From: David Schweikert <david@schweikert.ch>
Date: Sun, 2 Aug 2020 16:16:15 +0000 (+0200)
Subject: add a not about unprivileged mode
X-Git-Url: https://git.gsnw.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9682f3e49dbb1560b6de746388d39bf4983e1439;p=fping.git

add a not about unprivileged mode
---

diff --git a/README.md b/README.md
index 938a5a1..5acd769 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,12 @@ If you want to install fping from source, proceed as follows:
 3. Make fping either setuid, or, if under Linux:
    `sudo setcap cap_net_raw+ep fping`
 
+If you can't run fping as root or can't use the cap_net_raw capability, you can
+also run fping in unprivileged mode. This works on MacOS and also on Linux,
+provided that your GID is included in the range defined in
+`/proc/sys/net/ipv4/ping_group_range`. This is particularly useful for running
+fping in rootless / unprivileged containers.
+
 ## Usage
 
 Have a look at the [fping(8)](doc/fping.pod) manual page for usage help.