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
>
>
>
