Switches to use with common TCP/IP utilities:

ARP

Used to gather hardware addresses of local hosts and the default gateway, you can view the ARP cache and check for invalid or duplicate entries.

• Command Syntax
  • arp -a [inet_addr] [-N [if_addr]]
  • arp -d inet_addr [if_addr]
  • arp -s inet_addr ether_addr [if_addr]
• Command Switches
  • -a or -g: displays the current contents of the arp cache.
  • –d: deletes the entry specified by inet_addr.
  • –s: adds a static entry to the cache, mapping an IP address to a physical address.
  • –N: displays the arp entries for the specified physical address.
  • inet_addr: IP address, written in dotted decimal format.
  • if_addr: IP address of the NIC whose cache should be modified, if no IP address, the first NIC is used
  • ether_addr: the physical address in hex separated by hyphens

Telnet

This is a terminal emulation program that will allow you to run interactive commands on the telnet server. Until a connection is established, no data will pass and if the connection should break telnet will inform you. Good for testing login configuration parameters to a remote host.

• Command Syntax
  • Telnet.

NBTSTAT

Reports statistics and connections for NetBIOS over TCP/IP. Used for DNS and WINS name resolution, local cache lookup, and referral to LMHOSTS and HOSTS files. Troubleshoots name-to-address mappings.

• Command Syntax
  • Nbtstat [-a remotename] [ -A IPaddress] [-c] [-n] [-R] [-r] [-S] [-s] [interval]
• Command Switches
  • -a remotename: lists the remote computer's name table by the remote computer's name.
  • -A IP address: lists the remote computer's name table by the remote computer's IP address.
  • –c: lists the contents of the name cache, mapping each IP address to a name.
  • –n: lists local NetBIOS names.
  • –R: if LMHOSTS lookup is enabled, then it will purge the name cache and reload it from the LMHOSTS file.
  • –r: lists name-resolution statistics for Windows networking.
  • -S - displays workstation and server sessions, listing hosts by IP address.
  • –s: displays workstation and server sessions, attempting to list hosts by name.
  • interval: the number of seconds between refreshes of statistics.

Tracert

Used to determine the route a packet took to reach its destination.

• Command Syntax
  • Tracert [-d] [-h maximum_hops] [-j host-list] [-w timeout] target_name
• Command Switches
  • –d: specifies that IP addresses should not be resolved to host name.
  • -h maximum_hops - can only search up to the specified number of hops.
  • -j host-list: specifies the loose source route.
  • -w timeout: waits the number of milliseconds specified by timeout for each reply.