NetCat & Port Redirection & -b option

[imported_l1nuxant_ee]

Dears,

I am trying to implement Port redirection using netcat. I have 3 PCs:

"A" from which I run

nc -vv 192.168.1.2 -p 80

"B" from which I run

nc -lvvp 80 | nc -vv 192.168.1.3 -p 5555

"C" from which I run

nc -lvvp 5555

The idea is to connect from A to C on the port 5555 (assuming A is behind firewall and only port 80 is opened)

the flow works correctly, Text from A goes to C, however, text from C doesn't came back to A, but stuck in B.

I have searched and found that this can be solved by adding a second pipe to B as follows:
nc -lvvp 80 | nc -vv 192.168.1.3 -p 5555 | nc -lvv -b -p 80

however, my netcat doesnt contain -b option (on both BT2 & windows binary).

I have searched the forum and found a solutions using backpipe, but really I didn't understood it.

mknod backpipe p
nc -l -p 80 0<backpipe | tee -a inflow | nc localhost 81 | tee -a outflow 1>backpipe

thanks in advance,

[level]

The mknod creates a FIFO that can use to pass data between the tees and NetCats.

[imported_l1nuxant_ee]

The mknod creates a FIFO that can use to pass data between the tees and NetCats.

Thanks level for the clarification.

However, I think mknod is a *nix command, which means that it cannot be run on a windows box (I know some will say, this is not a windows forum).

May problem is why the netcat version on BT2.0 doesn't contain the -b option (for broadcasting).

Thanks alot in advance,

[thorin]

Thanks level for the clarification.

However, I think mknod is a *nix command, which means that it cannot be run on a windows box (I know some will say, this is not a windows forum).

mknod is available under the GNUWin32 CoreUtils package:
http://gnuwin32.sourceforge.net/packages/coreutils.htm

[imported_l1nuxant_ee]

mknod is available under the GNUWin32 CoreUtils package:
http://gnuwin32.sourceforge.net/packages/coreutils.htm

Thanks alot thorin, I will be checking it.