Hi Roman,
1) What version of Mellanox OFED driver are you running?
2) Could you please confirm that no firewall is configured on both servers.
3) I am assuming you are opening a server/client relation with the ib_write_bw utility correct?
4) Please confirm as well the the rdma modules are loaded on both servers (#lsmod | egrep -i 'mlx|ib)
5) Are you able to run the following commands:
#ibtracert <src lid> <dest lid>
#ibping -S (server)
#ibping <server lid>
6) Can you run it again as follow:
#ib_send_bw -d mlx4_0 -i 1 10.0.0.5 -F --report_gbits
7) I just tested in the order you were running the CLI and got the same error:
[root@i-zak-9 bin]# ib_send_bw -d mlx4_0 -i 1 -F --report_gbits 1.1.1.108
Couldn't connect to 1.1.1.108:18515
Unable to open file descriptor for socket connection Unable to init the socket connection
Please place the IP address after the port number.
Thank you,
Sophie.