How to identifying the network card ?

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ip-netns

IP-NETNS(8)							       Linux							       IP-NETNS(8)

NAME

       ip-netns - process network namespace management

SYNOPSIS

       ip [ OPTIONS ] netns  { COMMAND | help }

       ip netns { list }

       ip netns { add | delete } NETNSNAME

       ip netns exec NETNSNAME command ...

DESCRIPTION

       A network namespace is logically another copy of the network stack, with it's own routes, firewall rules, and network devices.

       By convention a named network namespace is an object at /var/run/netns/NAME that can be opened.	The file descriptor resulting from opening
       /var/run/netns/NAME refers to the specified network namespace.  Holding that file descriptor open keeps the network namespace alive.  The
       file descriptor can be used with the setns(2) system call to change the network namespace associated with a task.

       The convention for network namespace aware applications is to look for global network configuration files first in /etc/netns/NAME/ then in
       /etc/.  For example, if you want a different version of /etc/resolv.conf for a network namespace used to isolate your vpn you would name it
       /etc/netns/myvpn/resolv.conf.

       ip netns exec automates handling of this configuration, file convention for network namespace unaware applications, by creating a mount
       namespace and bind mounting all of the per network namespace configure files into their traditional location in /etc.

   ip netns list - show all of the named network namespaces
   ip netns add NAME - create a new named network namespace
   ip netns delete NAME - delete the name of a network namespace
   ip netns exec NAME cmd ... - Run cmd in the named network namespace
EXAMPLES

SEE ALSO

       ip(8)

AUTHOR

       Original Manpage by Eric W. Biederman

iproute2							    20 Dec 2011 						       IP-NETNS(8)

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