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Other Basic Tools
The network manager can also make intelligent use of:
traceroute
- enables the network manager to discover the route taken by IP
datagrams in travelling to a remote host.
netstat
- gives information about the UNIX kernel data structures
associated with TCP/IP. For example,
netstat -r
prints
the kernel routing table, whilst netstat -a
reports on
all current TCP activity.
arp
- reports on all current Address Resolution Protocol (IP to MAC
layer mappings) information. Can be very useful where Proxy-ARP is
in use!
nslookup
, dig
- useful for checking DNS (Name Service) operation. Note that if
DNS is not operational, other tools may still be usable with dotted
IP addresses instead of names.
telnet
- useful for checking operation of the TCP sub-system. In
addition, many network devices (eg, most routers) support telnet
connection by the network manager to check loads, error rates,
etc.
finger
- may be useful to check for existence of this basic TCP service,
also to check for excessive system loads on remote machines.
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