From 957ceb727d006981143448e600923f1cdf892f1ebf33c81cd0b7e57deab9da73 Mon Sep 17 00:00:00 2001
From: ADAM David Alan Martin <adam@recursive.engineer>
Date: Thu, 3 Sep 2026 00:18:15 -0400
Subject: [PATCH] Fix v4 net selection bug.

---
 rc.subr | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/rc.subr b/rc.subr
index 5e71582..7798315 100755
--- a/rc.subr
+++ b/rc.subr
@@ -107,14 +107,19 @@ compute_net()
 
 compute_v4_net()
 {
-	_card=$(echo ${_iface} | sed -e's/\.[0-9]*//')
-	eval _net=\${v4_net_${_card}}
+	_card=${1}
+	_vlan=${2}
+	_echo "_net=\${v4_net_${_card}}"
+	eval "_net=\${v4_net_${_card}}"
+	_echo "In v4 net computation for ${_card} with found net <${_net}> to add with <${_vlan}>"
 	if [ -z "${_net}" ]
 	then
 		_net=${v4_net}
 	fi
     _prefix=${_net}
-    _subnet=$2
+    _base=$((${_vlan}%10))
+    _high=$(( ( ( ${_vlan} / 100 ) % 10 ) * 10 ))
+    _subnet=$(( ${_high} + ${_base} ))
     echo "${_prefix}.${_subnet}.1/24"
 }
 
@@ -467,6 +472,7 @@ add_v4_net()
     _compute_nets $*
 	_card_and_vlan="${_card}_${_vlan}"
 	_card_dot_vlan="${_card}.${_vlan}"
+	_echo "In v4 net for ${_card_and_vlan} with ${_card_dot_vlan}"
     if [ ${_vlan} -ne 0 ]
 	then
 		add_vlan $_card $_vlan
@@ -480,7 +486,7 @@ add_v4_net()
     then
         _class_group="group ${_class}"
     fi
-    eval ifconfig_${_card_and_vlan}=\"$(compute_v4_net $_card $_subnet) group internal ${_class_group}\"
+    eval ifconfig_${_card_and_vlan}=\"$(compute_v4_net ${_card} ${_vlan}) group internal ${_class_group}\"
     eval dhcpd_ifaces=\"${dhcpd_ifaces} ${_card_dot_vlan}\"
 }