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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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 10, 2012
I did have a router cisco 1941 but can not do ipsec with it,i did take a smart net.
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Jul 1, 2012
We need to give TCP 3389 & 3399 priority over all other traffic between a Cisco 1941 and 2951.What is needed to do this?
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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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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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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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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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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 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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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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Jul 12, 2012
I am trying to set up a site to site ipsec connection. AT site A, I have Vlan's 652-10.55.216.0/24, Vlan653 -10.55.217.0/24, Vlan 654-10.55.217.0/24 and Vlan655-10.55.219.0/24 and at site B, Vlan650-10.55.214.0/24 and Vlan651-10.55.215.0/24.The problem is that I am unable to get any associations when i do a "sh crypto isakmp sa"/"sh crypto ipsec sa" on either router at each site.I am also unable to ping by pluging in a laptop into the site at each site. Laptop at site A is set to access vlan 655 and laptop at site B is set to acess vlan 651. I can ping all the devices from one end to the other.I have turned on debug crypto isakmp, debug crypto ipsec, debug crypto ipsec errors but dont get anything at all as output.I have attached the sh run for each router Cisco (1941/K9) and switch (Catalyst 3750) at each site.
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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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Oct 26, 2011
what license do I need to create a IPSEC tunnel? I have an ASR 1001, running? [code]
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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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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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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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May 20, 2013
I have an ASA5510 configuration that I'd like to add to.In this configuration there is a site to site IPSEC VPN tunnel to a remote location.It is tunneling a particular subnet for me and everything is working.In the remote subnet, there is an ASA 5525-x connected on the outside interface. Let's say for argument's sake, the outside IP is 210.0.0.1.On the Inside interface, i've configured 10.240.32.0/24 network.The only static route I have configured on the 5510 is the default gateway that goes to the ISP.I assumed that I have to add: route Outside 10.240.32.0 255.255.255.0 210.0.0.1 1.I did this, but i'm not able to reach the destination 10.240.32.0/24 network. I can't see anything hitting the 5525-x and the only thing I see on the 5510 is the building outbound ICMP and the teardown for the ICMP.
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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
i have a 7201 router with NPE-G2. i have a design which i have the option to send all the traffic through a GRE tunnel or a L2TPV3 tunnel.which method is more CPU consumption ?
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Apr 3, 2012
I am using a RV110W as a VPN client to establish a VPN conection since some months. So far everything works fine. But all traffic is routet thru the VPN tunnel. Now I try only to route specific adresses thru the tunnel but not the internet acess.
RV110W is in Gateway mode
WAN interface is connected with internet
I am using PPTP with PAP and MPPE for VPN
so far no static routes (I could not set e.g. a route to 0.0.0.0 because web-interface says its not a valid adress)
Goal is to route only traffic for the target network thru tunnel and the rest direct via WAN interface.
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May 23, 2013
We set up a 1941 Router with the Cisco Configuration Professional Tool. The VPN Tunnel works and i get an IP Adress from the pool. But i cant reach any devices in the VLAN10 Network. Do i forget anything ?
Here is the config from the Router:
version 15.1
parser view CCP_Monitor
secret 5 $1$FnN7$Qr.mbJbPOuOH7Te6MD1.I0
commands configure include end
[Code].....
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May 13, 2011
I have a Cisco 1941 router with the Security license running IOS c1900-universalk9-mz.SPA.151-4.M.bin. Is there a "tunnel bandwidth" command like with routers that have the Advanced IP Services license? My concern is being able to adjust the bandwidth to a value greater than 8 Mbps...
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May 7, 2012
I am having an issue authenticating users via 802.1x/EAP-TLS across an IPSec tunnel. I am using route-based VPN with SVTI configuration on a 2921 and 1941. I have the following settings defined:
- Under the tunnel interfaces:
- MTU 1390
- MSS 1350
- PMTUD
- Under the ingress LAN interface
- route-map to set the DNF bit to 0
- On the RADIUS Server (2008 NPS)
- Framed-MTU: 1300
This had been working for months until I got a call last week about users not being able to authenticate to our secured SSID. I fired up wireshark and also used my client monitor tool in my wireless NMS to watch what is going on. I see all of the access-request and access-challenge exchanges, but the final exchange never happens. In both captures you can see messages with id's 77-81, but message id 82 isn't shown in the wireshark capture, only fragments are. In the client monitor capture you can see that message id 82 is 1726 bytes in length. Now, if I capture packets on my local LAN, the 1726 byte packet is properly fragmented and users can authenticate just fine.
