Mark, You are correct! I was encoding the source and local IP in the opposite order. I appreciate the help! Rob On Wed, Jun 10, 2009 at 12:41 AM, Mark Fine<> wrote: > The raw option > > {raw,0,39,<<16#e2000000:32,16#0:32,16#01010101:32>>} > > successfully generated IGMPv3 reports on my configuration -- traceroute showed