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ssh -t shmem@gateway ssh -t admin@host.example.com \
  ssh -t wrxd15@192.168.123.2 ssh -t root@192.168.254.2

              host1      host2      host3
            +-------+  +-------+  +-------+
...
ssh 2 ---------------------/   |  |       |
ssh 1 ----------/   |  |       |  |       |
            +-------+  +-------+  +-------+

              host1      host2      host3
            +-------+  +-------+  +-------+
...
            |       |  |       |  |       |  
            |       |  |       |  |       |  
            +-------+  +-------+  +-------+

              host1      host2      host3     | |
            +-------+  +-------+  +-------+   | |
...
ssh 2 --------------------/    |  |       |   |o|
ssh 1 ---------/    |  |       |  |       |   |r|
            +-------+  +-------+  +-------+   |k|