Traceroute in VPN

Linux, connected to VPN
mark@Laptop:~$ traceroute google.com
traceroute to google.com (74.125.225.37), 30 hops max, 60 byte packets
 1  * * *
 2  192.168.1.1 (192.168.1.1)  9.569 ms  9.616 ms  9.665 ms
 3  mx80-07-001-resnet-wads-5.tc.mtu.edu (141.219.232.2)  13.059 ms  13.102 ms  13.119 ms
 4  mx960-07-001-rtr-z03-eerc.tc.mtu.edu (141.219.183.122)  13.501 ms  17.128 ms  17.147 ms
 5  mx80-07-002.tc.mtu.edu (141.219.183.97)  17.540 ms  20.541 ms  20.581 ms
 6  xe-0-0-3.hgtn-cor-mtu.mich.net (207.75.40.9)  20.597 ms  14.320 ms  14.290 ms
 7  vlan47.iron-mt-gigsw1.mich.net (198.108.22.41)  21.427 ms  18.776 ms  18.793 ms
 8  xe-5-0-1x69.eq-chi2.mich.net (198.108.22.97)  36.628 ms  38.027 ms  34.386 ms
 9  207.72.112.46 (207.72.112.46)  38.075 ms  37.717 ms  34.649 ms
10  209.85.254.120 (209.85.254.120)  38.147 ms  35.094 ms  34.896 ms
11  209.85.250.28 (209.85.250.28)  34.962 ms  28.178 ms  30.715 ms
12  ord08s06-in-f5.1e100.net (74.125.225.37)  30.733 ms  29.842 ms  28.085 ms

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Windows, connected to VPN
C:\Users\Mark>tracert 173.194.46.38

Tracing route to 173.194.46.38 over a maximum of 30 hops

  1     2 ms     2 ms     2 ms  141.219.233.110
  2     2 ms     2 ms     3 ms  192.168.1.1
  3     5 ms     2 ms     2 ms  141.219.232.2
  4     3 ms     2 ms     2 ms  141.219.183.122
  5     2 ms     2 ms     2 ms  141.219.183.97
  6     3 ms     2 ms     2 ms  207.75.40.9
  7     8 ms     7 ms     7 ms  198.108.22.41
  8    25 ms    25 ms    25 ms  198.108.22.97
  9    25 ms    25 ms    25 ms  207.72.112.46
 10    25 ms    25 ms    26 ms  209.85.254.120
 11    26 ms    26 ms    26 ms  209.85.243.53
 12    26 ms    25 ms    25 ms  173.194.46.38

Trace complete.

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VPN, from public interface. I can't figure out how to have it try from the private interface.
Traceroute start...
traceroute: Warning: google.com has multiple addresses; using 173.194.46.110
traceroute to google.com (173.194.46.110), 30 hops max, 40 byte packets
source interface: Public (141.219.233.110)
 1  mx80-07-001-resnet-wads-5.tc.mtu.edu (141.219.232.2)  0.388 ms  0.359 ms  0.342 ms
 2  mx960-07-001-rtr-z03-eerc.tc.mtu.edu (141.219.183.122)  0.360 ms  0.354 ms  0.327 ms
 3  mx80-07-002.tc.mtu.edu (141.219.183.97)  0.442 ms  0.406 ms  0.450 ms
 4  xe-0-0-3.hgtn-cor-mtu.mich.net (207.75.40.9)  0.437 ms  0.440 ms  0.403 ms
 5  vlan47.iron-mt-gigsw1.mich.net (198.108.22.41)  5.54 ms  6.83 ms  6.62 ms
 6  xe-5-0-1x69.eq-chi2.mich.net (198.108.22.97)  23.2 ms  23.1 ms  23.4 ms
 7  207.72.112.46 (207.72.112.46)  23.5 ms  23.2 ms  23.4 ms
 8  209.85.254.128 (209.85.254.128)  23.5 ms  27.5 ms  23.6 ms
 9  209.85.245.225 (209.85.245.225)  23.8 ms  23.8 ms  23.9 ms
10  ord08s13-in-f14.1e100.net (173.194.46.110)  23.5 ms  23.7 ms  23.4 ms
Trace complete.