Hi Marta,
I did try to add the said PIM commands to R1/KS.

Access-list 10 permit 239.0.0.1
ip pim rp-address 1.1.1.1 10
ip pim accept-rp 1.1.1.1

I’m still receiving rekeys via multicast on GM but errors on R1/KS still keep 
showing:

%PIM-6-INVALID_RP_JOIN: Received (*, 224.0.1.40) Join from 10.10.10.2 for 
invalid RP 1.1.1.1

It’s more of an attempt to understand the mechanics of how it all works 
together. I just hate to memorize how it should be done in every particular 
case.
It looks like this 224.0.1.40 address comes from PIM sparse-mode enabled on the 
tunnel or loopback interface.

From: Marta Sokolowska [mailto:[email protected]]
Sent: Tuesday, August 07, 2012 1:05 PM
To: Eugene Pefti
Cc: [email protected]
Subject: Re: [OSL | CCIE_Security] GETVPN multicast rekey through GRE tunnel

2012/8/7 Eugene Pefti <[email protected]<mailto:[email protected]>>

[...]
What drives me insane is that when I add mroute on GM I got the same error 
messages on KS. Where’s this 224.0.1.40 coming from ?

R2(config)#ip mroute 1.1.1.1 255.255.255.255 tunnel126

R1
*Aug  7 19:17:18.100: %PIM-6-INVALID_RP_JOIN: Received (*, 224.0.1.40) Join 
from 10.10.10.2 for invalid RP 1.1.1.1

Check if you have "ip pim rp-address 1.1.1.1" also on R1 (on the router which 
is KS). This message can be seen on the RP (in your case - on KS/R1) when the 
router doesn't have the "ip pim rp-address" command or auto-rp to announce 
configured (using "ip pim send-rp-announce" and "ip pim send-rp-discovery").

You can also try with "ip pim accept−rp 1.1.1.1" on R1 if you already have "ip 
pim rp-address 1.1.1.1" configured.

Marta Sokolowska.

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