Multicast encryption using GDOI works well, although I haven't seen that implemented on a LAN. If you're trying to provide encryption for LAN listeners (more accurately to exclude some LAN listeners) you'll probably find more bang for the buck in implementing this on a per-application basis. That leaves the IGMP request subject to eavesdropping, but the data itself flows over a secure channel. If instead you want the IGMP itself to be encrypted, then you'll need all of the switches to participate in the security protocol, and I would imagine that there are far easier ways to provide secure connections. I believe GDOI is esp-only. Cisco's term for GDOI is GETVPN. -David Barak On Wed Dec 23rd, 2009 7:26 AM EST Peter Hicks wrote:
Glen Kent wrote:
Any idea if folks use AH or ESP to protect IGMP/PIM packets? Wondering that if they do, then how would snooping switches work?
Would encrypting multicast not fundamentally break the concept of multicast itself, unless you're encrypting multicast traffic over a backbone?
Peter