Yes, I have done this.  It's fairly straight forward.  You have to make sure 
the firewall guys allow the TSM server to go to the address assigned to the 
client node on its side of the NAT via port 1502 and other admin type ports, 
and the client has to be able to reach the TSM server via the ip address 
assigned to TSM on its side of the NAT (port 1500, etc.)  The DSM.opt files 
don't have anything special in them other than the IP address for server is the 
NAT'ed IP address and not the real one.  It's been a long time, so I can't 
speak with certainty about which other ports need to be opened each way.  Your 
Firewall/NAT admin(s) should be able to tell you which ports they see 
communications attempted.

See Ya'
Howard

> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
> Of Pavel Sitnikov
> Sent: Monday, August 18, 2008 1:41 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: [ADSM-L] backup via NAT with TSM
> 
> Has anyone on the list ever tried backup via NAT with TSM?
> If so, could you give dsm.opt for client node behind the NAT. Client
> node
> win2003 R2 SP2 with Storage agent. Ver. 5.5.
> Thx in advance.
> 
> ..............................................................
> С уважением, Ситников Павел
> Дирекция сопровождения серверных систем
> ОАО "УРАЛСИБ", Уфа
> (347) 251-96-62, (010) 4385