NAT

[vinithpj]

Hi Friends…

I had to Nat my internal Ftp server to internet and its working also.. but what happened is after some days people cannot access the Public ip which i nated to the FTP(Internal). it wont work at that time..
If i change the public ip and given it to some other which is not used... it will start working again...
after some days again same..
can anyone help me out regarding same...

Any idea why is it so...? :-[

Thanks in Advance..

Vinith