[root@fre802 ~]# cat /etc/modprobe.d/lustre.conf 
options ksocklnd sock_timeout=10 credits=1024 peer_credits=16
[root@fre802 ~]# 

[root@fre802 ~]# lnetctl net show --verbose
net:
    - net type: lo
      local NI(s):
        - nid: 0@lo
          status: up
          statistics:
              send_count: 0
              recv_count: 0
              drop_count: 0
          tunables:
              peer_timeout: 0
              peer_credits: 0
              peer_buffer_credits: 0
              credits: 0
          lnd tunables:
          tcp bonding: 0
          dev cpt: 0
          CPT: "[0]"
    - net type: tcp
      local NI(s):
        - nid: 192.168.108.2@tcp
          status: up
          statistics:
              send_count: 0
              recv_count: 0
              drop_count: 0
          tunables:
              peer_timeout: 180
              peer_credits: 16
              peer_buffer_credits: 0
              credits: 1024
          lnd tunables:
          tcp bonding: 0
          dev cpt: -1
          CPT: "[0]"
[root@fre802 ~]#

[root@fre802 ~]# lnetctl net add --net tcp1 --if eth1 --peer-credits=8 --credits=512

[root@fre802 ~]# lnetctl net show --verbose
net:
    - net type: lo
      local NI(s):
        - nid: 0@lo
          status: up
          statistics:
              send_count: 0
              recv_count: 0
              drop_count: 0
          tunables:
              peer_timeout: 0
              peer_credits: 0
              peer_buffer_credits: 0
              credits: 0
          lnd tunables:
          tcp bonding: 0
          dev cpt: 0
          CPT: "[0]"
    - net type: tcp
      local NI(s):
        - nid: 192.168.108.2@tcp
          status: up
          statistics:
              send_count: 0
              recv_count: 0
              drop_count: 0
          tunables:
              peer_timeout: 180
              peer_credits: 16
              peer_buffer_credits: 0
              credits: 1024
          lnd tunables:
          tcp bonding: 0
          dev cpt: -1
          CPT: "[0]"
    - net type: tcp1
      local NI(s):
        - nid: 192.168.118.2@tcp1
          status: up
          interfaces:
              0: eth1
          statistics:
              send_count: 0
              recv_count: 0
              drop_count: 0
          tunables:
              peer_timeout: 180
              peer_credits: 16
              peer_buffer_credits: 0
              credits: 512
          lnd tunables:
          tcp bonding: 0
          dev cpt: -1
          CPT: "[0]"
[root@fre802 ~]#