the automatic addition of IP address to the magic TAP interface should only happen for one table
#include <vlib/unix/unix.h>
#include <vnet/ip/ip.h>
+#include <vnet/fib/fib_table.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/devices/devices.h>
@@ -692,6 +693,16 @@ tuntap_ip4_add_del_interface_address (ip4_main_t * im,
if (tm->have_normal_interface || tm->dev_tap_fd < 0)
return;
+ /* if the address is being applied to an interface that is not in
+ * the same table/VRF as this tap, then ignore it.
+ * If we don't do this overlapping address spaces in the diferent tables
+ * breaks the linux host's routing tables */
+ if (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
+ sw_if_index) !=
+ fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP4,
+ tm->sw_if_index))
+ return;
+
/** See if we already know about this subif */
memset (&subif_addr, 0, sizeof (subif_addr));
subif_addr.sw_if_index = sw_if_index;
@@ -799,6 +810,16 @@ tuntap_ip6_add_del_interface_address (ip6_main_t * im,
if (tm->have_normal_interface || tm->dev_tap_fd < 0)
return;
+ /* if the address is being applied to an interface that is not in
+ * the same table/VRF as this tap, then ignore it.
+ * If we don't do this overlapping address spaces in the diferent tables
+ * breaks the linux host's routing tables */
+ if (fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP6,
+ sw_if_index) !=
+ fib_table_get_index_for_sw_if_index(FIB_PROTOCOL_IP6,
+ tm->sw_if_index))
+ return;
+
/* See if we already know about this subif */
memset (&subif_addr, 0, sizeof (subif_addr));
subif_addr.sw_if_index = sw_if_index;
