There is a typo here: “Otherwise, the packet has no corresponding TCP socket on the first-hop server. So it is forwarded on to the second-hop server to be proc

There is a typo here: “Otherwise, the packet has no corresponding TCP socket on the first-hop server. So it is forwarded on to the second-hop server to be processed there (in the expectation that it belongs to some flow established on the second-hop server that we wish to maintain).” That should be udb.