Cisco WAN :: 3845-2 - IPSEC From Behind ADSL Modem

Apr 9, 2013

I'm trying to set up an IPSec tunnel between 2 3845 routers that each sit in a private LAN behind an ADSL modem.  Each modem does have a static public IP address from the ISP.
 
Thus:
 
Cisco 3845-1 <-> ADSL modem <-> WAN <-> ADSL modem <-> Cisco 3845-2
 3845-1 
Gi 0/0 - private ip
l
NAT

[code]....
 
So I would like to set up IPSEC between the GI 0/0 interfaces on the 3845's.

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Cisco WAN :: 3845 - GRE Over IPSEC With Encryption Module

Jun 21, 2011

To configure the GRE tunnel over IPSEC with OSFT via Encryption module from Cisco Router 3845, I have few queries:
 
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Cisco WAN :: 3845 - IPSec Encryption Overhead

May 5, 2010

How to reconcile what I've observed on our routers  on a tunnel interface.  The maximum amount of data I can get across the tunnel is 1339 bytes, which seems just a little bit too small. Background: we have two 3845 routers with IOS 12.4(3a) advanced ip services. I have tunnel interfaces on both routers, interface configs are below.
 
crypto ipsec transform-set MY_TSET esp-3des esp-sha-hmac comp-lzs crypto ipsec profile MY_VTIset transform-set MY_TSET
[ Code]..
 
When I test the mtu of the source destination interfaces I get 1500 bytes, as you would expect from an Ethernet connection to a service providers MPLS network. See output below:
 
Router1#ping ip 10.252.0.18 df-bit size 1500
[Code]...
 
When I test the mtu of the tunnels I get 1339 bytes, see the output below.
 
router1#ping ip 10.1.40.133 df-bit size 1340
Type escape sequence to abort.Sending 5, 1340-byte ICMP Echos to 10.1.40.133, timeout is 2 seconds:Packet sent with the DF bit setM.M.MSuccess rate is 0 percent (0/5)
[Code]...
 
That comes to a total of 1420, which is 80 bytes short of the mtu of the source/destination interface of the tunnel.

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We have an ASA5520 configured with a IPSec VPN, from any ADSL home/office our VPN clients can connect without any problem, but when we use our cellular phones in tetering mode (as an accesspoint) our VPN clients are impossible to connect. Same machines,same software, same operating system, same remote IP (ASA5520 external IP) only change Wifi connection (ADSL to cellular phone). The signal of cellular phones is not the problem we was doing the tests with different phones (IPHONE & ANDROID), different locations (all in spain) and differents providers (vodafone, orange and movistar) of internet by cellular phone.We think that perhaps the problem is the licenses that our ASA5520 has..

Our ASA5520 comes with this licenses:
------------------------------------------------------------------------------------------
Licensed features for this platform:
Maximum Physical Interfaces       : Unlimited      perpetual
Maximum VLANs                     : 150            perpetual
Inside Hosts                      : Unlimited      perpetual
Failover                          : Active/Active  perpetual

[code]....

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My Virtual Template config
 
interface Virtual-Template1
mtu 1440
ip unnumbered Loopback3

[Code].....

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[code]....

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Region : UnitedKingdom
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Hardware Version : Not Clear
Firmware Version :
ISP :

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