Ahh...thanks Brian, it is a different way of specifying the subnet mask.
I have now tried your suggestion and done some testing with my VPN.
With a routing entry I can get HTTP traffic to be routed through the
default gateway.   As tested by external IP address checkers correctly
reporting my (and not my office IP address).  With the VPN running I can
use remote desktop protocols to machines on the office subnet
(192.168.57.150) so that has to be working too. However, HTTP traffic is
slower (i.e. web pages take longer to load) with the VPN running despite
being routed via the default gateway.   In addition one particular
subnet address, that of the VPN server and office router (192.168.57.2),
gets routed  via my default gateway (192.168.15.5).   The attached file
shows my routing after issuing "route" in terminal with and without the
VPN running.  IP of the office X'd out for security reasons only, it
showed the correct address.   My routing table entry in the VPN is
address = 192.168.57.0 Prefix = 24.   My understanding is that any
traffic to any IP address starting 192.168.57.XXX should be routed via
the VPN.   Why is traffic to 192.168.57.2 being directed over the
default gateway, but traffic to other IP addresses in the subnet is
correctly trafficked via the ppp0.   Is this a bug in the VPN's routing
table or some more global routing issue.  Could my browser be using the
VPN connection to resolve DNS thus slowing down web access? If so why.

PS. If this is no longer the place for this discussion I will happily
continue elsewhere.



** Attachment added: "Text File of Routing Table"
   http://launchpadlibrarian.net/19251709/Routing%20Table

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intrepid network-manager-pptp does not have essential options
https://bugs.launchpad.net/bugs/278309
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