Three routers connected in linear chain.
Two systems connected with wireless lan.
This does not fail as frequently with all routers on localhost.

---------------- ---------------

----|--------- ---------------
V
rcvr1

System A:

green router
5672 - normal listener
20001 - inter-router listener

System B:

blue router
5672 - normal listener
connector to green

collectd router
15672 - normal listener
connector to green

Failing test:

Start receiver 1 on A:5672 (green)
Start receiver 2 on B:5672 (blue)
Start sender on B:15672 (collectd)

Receivers have credit of 1000
Senders send 500-byte payloads. And plenty of 'em.

Data path:
messages received on collectd forwarded to green
green receives interrouter; sends to local receiver and forwards to blue
blue receives interrouter; sends to local receiver

See upstream issue https://issues.apache.org/jira/browse/DISPATCH-1124