at all.

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Sep 23, 2012

I'm in process of purchasing a new Cisco routers for our branches that will be used primary to enable IPSec virtual tunnel interfce with "tunnel mode ipsec ipv4". does the default IOS IP Base supports this feature? or i need to purchase DATA license or SECURITY license?

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Oct 17, 2012

I am using a Cisco RV110W (Firmware 1.2.09) in a branch and I would like to create a VPN Tunnel to another site that has a Cisco RV042 (firmware v4.2.1.02)
 
What would be the correct Configuration? the current configuration I am using is
 
in the RV042 i am using
 
Check Enable 
Local Group Setup
Local Security Gateway Type : IP Only
IP Address : RV042 Pulbic IP address

[Code].....

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Jan 9, 2011

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Jul 24, 2012

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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.
 
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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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Apr 8, 2013

I have created the tunnel interface on cisco 1841 router. The tunnel is up but can't ping to it's interface ip, the ping drops.

R1#show ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
Tunnel10                   10.10.10.1    YES manual up                    up

[Code]......

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Mar 13, 2012

We have configure a L2L vpn between Asa and 1841 router. We are facing this issue.The tunnel is not getting up from the 1841 site never. When we are trying to generate traffic from the ASA site the tunnel is up and we can see decryps and encryps packets.
 
Router 1841 Config:
 
crypto isakmp policy 100
encr 3des
hash md5
authentication pre-share
group 2
crypto isakmp key * address 213.249.XX.XX

[code].....

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May 16, 2011

I m trying to make the vpn session using m GRE tunnel between cisco 891/k9 and 1841 router.. there is the fixed ip add with the 1841 router, and another one doesnt have the static ip from the ISP, In this case, im going to use  DMVPN, The problem is , after completing the configuration, the tunnel inteface of the 1841 router will be seen like this.
 
-status: reset
-protocol: down

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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 17, 2012

I need to work with the full tunnel feature of the IOS SSL VPN using a Cisco 1841. Here is what I see...
 
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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

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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.
 
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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.
 
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Oct 19, 2011

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Dec 15, 2010

I can ping across the tunnel from the pc's on either end of the tunnel, but I can't ping across the tunnel from the routers. If i ping using the source command using the LAN interface, the ping is successfull.
 
The reason i need this is for the remote router to be able to lookup the head office server for dns wins and ldap.

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Cisco VPN :: 1841 / 1801 - Random L2L IPSEC VPN Disconnect

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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