use ip -br

bin/fai

@@ -5,7 +5,7 @@
 # fai -- main installation script executed after booting
 #
 # This script is part of FAI (Fully Automatic Installation)
-# (c) 1999-2020 by Thomas Lange, lange@informatik.uni-koeln.de
+# (c) 1999-2021 by Thomas Lange, lange@informatik.uni-koeln.de
 # Universitaet zu Koeln
 # (c) 2001-2005 by Henning Glawe, glaweh@physik.fu-berlin.de
 # Freie Universitaet Berlin
@@ -118,9 +118,7 @@ fai_init() {
         cat /proc/kmsg >/dev/tty4 &
 
         # fix IP address lifetime
-        ip -4 addr show | \
-            awk '/^[0-9]+: [^:]+:/ { iface = substr($2, 1, length($2) - 1); }
-                 /^  *inet [0-9.]*\/[0-9]* / && iface != "lo" { print $2, iface; }' | \
+	ip -4 -br a | awk '/UP / {if ($3) print $3 " " $1}' | \
         while read addr iface; do
             ip -4 addr change "$addr" dev "$iface" valid_lft forever preferred_lft forever
         done