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-rw-r--r--src/plugins/nat/nat44-ed/nat44_ed.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/plugins/nat/nat44-ed/nat44_ed.h b/src/plugins/nat/nat44-ed/nat44_ed.h
index 5b5b2ec8cfd..6c64c754073 100644
--- a/src/plugins/nat/nat44-ed/nat44_ed.h
+++ b/src/plugins/nat/nat44-ed/nat44_ed.h
@@ -41,6 +41,11 @@
* as if there were no free ports available to conserve resources */
#define ED_PORT_ALLOC_ATTEMPTS (10)
+/* system ports range is 0-1023, first user port is 1024 per
+ * https://www.rfc-editor.org/rfc/rfc6335#section-6
+ */
+#define ED_USER_PORT_OFFSET 1024
+
/* NAT buffer flags */
#define SNAT_FLAG_HAIRPINNING (1 << 0)