04-06-2009
Well, I guess I jumped the gun in asking for help. I spent more time searching and came upon the solution. In case anyone wants it, here it is:
I added the virtual network eth0:0 as stated above. I put the clients I want to be masqueraded over the vpn onto that subnet. then I bring up the ppp0 interface for the VPN. I don't have it set up a default route at all. then I set up a separate table for the LAN to be sent to the subnet:
ip route flush table 18
ip route add table 18 to 192.168.1.0/24 dev eth0:0
ip route add table 18 to default via $PPP_REMOTE dev ppp0
ip rule add from 192.168.1.0/24 table 18 priority 18
18 is just an arbitrary number.
I discovered the solution here:
Linux Route Hacks
I just adapted the data presented there to my situation. wow. a few hours well spent.
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LEARN ABOUT DEBIAN
arpspoof
ARPSPOOF(8) System Manager's Manual ARPSPOOF(8)
NAME
arpspoof - intercept packets on a switched LAN
SYNOPSIS
arpspoof [-i interface] [-c own|host|both] [-t target] [-r] host
DESCRIPTION
arpspoof redirects packets from a target host (or all hosts) on the LAN intended for another host on the LAN by forging ARP replies. This
is an extremely effective way of sniffing traffic on a switch.
Kernel IP forwarding (or a userland program which accomplishes the same, e.g. fragrouter(8)) must be turned on ahead of time.
OPTIONS
-i interface
Specify the interface to use.
-c own|host|both
Specify which hardware address t use when restoring the arp configuration; while cleaning up, packets can be send with the own
address as well as with the address of the host. Sending packets with a fake hw address can disrupt connectivity with certain
switch/ap/bridge configurations, however it works more reliably than using the own address, which is the default way arpspoof cleans
up afterwards.
-t target
Specify a particular host to ARP poison (if not specified, all hosts on the LAN). Repeat to specify multiple hosts.
-r Poison both hosts (host and target) to capture traffic in both directions. (only valid in conjuntion with -t)
host Specify the host you wish to intercept packets for (usually the local gateway).
SEE ALSO
dsniff(8), fragrouter(8)
AUTHOR
Dug Song <dugsong@monkey.org>
ARPSPOOF(8)