Consider the 4-router network shown below, where packet forw…
Consider the 4-router network shown below, where packet forwarding is controlled by flow tables (e.g., configured via OpenFlow in an SDN controller), rather than by a forwarding table computed by a routing algorithm. The addresses of networks attached to each of the router is also shown. The interfaces at each of the routers are also as indicated. Suppose we want the following forwarding behavior of packets to be implemented: TCP packets coming from the source network attached to s2 and destined to the network attached to s3 should be forwarded along the path: s2 -> s1 -> s4 -> s3. What rule should be inserted at router s1