diff --git a/if-traffic b/if-traffic
new file mode 100755
index 00000000..cf4e1db1
--- /dev/null
+++ b/if-traffic
@@ -0,0 +1,108 @@
+#!/usr/bin/env python
+# -*- coding: iso-8859-15 -*-
+# Hey, c'est du -*- python-*-, ça !
+#
+# Ecrit mi-février par Chep pour les besoins locaux...
+#
+
+import string,shelve,pickle,sys
+
+def tuple_to_dico(tup) :
+    "construit un dictionnaire à partir du tuple d'une interface"
+    fields={ 0:'in', 1:'inp', 2:'ierr', 3:'idrop', 4:'ififo', 5:'iframe', 6:'icompressed',
+             7:'imulticast', 8:'out', 9:'outp', 10:'oerr', 11:'odrop', 12:'ofifo', 13:'cols',
+             14:'carrier', 15:'ocompressed' }
+    dic = {}
+    for n in fields.keys() :
+        dic[ fields[n] ] = data[ n ]
+    if dic['outp']: dic['colr'] = long((100 * dic['cols']) / dic['outp'])
+    else: dic['colr'] = 0L
+    
+    dic['npi'] = dic['ierr']+dic['idrop'] + dic['ififo'] + dic['iframe'] +dic['icompressed']
+    dic['npo'] = dic['oerr']+dic['odrop']+dic['ofifo']+dic['carrier']+dic['ocompressed']
+    
+    dic['mnpi'] = 1000 * dic['npi']
+    dic['mnpo'] = 1000 * dic['npo']
+    dic['unpi'] = 1000 * dic['mnpi']
+    dic['unpo'] = 1000 * dic['mnpo']
+    
+    if dic['inp']: dic['npir'] = long((100 * dic['npi']) / dic['inp'])
+    else:
+        if dic['ierr']: dic['npir'] = 99L # erreurs et pas de paquets entrants !
+        else: dic['npir'] = 0L
+    if dic['outp']: dic['npor'] = long((100 * dic['npo']) / dic['outp'])
+    else:
+        if dic['oerr']: dic['npor'] = 99L
+        else: dic['npor'] = 0L
+        
+    # totaux dans les deux sens (tnp = total nasty pkts,tgp = total good pkts) 
+    dic['tnp'] = dic['npi'] + dic['npo']
+    dic['tgp'] = dic['inp'] + dic['outp']
+    return dic
+
+
+if len(sys.argv) < 2:
+    sys.stderr.write("""usage: %s ethN [var1] [var2] [long ifname]\n
+var1 and var2 can be :
+   in:  incoming bytes
+  out:  outgoing bytes
+ cols:  collisions
+  inp:  incoming packets
+ outp:  outgoing packets
+ colr:  collision ratio, in percent  (cols / outp)
+ npi :  incoming 'nasty' packets
+ npo :  outgoing 'nasty' packets
+ mnpi : 1000 * npi
+ mnpo : 1000 * npo
+ npir:  incoming 'nasty' packet ratio
+ npor:  outgoing 'nasty' packet ratio
+
+default var1 and var2 are in,out.
+Result is to be fed to MRTG.
+""" % (sys.argv[0]))
+    sys.exit(0)
+
+iface = sys.argv[1]
+ifname = iface
+
+if len(sys.argv) > 2:
+    var1 = sys.argv[2]
+    if len(sys.argv) > 3:
+        var2 = sys.argv[3]
+        if len(sys.argv) > 4:
+            ifname = sys.argv[4]
+    else: var2 = 'out'
+else:
+    var1 = 'in'
+    var2 = 'out'
+
+fd = open('/proc/net/dev','r')
+sl = fd.readlines()
+fd.close()
+
+Ifaces = {}
+for s in sl:
+    ln = string.split(s,':')
+    if len(ln) < 2: continue
+    data = string.split(ln[1])
+    try :
+	n = long(data[1])
+    except : continue
+    for k in range(len(data)):
+        data[k] = long(data[k])
+    Ifaces[string.strip(ln[0])] = tuple_to_dico(data)
+    
+i = Ifaces[iface]
+
+# python1.5 fait str(1234L) =="1234L", il faut enlever le L..
+ver=sys.version[0]
+if ver[0]=='1' :
+    s1 = str( i[var1])[:-1]
+    s2 = str( i[var2])[:-1]
+else :
+    s1 = str( i[var1])
+    s2 = str( i[var2])
+    
+print "%s\n%s\n\n%s" % (s1, s2 ,ifname)
+
+