1 files changed, 9 insertions, 4 deletions

diff --git a/plugins-root/check_dhcp.c b/plugins-root/check_dhcp.c
index b02ee49..42eedec 100644
--- a/plugins-root/check_dhcp.c
+++ b/plugins-root/check_dhcp.c
@@ -372,11 +372,16 @@ int get_hardware_address(int sock,char *interface_name){
         char *p;
         int unit;
 
-        for(p = interface_name; *p && isalpha(*p); p++)
-                /* no-op */ ;
-        if( p != '\0' ){
+    /* get last number from interfacename, eg lnc0, e1000g0*/
+    int i;
+    p = interface_name + strlen(interface_name) -1;
+        for(i = strlen(interface_name) -1; i > 0; p--) {
+                if(isalpha(*p))
+            break;
+    }
+    p++;
+        if( p != interface_name ){
                 unit = atoi(p) ;
-                *p = '\0' ;
                 strncat(dev, interface_name, 6) ;
                 }
         else{