i constatly read to use Ipsec across your l2tp tunnels for true encryption (which ive slowly been adding to each of my many l2tp links), and that data flowing across a l2tp tunnel is NOT encrypted.
however i do not understand this line from the MT manual:
L2TP is a secure tunnel protocol for transporting IP traffic using PPP. L2TP encapsulates PPP in virtual lines that run over IP, Frame Relay and other protocols. L2TP incorporates PPP and MPPE (Microsoft Point to Point Encryption) to make encrypted links.
My question is, i have several MT to MT devices connecting private networks across L2TP tunnels ( said L2TP tunnels go across the internet ofcorse), IS the traffic flowing across these L2TP tunnels encrypted if for example someone were to sniff those l2tp tunnels as they cross the internet? the encoding on my mt to mt l2tp tunnels shows up as MPPE128 stateless (Microsoft Point to Point Encryption) so that to me says its encrypted....right or wrong??
[admin@xxx] /ppp active> pr
Flags: R - radius
# NAME SERVICE CALLER-ID ADDRESS UPTIME ENCODING
0 clxxx l2tp 174.6x.xxx.xx 192.168.4.117 6d8h2... MPPE128 stateless
1 prxxxx l2tp 64.3x.xxx.xx 192.168.4.156 6d8h2... MPPE128 stateless
2 raxxx l2tp 174.7x.xxx.xxx 192.168.4.124 6d8h2m8s MPPE128 stateless