scanning through a cisco client server vpn

I have a remote server that i would like to scan.  The remote subnet is 192.168.100.0/24. However when I connect to the remote subnet via the cisco VPN I am provided a dhcp address of 192.168.3.3/24.  These are obviously different subnets but the cisco VPN handles the two subnets seamlessly such that a tracert from 192.168.3.3 to 192.168.100.226 yields only one hop.Note that there is no gateway provided by the VPN DHCP.

Ethernet adapter Local Area Connection 2:

        Connection-specific DNS Suffix  . : xxx.com
        IP Address. . . . . . . . . . . . : 192.168.3.3
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . :

C:\Documents and Settings\a>tracert 192.168.100.226

Tracing route to 192.168.100.226 over a maximum of 30 hops

  1    63 ms    68 ms    72 ms  192.168.100.226

Trace complete.

C:\Documents and Settings\a>

The connectivity is there and I have full access to the subnet (no acls).  However it appears that nessus does not like the fact it cannot find the logical default gateway of my subnet.  see the log file below.  How can I scan this subnet through the VPN? See the first line.

[Tue Jul 29 22:28:09 2008][3064] Can not get mac address of gateway 0.0.0.0 
[Tue Jul 29 22:28:09 2008][3064] user marcus : testing 192.168.100.226 (192.168.100.226) [3064] 
[Tue Jul 29 22:28:09 2008][3064] Scan 192.168.100.226 using 22302 plugins 
[Tue Jul 29 22:28:09 2008][3064] user marcus : launching clrtxt_proto_settings.nasl against 192.168.100.226 [1] 
[Tue Jul 29 22:28:09 2008][3064] user marcus : launching dont_scan_settings.nasl against 192.168.100.226 [2] 
[Tue Jul 29 22:28:09 2008][3064] user marcus : launching ssh_settings.nasl against 192.168.100.226 [3] 
[Tue Jul 29 22:28:09 2008][3064] clrtxt_proto_settings.nasl (process 1) finished its job against 192.168.100.226 in 0.020 seconds 
[Tue Jul 29 22:28:09 2008][3064] dont_scan_settings.nasl (process 2) finished its job against 192.168.100.226 in 0.020 seconds 
[Tue Jul 29 22:28:09 2008][3064] ssh_settings.nasl (process 3) finished its job against 192.168.100.226 in 0.000 seconds 
[Tue Jul 29 22:28:09 2008][3064] user marcus : launching snmp_settings.nasl against 192.168.100.226 [4] 
[Tue Jul 29 22:28:13 2008][3064] snmp_settings.nasl (process 4) finished its job against 192.168.100.226 in 3.154 seconds 
[Tue Jul 29 22:28:13 2008][3064] user marcus : launching ping_host.nasl against 192.168.100.226 [5] 
[Tue Jul 29 22:28:16 2008][3064] ping_host.nasl (process 5) finished its job against 192.168.3.3 in 3.044 seconds 
[Tue Jul 29 22:28:16 2008][3064] user marcus : launching dont_scan_printers.nasl against 192.168.100.226 [6] 
[Tue Jul 29 22:28:16 2008][3064] The remote host (192.168.100.226) is dead 
[Tue Jul 29 22:28:16 2008][3064] Finished testing 192.168.100.226. Time : 6.629 secs, 6 plugins launched 
[Tue Jul 29 22:28:16 2008][3064] 1 hosts scanned
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