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commit 578db3f65caec301ceb402e5c7b51624ed1c4576 (HEAD, origin/master, origin/HEAD, master)
Author: Timo Teräs <timo.teras@iki.fi>
Date:   Thu Jul 11 14:14:15 2013 +0300

    peer: reset interface nat cie when server does not detect nat
    
    fixes a corner case that system had broken routing, it gets fixed
    without changing gre interface. for normal operation the nat cie is
    reset by gre interface change hooks.

diff --git a/nhrp/nhrp_peer.c b/nhrp/nhrp_peer.c
index 97bbe48..2dbdeea 100644
--- a/nhrp/nhrp_peer.c
+++ b/nhrp/nhrp_peer.c
@@ -1001,6 +1001,9 @@ static void nhrp_peer_handle_registration_reply(void *ctx,
 			peer->interface->nat_cie = *cie;
 		}
 	}
+	if (payload == NULL || cie == NULL)
+		memset(&peer->interface->nat_cie, 0,
+		       sizeof(peer->interface->nat_cie));
 
 	/* If not re-registration, send a purge request for each subnet
 	 * we accept shortcuts to, to clear server redirection cache. */