fix multi-ip attach
fix multi-ip attach

This got broken in f7dfe9d

dpw/weave,awh/weave,tomwilkie/weave,weaveworks/weave,n054/weave,dpw/weave,rade/weave,awh/weave,n054/weave,rade/weave,paulbellamy/weave,rade/weave,paulbellamy/weave,squaremo/weave,dpw/weave,squaremo/weave,n054/weave,awh/weave,squaremo/weave,tomwilkie/weave,aaam/weave,tomwilkie/weave,squaremo/weave,tomwilkie/weave,weaveworks/weave,paulbellamy/weave,aaam/weave,rade/weave,dpw/weave,weaveworks/weave,aaam/weave,paulbellamy/weave,aaam/weave,tomwilkie/weave,awh/weave,dpw/weave,rade/weave,bboreham/weave,aaam/weave,squaremo/weave,bboreham/weave,bboreham/weave,awh/weave,weaveworks/weave,bboreham/weave,n054/weave,n054/weave,bboreham/weave