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-rw-r--r--src/vnet/tcp/tcp_cli.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/vnet/tcp/tcp_cli.c b/src/vnet/tcp/tcp_cli.c
index c7b5c0b441e..c9d6c6facd6 100644
--- a/src/vnet/tcp/tcp_cli.c
+++ b/src/vnet/tcp/tcp_cli.c
@@ -411,6 +411,8 @@ tcp_configure_v4_source_address_range (vlib_main_t * vm,
return VNET_API_ERROR_NEXT_HOP_NOT_IN_FIB;
sw_if_index = fib_entry_get_resolving_interface (fei);
+ if (sw_if_index == (u32) ~0)
+ return VNET_API_ERROR_NO_MATCHING_INTERFACE;
/* Configure proxy arp across the range */
rv = ip4_neighbor_proxy_add (fib_index, start, end);