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-   ## Examining the Network Configuration Files Each interface of each peer node must have the following configuration information: An entry in the `/etc/hosts` file for the node An `/etc/hostname.`interface-name`` file or an `/etc/nodename` file Examine these files to understand the network configuration of a peer node. To find the name of the current node, see Mapping the Network Configuration of a Peer Node. The network configuration files contain the following example information. In the following examples, the node name is `MEN-C250-N20`. `/etc/hostname.hme0` and `/etc/hostname.hme1` These files defines the host name for the `hme0` and `hme1` interface on a node. The `/etc/hostname.hme0:100` file defines the host name for an additional external interface configured on a node. `/etc/nodename` This file defines the host name of the `cgtp0` interface on a node. `/etc/hosts` This file contains a list of host names. For a cluster of three nodes, using the default class C addressing scheme, the `/etc/hosts` file is like this: Local host
        127.0.0.1 localhost
    Peer node 1 address triplet (Current node)
        10.250.1.20 MEN-C250-N20 MEN-C250-N20.localdomain loghost
        10.250.2.20 MEN-C250-N20-nic1 MEN-C250-N20-nic1.localdomain
        10.250.3.20 MEN-C250-N20-cgtp MEN-C250-N20-cgtp.localdomain
    Peer node 2 address triplet
        10.250.1.10 MEN-C250-N10
        10.250.2.10 MEN-C250-N10-nic1
        10.250.3.10 MEN-C250-N10-cgtp
    Peer node 3 address triplet
        10.250.1.30 NMEN-C250-N30
        10.250.2.30 NMEN-C250-N30-nic1
        10.250.3.30 NMEN-C250-N30-cgtp
    External address
        172.36.128.51 sol52
    Floating address triplet
        10.250.1.1 master-nic0
        10.250.2.1 master-nic1
        10.250.3.1 master-cgtp
2. ## Examining the Routes on a Node At startup, the Cluster Membership Manager (CMM) creates a routing table for the interfaces on each peer node. The routing table is used by Carrier Grade Transport Protocol (CGTP) for data replication. To examine the routing table for a peer node, perform the following procedure. For simplicity, this procedure does not show external network access. ### To Examine the Routing Table for a Node Log in to the peer node whose routes you want to examine. Display the routing table for the node:
       # netstat -r
   For a node using the class C addressing scheme, output similar to this is displayed:
       Routing Table: IPv4
         Destination           Gateway           Flags    Ref   Use  Interface
       -------------------- -------------------- -----  ----- ------ ---------
       10.250.3.255         10.250.1.255          UGHMS     1      0
       10.250.3.255         10.250.2.255          UGHMS     1      0
       NMEN-C250-N30-cgtp   NMEN-C250-N30         UGHMS     1   2557
       NMEN-C250-N30-cgtp   NMEN-C250-N30-nic1    UGHMS     1   2554
       master-cgtp0         master-nic0           UGHMS     1      1
       master-cgtp0         master-nic1           UGHMS     1      1
       MEN-C250-N10-cgtp    MEN-C250-N10          UGHMS     1   2644
       MEN-C250-N10-cgtp    MEN-C250-N10-nic1     UGHMS     1   2640
       10.250.1.0           MEN-C250-N20          U         1   3886  hme0
       10.250.1.0           MEN-C250-N20          U         1      0  hme0:1
       10.250.2.0           MEN-C250-N20-nic1     U         1   3866  hme1
       10.250.2.0           MEN-C250-N20-nic1     U         1      0  hme1:1
       10.250.3.0           MEN-C250-N20-cgtp     U         1      0  cgtp0
       10.250.3.0           MEN-C250-N20-cgtp     U         1      0  cgtp0:1
       default              10.250.1.253          UG        1      0
       localhost            localhost             UH       17    747  lo0
- For a description of the column headings, see Output of the `netstat` `-r` Command. From the sample output, you can conclude the following facts: This is a three node cluster. The cluster contains the nodes `NMEN-C250-N30`, `MEN-C250-N10`, and the current node. The CGTP routes to broadcast `10.250.1.255` are as follows:
        Destination           Gateway           Flags    Ref   Use  Interface
      -------------------- -------------------- -----  ----- ------ ---------
      10.250.3.255         10.250.1.255          UGHMS     1      0
      10.250.3.255         10.250.2.255          UGHMS     1      0
- The CGTP routes to node 30 are as follows:
        Destination           Gateway           Flags    Ref   Use  Interface
      -------------------- -------------------- -----  ----- ------ ---------
      NMEN-C250-N30-cgtp   NMEN-C250-N30         UGHMS     1   2557
      NMEN-C250-N30-cgtp   NMEN-C250-N30-nic1    UGHMS     1   2554
- The CGTP routes to the CGTP floating address, `cgtp0:1`, are as follows:
        Destination           Gateway           Flags    Ref   Use  Interface
      -------------------- -------------------- -----  ----- ------ ---------
      master-cgtp          master-nic0           UGHMS     1      1
      master-cgtp          master-nic1           UGHMS     1      1
- The CGTP routes to `MEN-C250-N10` are as follows:
        Destination           Gateway           Flags    Ref   Use  Interface
      -------------------- -------------------- -----  ----- ------ ---------
      MEN-C250-N10-cgtp    MEN-C250-N10          UGHMS     1   2644
      MEN-C250-N10-cgtp    MEN-C250-N10-nic1     UGHMS     1   2640
The other entries in the table are standard Solaris routes. To change the entries in the routing table, use the `route` command as described in the `route`(1M) man page.
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