Unable to query IPv4 router of manually configured interface

I need to determine the IPv4 router for a given Ethernet/WiFi interface.
The route table can not always be used to determine the router in the case of a multi-homed system.
So, the SystemConfiguration framework seems to be the right choice to use by querying the kSCPropNetIPv4Router property from the network service associated with the interface.
This works fine assuming the Ethernet or WiFi interface is configured using DHCP. However, if the interface is manually configured then the kSCPropNetIPv4Router property doesn't seem to exist!
I have a sample program which illustrates this and scutil seems to show the same thing.
Any help?

PWD=/
SHLVL=1
SECURITYSESSIONID=ceb19270
_=/usr/bin/printenv
uid=0(root) gid=0(wheel) groups=0(wheel)
The script works much better when it can find the required programs. :0)
which netstat awk ping arp sed
/usr/sbin/netstat
/usr/local/bin/awk
/sbin/ping
/usr/sbin/arp
/usr/bin/sed
<pre style="border: 1px solid #ddd; padding-left: .75ex; padding-top: .25em; padding-bottom: .25em; margin-top: .5em; margin-bottom: .5em; margin-left: 1ex; max-width: 80ex; overflow: auto; font-size: 10px; font-family: Monaco, 'Courier New', Courier, monospace; color: #444; background: #eee; line-height: normal">get_route_mac() {
ip=$(/usr/sbin/netstat -nrfinet | /usr/local/bin/awk '/^default/{print $2; exit}')
[[ "$ip" = *.*.*.* ]] || return 1
[ ${1:-0} -gt 0 ] && /sbin/ping -nc$1 $ip 2>&1 >/dev/null
/usr/sbin/arp -n $ip | /usr/bin/sed -n 's/.* at (.*:.*:.*:.*:.*:.*) on .*/ /p'
}</pre>
Thanks for your help, Bob!

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