From db4383ddb33d28f211e7075dfe6ee27c2115930e Mon Sep 17 00:00:00 2001
From: Vincent Bernat <vincent@bernat.im>
Date: Sat, 9 Dec 2017 22:09:21 +0100
Subject: [PATCH] doc: add a word about Intel X710 with embedded LLDP daemon

---
 README.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/README.md b/README.md
index a73ae5e9..9d599c3d 100644
--- a/README.md
+++ b/README.md
@@ -298,6 +298,14 @@ You can use `tcpdump` to look after the packets received and send by
 
     tcpdump -s0 -vv -pni eth0 ether dst 01:80:c2:00:00:0e
 
+Intel X710 cards may handle LLDP themselves, intercepting any incoming
+packets. If you don't see anything through `tcpdump`, check if you
+have such a card (with `lspci`) and stop the embedded LLDP daemon:
+
+    for f in /sys/kernel/debug/i40e/*/command; do
+        echo lldp stop > $f
+    done
+
 License
 -------
 
-- 
2.39.5