There wasn't arpwatch package in the list, so I put it
to tcpdump..

RH6.0 arpwatch package's arp2ethers script seems to be
broken; it just prints the usage of awk here.  This seemed
to fix it:

--- arp2ethers  Mon Mar 22 07:15:36 1999
+++ arp2ethers_ Tue Aug  3 07:29:01 1999
@@ -14,7 +14,7 @@
 #

 sort +2rn arp.dat | \
-    awk -e 'NF == 4 { print }' | \
+    awk 'NF == 4 { print }' | \
     awk -f p.awk | \
     egrep -v '\.[0-9][0-9]*$' | \
     sed -e 's/ .*      /       /' | \