diff --git a/fw.globals b/fw.globals
index 4c273cc..fea67f8 100644
--- a/fw.globals
+++ b/fw.globals
@@ -18,7 +18,7 @@ HOST_AMANOJAKU="10.24.20.250"
 #ROUTER
 HOST_KASHA="10.24.0.1"
 HOST_KASHA_WAN="192.168.0.11"
-HOST_KASHA_WAN2="$(ip -4 a s dev eth0 | awk '$1 == "inet" && $2 != "192.168.0.11/24" { print $2; exit }')"
+HOST_KASHA_WAN2="$(ip -4 a s dev ${IF_WAN} | awk '$1 == "inet" && $2 != "192.168.0.11/24" { print $2; exit }')"
 # will allow us to do things like: if ${HAVE_WAN2}; then ...
 if [[ ! -z "${HOST_KASHA_WAN2}" ]]; then
     HAVE_WAN2="/bin/true"