Transcript TCP/ IP Trouble

Troubleshooting TCP/IP
COSC513 FALL
By :Ming Wei
TCP/IP Problems can be
grouped into 4 categories
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1. Configuration:
If your network configuration is
incorrect, it can result in one or more
services not starting when you bring
up your NT Workstation or Server.
TCP/IP Problems can be
grouped into 4 categories

2. IP Addressing
The host can hang up when trying to
communicate with other hosts.
This could be caused by the
existence of an improper subnet
address or duplicate IP address.
TCP/IP Problems can be
grouped into 4 categories

3. Subnet addressing
If your host has an improper subnet
address assigned to it, it may not
be able to talk to other local or
remote hosts.
TCP/IP Problems can be
grouped into 4 categories

4. Resolution
You can ping a host with an IP
address, or connect to a network
drive using a host’s IP address, but
you cannot establish a connection
using only its host name.
Tools for diagnosis
PING
ARP
NETSTAT
NBTSTAT
IPCONFIG TRACERT
ROUTE
EVENTLOG NSLOOKUP
REGISTRY
EDITOR
PERFORMANCE
MONITOR
NETWORK
MONITOR
Example (USE PING…)
PING utility can be used to query
another IP device on the network and
determine if the IP address is “alive”,
how long it takes a packet to reach
the device.

Syntax:
ping [-t] [-a] [-n count] [-1 size] [-f] [-i
TTL] [-v TOS] [-r count] [-s count]
[-s count] [-j host-list] [-w timeout]
destination IP list
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If a device is having problems
communication on the network, enter
the following command at the DOS
prompt:
ping 127.0.0.1
The address is the loopback address. So if the device
can’t see it’s own TCP/IP stack, the device can’t
communication on the network.
!!! You don’t want to use the -t parameter unless you
want to track and manually terminate the ping test.
This parameter cause a continuous transmission of
ping packets and may generate significant traffic on
the network.
Another example: (FTP)

Suppose a user on network
130.59.0.0 typed the FTP
command to begin a file transfer to
the CORPFS1 Server. The
workstation convert it into a valid
packet, it must contains the
destination port number,
destination IP address, and MAC
address.
Another example (FTP)
Conclusion...
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
Get familiar with all of TCP/IP
utilities and keep looking for new
tools are the key to troubleshoot
TCP/IP based network.
Thank you for your time, and
welcome to read my paper and
share your comments with me.