user
      |
  r2--r1--r3
  |        |
  |        |
  s1      s2

host $ vagrant up
host $ vagrant ssh user
user $ traceroute 10.30.1.3

traceroute to 10.30.1.3 (10.30.1.3), 64 hops max, 40 byte packets
 1  10.20.1.11 (10.20.1.11)  0.701 ms  0.562 ms  0.416 ms
 2  10.10.12.12 (10.10.12.12)  0.705 ms  1.064 ms  0.645 ms
 3  10.30.1.3 (10.30.1.3)  0.812 ms  0.969 ms  0.673 ms

user $ ping 10.30.1.3

host $ vagrant suspend r2

host $ vagrant suspend r3

host $ vagrant resume r2