Hello to all and thanks in advance for your help. 
Relative newbie to shrew and vpn's in general.
 
Here's The issue I'm facing. 
 
I have a pfsense firewall running ipsec - preshare key setup
 
I have 4 remote users using shrew client release 2.1.6 on windows xp 
workstations.
 
2 of the users are at individual remote sites. Client is configured with ufqdn 
and ip address is set using virtual adapter and specify the settings (i.e. 
192.168.200.1 nm 255.255.255.0)  The use a soft phone device and use a phone at 
home. Works GREAT. Figured out how to autostart the client on startup and they 
are thrilled. (donation coming for the shrew client BTW :))
 
Here's the issue. The other 2 users are at a remote location that they share. 
They are both behind a junker linksys natting router sharing a single public ip 
address. I configured both users shrew client as I did the others with unique 
identifiers, key, etc.
When I connect the first user, works great, pings successful.
When I connect the second user, works great, pings successful, but it causes 
some type of packet loss on the first user, until I disconnect/reconnect. Then 
the first user works again, but the second is disconnected. Rinse/Repeat.
 
After looking at the logs, it appears that racoon on the pfsense side is 
getting confused because it sees the remote public ip address of that linksys 
router and doesn't see that there are multiple tunnels trying to be established.
 
Any ideas on resolution?
 
thanks, 
Scott 
612.598.1505 if you can talk, or email. thanks again.                           
          
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