How do Nios-II handle IP address change during the TCP/IP connection?

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Dear all,

I have problem with changing IP address in the FPGA board.

Here is my case, let say I have a FPGA board which is connected to PC. The PC sends a command to the FPGA that asks the FPGA to change its IP address to a new given IP address.

Here is my idea to handle this task :

1. After receiving IP changes command from PC, both FPGA and PC terminate their TCP/IP connection by close their socket.

2. The FPGA does the IP changes mechanism

3. Both FPGA and PC initiate a new TCP/IP connection like usual

4. The FPGA sends acknowledgement to the PC to tell that it already changes its IP address successfully.

Up to here, what do you think guys? Is my idea correct? :confused:

Now I'm facing problem with step no.2 above. To change the FPGA's IP address, what I'm thinking is in the FPGA I have to do these steps :

1. Terminate the previous TCP/IP connection (close the exist socket)

2. Assign new IP address to the FPGA (I have made a new function called 'change_ip' which is basically same as get_ip_addr function provided by altera)

3. Initiate new TCP/IP connection (create, bind, listen socket)

But the result is error, I got this following error message :

: See STDERR for expanded diagnosis translation.
:  Bind failed
:  ERRNO: : 
: See STDERR (FAULT_LEVEL is SYSTEM).
: FAULT_LEVEL is SYSTEM.
: FATAL Error, Restart required.
: Locking scheduler - endless loop.

I also tried to kill the previous "inet main" and "clock tick" tasks, but in the end it also ends up with the same error message.

Anybody know how is the correct procedure to change FPGA's IP address? :confused: :confused:

Thanks for any comments or suggestions!

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Hi,

I am a new in altera. I want to create double socket servers in simple socket example. For that i have changed the SOPC builder and created one more ethernet port. I have also get the different IP addresses when the DHCP enabled. I can also access the ethernet port through telnet one by one as simple socket server.c has only one socket. Now I am trying to fix the socket address. suppose the socket address is 192.168.1.5 for et1 , i can access the et1 through telnet, but when i change the socket address from 192.168.1.6 for et1, i get the same above error. socket is failed to bind.

code:

addr.sin_family = AF_INET;

addr.sin_port = htons(SSS_PORT);

addr.sin_addr.s_addr = inet_addr("192.168.1.6");

err:

[Network]: See STDERR for expanded diagnosis translation.

[Network]: [sc_task] Bind failed

[Network]: ERRNO: :

[Network]: See STDERR (FAULT_LEVEL is SYSTEM).

[Network]: FAULT_LEVEL is SYSTEM.

[Network]: FATAL Error, Restart required.

[Network]: Locking scheduler - endless loop.

Thanks for any suggestions!