I have scoured the Internet trying to find a setting that I must have missed, but I can't. I've tried adjusting the Framed-MTU, all the way down to 1100.
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Jan 17, 2013
I need to unlock IPSec to my 1941 router but I'm not sure which license(s) to purchase.
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Aug 26, 2012
I am trying to set up a pair of 1941 routers in a HA configuration to act as L2L VPN gateways. The active router of the pair should distribute routes to the remote destinations using OSPF to internal routers. The VPN part is working fine and the routers are correctly advertising routes to internal hosts, however my problem is that when an IPsec sessions disconnect, the routes disappear and therefore internal hosts cannot reestablish a connection. If the remote end establishes a connection, the routes appear again and connectivity is restored.
My setup is as follows: (ASA) --> (pvpn01 & pvpn02 HA pair) --> (internet) --> (remote peer)
The other router in the pair has exactly the same config except with different interface IPs. The remote end is configured to talk to the HA address
91.216.255.248.The VPN routers are both running IOS version 15.0(1r)M9.
When I initially boot the routers, the route for 192.168.66.0/24 appears in 'show crypto route', and is advertised to neighboring routers. If I ping an address on that network an SA is established and stays active as long as there is traffic flowing. pvpn02#show crypto route
If I then stop traffic flowing over the tunnel and wait until the IPsec SA lifetime is expired, the route is deleted from the system routing table and therefore not distributed by OSPF. The result is that internal hosts cannot reestablish the tunnel as the other routers have no route to the 192.168.66.0/24 network.
Is this a bug, or is there another way to get the RRI routes to persist on the active router?
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May 17, 2011
I'm trying to configure a Cisco 1941 to connect to multiple Amazon VPC instances. Each VPC instance brings up 2 x IPsec over GRE tunnels with BGP in to the EC2 cloud and enables flat extension of the corporate LAN. Basically. you can spin up EC2 instances in a private subnet and route to them across the VPC link from the corporate LAN.
The Amazon configuration is templated and not designed to support multiple instances on one customer access gateway - however, I want to overcome this and find a technical solution around bringing up a second physical router. I've got VRF configured and working for the first instance, but when we add a second VRF to the configuration IPsec fails. The second VRF is essentially identical to the first.
We're potentially looking at a licensing issue with IOS 15.x, the version we're running is...
ipbase ipbasek9 Permanent ipbasek9
security securityk9 Permanent securityk9
data None None None
[Code]....
However, the IPsec configuration is complete and all keychains etc. are in place as they should be.
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Oct 10, 2012
I did purchase a router 1941 universal k9 but i can not do ipsec on it, i took a smart net for that router in order to have or download ipsec on it.
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Jul 24, 2012
Environment :linksys wrt300n v1.1 which can have ddwrt-mega. Willing to tunnel all lan's outbound traffic through an ssh tunnel.
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Jul 23, 2012
The setup is a S2S VPN with failover to 3G HWIC in a Cisco 1941 however the IPSEC tunnel needs to remain up through 3G if ADSL fails.The failover works ok, however when plugging ADSL back in, the - "sh crypto session" shows both dialer 0, and dialer 1 with the crypto map session to the other side of the VPN and either side is now not pingable.The NoIP DDNS updater client runs on a server in the network and all IP resolution to host1,host2 works ok (other side of VPN is Cisco 1921 with ADSL HWIC and 3G HWIC). [code]
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Jun 24, 2012
I have a 1941 router configured for Policy based routing with two ISPs.Two static default routes configured to point the gateways of respoective ISPs with same metric.But the problem is, packets are going throug the one ISP only while doing traceroute.
N/W connectivity:
ISP1-----> <----------------------> LAN1
| Router |
ISP-------> <----------------------> LAN 2
Below is my configuration :
Current configuration : 5958 bytes
!
! Last configuration change at 05:18:56 UTC Mon Jun 25 2012
!
version 15.0
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
[code]....
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Jun 16, 2011
I installed a 1941 router with an encrypted GRE tunnel yesterday. The router has ipbasek9 and securiyk9 licensed. Initially the router was running the image c1900-universalk9-mz.SPA.150-1.M5.bin and was working fine. The tunnel was up and passing traffic. I then upgraded the IOS to c1900- universal k9-mz.SPA.151-2.T2.bin and when I reloaded the router the tunnel was stuck in a reset/down state. I tried doing shut/no shut on the interface and reloading the router again, no change. Being under some time pressure to get the device back into production I rolled back to the previous IOS image and the tunnel worked fine again. Is there a known bug that causes this behavior? I have searched cisco.com but have not found one. [code]
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