As of IOS 12.4(20)T Cisco routers can send NetFlow data through an IPSec VPN tunnel. The flow exporter just needs to be configured with the output-features option. According to Configuring Data Export for Cisco IOS Flexible NetFlow with Flow Exporters this option “Enables sending export packets using QoS and encryption”. For example: flow exporter NFSVR [...]
I have a remote site on an ADSL connection using a Cisco 877 router. There’s an IPSec VPN back to my location. They connection speed is very good: Download Speed (kbps): 23410 Upload Speed (kbps): 1017 The ADSL router was configured with pretty typical MTU and MSS settings (probably copied off the Internet): interface Vlan1 [...]
Instructions I consulted a number of sites on the Internet when I was attempting to configure L2TP on a Cisco router. I found many people with the same issues I had but no complete solution. In the end, my problem was that I needed an access list (see access-list 130 below). Below is an example [...]