If you are using normal IPSec without AH, you'll need to open up UDP port 500 for IKE, and protocol 50 (_protocol_, not port) for IPSec ESP. If you are using AH, you will also need protocol 51.
If you are using UDP wrapped IPSec, you'll just need UDP/500 and whatever UDP port you encapsulate in.
Definitely try new IOS. Older versions also have a very serious problem where anybody with web access to the device can execute any privileged command without logging in.
Not sure what all cisco is including now as their "tcp and udp small servers", but make sure you have
no service tcp-small-servers
no service udp-small-servers
See what ports are open from the router itself with the commands:
show tcp brief all | include LISTEN
and for IP sockets...
Easiest way would be to use the snprintf function. It basically prints to a buffer in memory instead of the screen.
int snprintf ( char *str, size_t n,
const char *format, ... );
(The string would have to be of type char*, not const char*, and I'm assuming var1 and var2 are...
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