Infiniband Verifying that RDMA is working

I have two identical computers with Mellanox cards connected to each other through a cable. No switch. Using opensm.

I have run several tests, including ping_pong tests, ibping, etc. They all seem to work. However, when I run this test, it comes back with what appears to be an error, which I don't understand.

I did tell the firewall

sudo iptables -I INPUT -p tcp -s 192.168.0.0/24  -j ACCEPT -m comment --comment "Allow Infiniband"

sudo iptables -I INPUT -p udp -s 192.168.0.0/24  -j ACCEPT -m comment --comment "Allow Infiniband"

Any help deciphering and a possible solution would be great.

[idf@node2 Downloads]$ sudo ib_write_bw

************************************
* Waiting for client to connect... *
************************************
---------------------------------------------------------------------------------------
                    RDMA_Write BW Test
 Dual-port       : OFF      Device         : mlx4_0
 Number of qps   : 1        Transport type : IB
 Connection type : RC       Using SRQ      : OFF
 CQ Moderation   : 100
 Mtu             : 4096[B]
 Link type       : IB
 Max inline data : 0[B]
 rdma_cm QPs     : OFF
 Data ex. method : Ethernet
---------------------------------------------------------------------------------------
 local address: LID 0x01 QPN 0x004a PSN 0xa79f2e RKey 0x50042a04 VAddr 0x007f1682804000
 remote address: LID 0x02 QPN 0x004a PSN 0x5ef914 RKey 0x40042502 VAddr 0x007f94f9ce9000
---------------------------------------------------------------------------------------
 #bytes     #iterations    BW peak[MB/sec]    BW average[MB/sec]   MsgRate[Mpps]
ethernet_read_keys: Couldn't read remote address
 Unable to read to socket/rdam_cm
 Failed to exchange data between server and clients
[idf@node2 Downloads]$


[idf@node1 python]$ sudo ib_write_bw 192.168.0.1
---------------------------------------------------------------------------------------
                    RDMA_Write BW Test
 Dual-port       : OFF      Device         : mlx4_0
 Number of qps   : 1        Transport type : IB
 Connection type : RC       Using SRQ      : OFF
 TX depth        : 128
 CQ Moderation   : 100
 Mtu             : 4096[B]
 Link type       : IB
 Max inline data : 0[B]
 rdma_cm QPs     : OFF
 Data ex. method : Ethernet
---------------------------------------------------------------------------------------
 local address: LID 0x02 QPN 0x004a PSN 0x5ef914 RKey 0x40042502 VAddr 0x007f94f9ce9000
 remote address: LID 0x01 QPN 0x004a PSN 0xa79f2e RKey 0x50042a04 VAddr 0x007f1682804000
---------------------------------------------------------------------------------------
 #bytes     #iterations    BW peak[MB/sec]    BW average[MB/sec]   MsgRate[Mpps]
Conflicting CPU frequency values detected: 1600.000000 != 1733.000000
Can't produce a report
[idf@node1 python]$