From: Vincent Bernat <vincent@bernat.ch>
Date: Fri, 18 Mar 2022 22:11:51 +0000 (+0100)
Subject: doc: restore note about Intel cards
X-Git-Tag: 1.0.14~10
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=45f3c77332be56ce2df3bcf8c402bd1f14d29f39;p=thirdparty%2Flldpd.git

doc: restore note about Intel cards

People using older versions of lldpd may not find this information
easily. So put it back in the README.
---

diff --git a/README.md b/README.md
index 6f350b16..f02838ab 100644
--- a/README.md
+++ b/README.md
@@ -405,6 +405,17 @@ 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
+
+This may also apply to the `ice` (Intel E8xx cards) driver. These
+steps are not necessary with a recent version of `lldpd` (1.0.11+).
+
 ## License
 
 lldpd is distributed under the ISC license: