MCSE Boot Camp Notes : |
Chapter 9, Configuring the Point-to-Point Protocol (PPP)
Testing dedicated link connectivity
Verify host-to-host connectivity on the link as follows:
- Turn on the PPP driver and PPP daemon logging. See ``Logging PPP information''.
-
Execute the following command:
ping remote_host_IP_address
ping send: Network is unreachableThis error message indicates that the network address of the remote host is different from that of the local host. Make sure that the network portion of the remote host's IP address is correct. (See ``IP address'' in Configuring Network Connections for a discussion of the network portion of the IP address.) For machines on the same network, the network part of the IP addresses for the local host and the remote host should match. If the machines are not on the same network, you need to configure a gateway to route packets between the two networks.
If ping hangs with no response, make sure that the IP address used on the command line is correct. It should be the value assigned to the machine connected to the other end of the dedicated serial line. If the IP address appears to be correct, look in the logfile where the PPP driver and PPP daemon log information has been collected. By default, this file is /usr/adm/syslog. The following example logfile and the description below the example show the steps PPP uses to achieve host-to-host connectivity. You can view the logfile to see if these steps have been successful.
1 Mar 14 09:31:54 127.0.0.1 pppd[318]: ppp_add_inf: 132.147.118.6 --> 132.147.118.9 2 Mar 14 09:31:58 127.0.0.1 pppd[318]: Set static PPP on tty4d 3 Mar 14 09:31:58 127.0.0.1 pppd[318]: ppp_add_conn 4 Mar 14 09:31:59 127.0.0.1 pppd[318]: Assigned link id for dedicated link (132.147. 5 118.6->132.147.118.9) is 84
- line 1
- the PPP daemon (shown as ``pppd'' in the logfile) builds the PPP network interface for the link
- line 2
- the PPP daemon links the tty specified in the PPP endpoint configuration under the PPP driver
- line 4,5
- the PPP daemon assigns a link ID (84) to the dedicated link
If ping is successful when using the IP address of the remote host, you may wish to test whether one can reach the remote host using the host names by which it should be reachable. See ``Using ping to test reachability using host names'' for the command, possible error message, and resolutions.
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