What is the most efficient way to get all of the external ip address of a machine with multiple nics, using python? I understand that an external server is neeeded (I have one available) but am un able to find a way to find a good way to specify the nic to use for the connection (So I can use a for loop to iterate through the various nics). Any advice about the best way to go about this?
You should use netifaces. It is designed to be cross-platform on Mac OS X, Linux, and Windows.
>>> import netifaces as ni
>>> ni.interfaces()
['lo', 'eth0', 'eth1', 'vboxnet0', 'dummy1']
>>> ni.ifaddresses('eth0')
{17: [{'broadcast': 'ff:ff:ff:ff:ff:ff', 'addr': '00:02:55:7b:b2:f6'}], 2: [{'broadcast': '24.19.161.7', 'netmask': '255.255.255.248', 'addr': '24.19.161.6'}], 10: [{'netmask': 'ffff:ffff:ffff:ffff::', 'addr': 'fe80::202:55ff:fe7b:b2f6%eth0'}]}
>>>
>>> ni.ifaddresses.__doc__
'Obtain information about the specified network interface.\n\nReturns a dict whose keys are equal to the address family constants,\ne.g. netifaces.AF_INET, and whose values are a list of addresses in\nthat family that are attached to the network interface.'
>>> # for the IPv4 address of eth0
>>> ni.ifaddresses('eth0')[2][0]['addr']
'24.19.161.6'
The numbers used to index protocols are from /usr/include/linux/socket.h (in Linux)...
#define AF_INET 2 /* Internet IP Protocol */
#define AF_INET6 10 /* IP version 6 */
#define AF_PACKET 17 /* Packet family */
For the general case, there is no solution. Consider the case where the local machine is behind a machine with two IP addresses doing NAT. You can change your local interface to anything you like, but it's unlikely that you'll convince the NAT machine to make a different routing decision on its outgoing connections.
Required: WMI / PyWin32 (https://sourceforge.net/projects/pywin32/)
Use the following snippet to get the IP of the network card(s) on Windows.
import wmi
c = wmi.WMI()
for interface in c.Win32_NetworkAdapterConfiguration(IPEnabled=1):
print("Description: " + interface.Description)
print("IP: " + str(interface.IPAddress[0]))
print("MAC: " + str(interface.IPAddress[1]))
For more information on what parameters you can provide Win32_NetworkAdapterConfiguration with visit: https://msdn.microsoft.com/en-us/library/aa394217(v=vs.85).aspx
Get address of all NICs without any external package
import socket
print socket.gethostbyname_ex(socket.gethostname())[2]
Use the subprocess module to connect to your usual systems tools like ifconfig or netstat:
>>> import subprocess
>>> print subprocess.check_output(['ifconfig'])
来源：https://stackoverflow.com/questions/8281371/python-how-to-get-all-external-ip-addresses-with-multiple-nics