Kannel Deployment

Hi all,

I know everyone who have used kannel in production here will have
deployments with more or less;
1- Server running Kannel Gateway
2- Server running HTTP Services
3- A VPN Concentrator/Router/ADSL router with assigned static public IP to
interact with operator SMSCs

I am currently setting up the above setup with ADSL Router at (3)

I am stuck with misconception or what should I call it - My public IP is
assigned to router's external interface; and
Kannel machine is now in the private network (connected to the ADSL router's
through a switch to which Services comp is also connected).

Now,
1-how can kannel machine be visible to operator smsc? (through SMPP
connection) so that operator connect with kannel at port=13000 -Suggested
network setup?
2-How much dedicated speed is required if I connect to two operators' SMSC
where expected traffic is max 200sms/sec?

Thanking in acticipation for resolution/suggestions.

Regards,
Hammad