I've solved it, it was a stupid mistake…. on the machine I was trying to reach!!!! >:(
192.168.129.253 it's the linux machine that I was trying to reach, it has a second eth interface with address 10.0.0.1 and (wrong!!!!) netmask of 255.0.0.0
So I was reaching the machine, but packets got forwarded to the wrong interface instead of going back, hence the timeout!!
Putting the right netmask solved the problem, now everything works fine.
Lesson learned!