Check Your IP on Windows XP and Vista
To check what IP address is assigned to your windows workstation
WinXP / Vista command:ipconfig
will dispaly all configured interfaces on your workstation.
output:
Windows IP Configuration
Wireless LAN adapter Wireless Network Connection:
Connection-specific DNS Suffix . : Belkin
Link-local IPv6 Address . . . . . : fe80::d988:a1af:c8e6:559d%12
IPv4 Address. . . . . . . . . . . : 192.168.2.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.2.1
Ethernet adapter Local Area Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : Belkin
The output above shows two interfaces "Wireless LAN adapter" and "Ethernet adapter Local" attached to wireless connection and LAN connection.
Renew Your IP Address on windows XP/VISTA
if you see that neither Interfaces are assigned an IP address, you can use the "ipconfig /renew" command which will try to connect to the local DHCP server and get an IP address from this server.
If you have multiple interfaces on your workstation, you can renew an interface by using part of the name example.
ipconfig /renew Bel*
which would renew the IP address of the interface - Bel.
Check your IP address on Linux
To check your IP address on a linux server/workstation use the command:
ifconfig
eth0 Link encap:Ethernet HWaddr FE:FD:40:3E:E4:CF
inet addr:64.62.228.207 Bcast:64.62.228.255 Mask:255.255.255.0
inet6 addr: fe80::fcfd:40ff:fe3e:e4cf/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:7176228 errors:0 dropped:0 overruns:0 frame:0
TX packets:7412838 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1052695156 (1003.9 MiB) TX bytes:1687986180 (1.5 GiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:65478 errors:0 dropped:0 overruns:0 frame:0
TX packets:65478 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:12686839 (12.0 MiB) TX bytes:12686839 (12.0 MiB)
The above command will show all interfaces currently installed on the server/ workstation.
There are a number of options that can be used to show the state of the interface or assign, change certain aspects of the interface.
OPTIONS
interface
The name of the interface. This is usually a driver name followed by a unit number, for exam-
ple eth0 for the first Ethernet interface.
up This flag causes the interface to be activated. It is implicitly specified if an address is
assigned to the interface.
down This flag causes the driver for this interface to be shut down.
[-]arp Enable or disable the use of the ARP protocol on this interface.
[-]promisc
Enable or disable the promiscuous mode of the interface. If selected, all packets on the net-
work will be received by the interface.
[-]allmulti
Enable or disable all-multicast mode. If selected, all multicast packets on the network will
be received by the interface.
metric N
This parameter sets the interface metric.
mtu N This parameter sets the Maximum Transfer Unit (MTU) of an interface.
dstaddr addr
Set the remote IP address for a point-to-point link (such as PPP). This keyword is now obso-
lete; use the pointopoint keyword instead.
netmask addr
Set the IP network mask for this interface. This value defaults to the usual class A, B or C
network mask (as derived from the interface IP address), but it can be set to any value.
add addr/prefixlen
Add an IPv6 address to an interface.
del addr/prefixlen
Remove an IPv6 address from an interface.
tunnel aa.bb.cc.dd
Create a new SIT (IPv6-in-IPv4) device, tunnelling to the given destination.
irq addr
Set the interrupt line used by this device. Not all devices can dynamically change their IRQ
setting.
The above options can be used both on freebsd and Linux servers.
Check your IP address on Freebsd
To check you IP address on a freebsd server/workstation use the command:
ifconfig
xl0: flags=8843 mtu 1500
options=9
inet 172.31.16.5 netmask 0xffffff00 broadcast 172.31.16.255
ether 00:b0:d0:84:97:e5
media: Ethernet autoselect (100baseTX )
status: active
plip0: flags=108810 mtu 1500
lo0: flags=8049 mtu 16384
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
inet6 ::1 prefixlen 128
inet 127.0.0.1 netmask 0xff000000
Configure Network Card (Interface)
To configure your network card, requires root privileges. This can be done from the command line with ifconfig but would cause these changes to disappear after each reboot. To make these changes permananent would require editing /etc/rc.conf file.
With a editor (vi) add an entry for each network card present on the system, example:
ifconfig_xl0="inet 172.31.16.5 netmask 255.255.255.0"
repeat the above command for each interface, replacing eth0 with the name of the interface returned by issuing the ifconfig command.
servers running freebsd or unix servers interfaces can be configured with more that one network IP Address, these are known as aliases or virtual network.
The command to use:
ifconfig_xl0_alias0="inet xxx.xxx.xxx.xxx netmask xxx.xxx.xxx.xxx"
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