From 969e31d6d0089fa2f67f1fb3ef8ad0dc5bffc152 Mon Sep 17 00:00:00 2001
From: Chris Hofstaedtler <ch@grml.org>
Date: Mon, 12 Jan 2026 21:18:02 +0100
Subject: [PATCH] Discard IPv6 nameservers

Cannot put them into an IPv4 DHCP config.

Closes: grml/grml-terminalserver#19
---
 grml-terminalserver-config | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/grml-terminalserver-config b/grml-terminalserver-config
index 39f7fb2..0bcea5c 100755
--- a/grml-terminalserver-config
+++ b/grml-terminalserver-config
@@ -190,7 +190,14 @@ for addresses from 192.168.0.101 to (and including) 192.168.0.200.
     done
   done
 
-  NAMESERVERS_=`netGetNameservers warn`
+  NAMESERVERS_=''
+  local nameserver
+  for nameserver in $(netGetNameservers warn); do
+    # Drop IPv6 nameservers
+    if [[ $nameserver != *:* ]]; then
+      NAMESERVERS_+="$nameserver "
+    fi
+  done
   GW_=`netGetDefaultGateway warn`
   GW_DEV_=`ip route get "$GW_" | sed 's/^local //' | awk '{ print $3; exit; }'`
   if [ "$GW_DEV_" != "$INTERFACE_" ] && [ "$GW_DEV_" != "" ] && [ "$GW_DEV_" != "lo" ]; then