Hello,
there is a very strange type of problem im facing.I use p2p softwares like utorrent,ares,azureus etc. for downloading.But all the p2p softwares are giving a NAT error that the port is blocked.I had configured my router and forwarded the ports and checked the them from softwares like utorrent and the result was the port is forwarded and recivieng incoming connections,all the errors were fixed and everything was going fine.But after a few days the error was again there that there is a NAT error and the port is blocked i have checked my router the ports were forwarded there but the p2p softwares are still giving erors that port is blocked and in my router settings the ports are forwarded.I have checked all the computers on my network all are giving the same error.now what is the problem i cant undestand because in my router settings everything is ok.i have formatted my pc and againg installed windows but the errors are still there and every p2p software is giving error[Error! Port 11900 does not appear to be open.]now what to do i dont know plz help me.

my router is beetel 220bx.
im from india and i have an airtel broadband connection.

Hi there,

Do your PC's on your home LAN get their IP addresses automatically via DHCP from your router.

If so, this could be the reason why your port forwarding rule is breaking.

Port forwarding requires a port type ( either UDP, TCP or both ), number and destination IP address on your home LAN to forward it to.

If you are using DHCP, then it is possible that your PC's IP address is changing - this is a result of the DHCP lease expiring and a new IP address being assigned to it by your router's DHCP server.

So, if this is happening, your port forwarding rule will no longer be valid because the destination IP address is now different.

If this is what is happening - you have a couple of options here :-

1. Some routers can allow you to reserve IP addresses from the DHCP pool. This means you can ensure that the same IP address is given to a certain MAC address. If your router has this feature, you can ensure your PC will always be given the same IP address even though you are using DHCP.

2. Another solution is to set up a static IP addressing scheme for your home LAN, therefore, the IP address of your PC will not change.

Hope this helps, let us know how you get on.
Cheers, Lofty.