I have a user who cannot access the mainframe and want to know how I can use Netmaster to help diagnose the problem. Is this possible?
If the user has not been able to access the mainframe at all, the stack will never see any inbound packets so Netmaster will be unable to trace what is happening.
However, you can test whether the user's workstation has any connectivity into the mainframe at all. Some of this can be done using Netmaster, other parts cannot, but below are diagnostic steps that can be utilized to diagnose the problem.
He should see something like this
Windows IP Configuration
Ethernet adapter Local Area Connection* 15:
Connection-specific DNS Suffix . : companyx.com
IPv4 Address. . . . . . . . . . . : 192.0.2.12
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 0.0.0.0
Wireless LAN adapter Wireless Network Connection 2:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Wireless LAN adapter Wireless Network Connection:
Connection-specific DNS Suffix . : home
IPv4 Address. . . . . . . . . . . : 192.0.2.1
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
In this instance, the first IP address is the one known by the mainframe (DNS Suffix companyx.com) and the second is the local home IP address
of the PC itself.
Depending on configuration, there may be more than two addresses.
If the IPCONFIG does not show a second IP address, the VPN session may not be working correctly, but you can still try step 4 with all available
IP addresses from the display to verify whether there is any possibility of connectivity to the mainframe.
Try selecting PING and / or Tracert to see if the stack can locate the IP address.
If not, there is nothing further that can be done from Netmaster.
You can also do this in reverse -
Where the hostname is either the hostname or the IP address of your TCP/IP stack
The user should try both.
Traceroute is better than PING in this case as it will show how far the connection attempt gets before timing out.
Is it making it into your network at all or just completely timing out?
If it fails with the hostname and works with the IP address, there may be DNS problems.
This clears out the DNS CACHE on the PC, removing any names that may have been cached with incorrect values, thus allowing hostnames to be resolved