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Network administration tools

  1. #1
    Junior Member
    Join Date
    Jul 2009

    Default Network administration tools


    (as root) A very good menu-driven setup of your network.

    Check if you can contact another machine (give the machine's name or IP), press C when done (it keeps going).

    route -n
    Show the kernel routing table.

    nslookup host_to_find
    Query your default domain name server (DNS) for an Internet name (or IP number) host_to_find. This way you can check if your DNS works. You can also find out the name of the host of which you only know the IP number.

    traceroute host_to_trace
    Have a look how you messages trave to host_to_trace (which is either a host name or IP number).

    ipfwadm -F -p m
    (for RH5.2, seen next command for RH6.0) Set up the firewall IP forwarding policy to masquerading. (Not very secure but simple.) Purpose: all computers from your home network will appear to the outside world as one very busy machine and, for example, you will be allowed to browse the Internet from all computers at once.

    echo 1 > /proc/sys/net/ipv4/ip_forward
    ipfwadm-wrapper -F -p deny
    ipfwadm-wrapper -F -a m -S -D
    (three commands, RH6.0). Does the same as the previous command. Substitute the "x"s with digits of your class "C" IP address that you assigned to your home network. See here for more details. In RH6.1, masquarading seems broken to me--I think I will install Mandrake Linux.

    (as root) Display info on the network interfaces currently active (ethernet, ppp, etc). Your first ethernet should show up as eth0, second as eth1, etc, first ppp over modem as ppp0, second as ppp1, etc. The "lo" is the "loopback only" interface which should be always active. Use the options (see ifconfig --help) to configure the interfaces.

    ifup interface_name
    (/sbin/ifup to it run as a user) Startup a network interface. E.g.:
    ifup eth0
    ifup ppp0
    Users can start up or shutdown the ppp interface only when the right permission was checked during the ppp setup (using netconf ). To start a ppp interface (dial-up connection), I normally use kppp available under kde menu "internet".

    ifdown interface_name
    (/sbin/ifdown to run it as a user). Shut down the network interface. E.g.: ifdown ppp0 Also, see the previous command.

    netstat | more
    Displays a lot (too much?) information on the status of your network.

  2. #2
    Jedi knight Luke Skywalker's Avatar
    Join Date
    Jul 2009


    rep+. Good for noobs.

  3. #3
    Junior Member
    Join Date
    Oct 2009


    hey vasudha..that is a great information, i really don't have any ideas on those things but! i am glad i had register here..its like that i am having tutorials in every sections that i read!

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