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devip: replicate the nat-flag (Rtrans) when superceding interface route

Superceding interface routes is handled specially,
only incrementing reference count, but need to take
the new Rtrans flag into account.

--- a/sys/src/9/ip/iproute.c

+++ b/sys/src/9/ip/iproute.c

@@ -311,8 +311,10 @@

 		 */

 		if((p->type & Rifc) == 0)

 			copygate(p, new);

-		else if(new->type & Rifc)

+		else if(new->type & Rifc){

+			p->type = (p->type & ~Rtrans) | (new->type & Rtrans);

 			p->ref++;

+		}

 		freeroute(new);

 		break;

 	case Roverlaps: