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233 lines
8.0 KiB
Plaintext
233 lines
8.0 KiB
Plaintext
#
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# Network configuration
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#
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menu "Networking"
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config NET
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bool "Networking support"
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---help---
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Unless you really know what you are doing, you should say Y here.
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The reason is that some programs need kernel networking support even
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when running on a stand-alone machine that isn't connected to any
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other computer.
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If you are upgrading from an older kernel, you
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should consider updating your networking tools too because changes
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in the kernel and the tools often go hand in hand. The tools are
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contained in the package net-tools, the location and version number
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of which are given in <file:Documentation/Changes>.
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For a general introduction to Linux networking, it is highly
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recommended to read the NET-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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# Make sure that all config symbols are dependent on NET
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if NET
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menu "Networking options"
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config NETDEBUG
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bool "Network packet debugging"
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help
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You can say Y here if you want to get additional messages useful in
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debugging bad packets, but can overwhelm logs under denial of service
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attacks.
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source "net/packet/Kconfig"
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source "net/unix/Kconfig"
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source "net/xfrm/Kconfig"
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config INET
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bool "TCP/IP networking"
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---help---
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These are the protocols used on the Internet and on most local
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Ethernets. It is highly recommended to say Y here (this will enlarge
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your kernel by about 144 KB), since some programs (e.g. the X window
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system) use TCP/IP even if your machine is not connected to any
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other computer. You will get the so-called loopback device which
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allows you to ping yourself (great fun, that!).
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For an excellent introduction to Linux networking, please read the
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Linux Networking HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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If you say Y here and also to "/proc file system support" and
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"Sysctl support" below, you can change various aspects of the
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behavior of the TCP/IP code by writing to the (virtual) files in
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/proc/sys/net/ipv4/*; the options are explained in the file
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<file:Documentation/networking/ip-sysctl.txt>.
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Short answer: say Y.
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if INET
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source "net/ipv4/Kconfig"
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source "net/ipv6/Kconfig"
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endif # if INET
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menuconfig NETFILTER
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bool "Network packet filtering (replaces ipchains)"
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---help---
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Netfilter is a framework for filtering and mangling network packets
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that pass through your Linux box.
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The most common use of packet filtering is to run your Linux box as
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a firewall protecting a local network from the Internet. The type of
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firewall provided by this kernel support is called a "packet
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filter", which means that it can reject individual network packets
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based on type, source, destination etc. The other kind of firewall,
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a "proxy-based" one, is more secure but more intrusive and more
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bothersome to set up; it inspects the network traffic much more
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closely, modifies it and has knowledge about the higher level
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protocols, which a packet filter lacks. Moreover, proxy-based
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firewalls often require changes to the programs running on the local
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clients. Proxy-based firewalls don't need support by the kernel, but
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they are often combined with a packet filter, which only works if
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you say Y here.
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You should also say Y here if you intend to use your Linux box as
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the gateway to the Internet for a local network of machines without
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globally valid IP addresses. This is called "masquerading": if one
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of the computers on your local network wants to send something to
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the outside, your box can "masquerade" as that computer, i.e. it
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forwards the traffic to the intended outside destination, but
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modifies the packets to make it look like they came from the
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firewall box itself. It works both ways: if the outside host
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replies, the Linux box will silently forward the traffic to the
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correct local computer. This way, the computers on your local net
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are completely invisible to the outside world, even though they can
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reach the outside and can receive replies. It is even possible to
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run globally visible servers from within a masqueraded local network
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using a mechanism called portforwarding. Masquerading is also often
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called NAT (Network Address Translation).
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Another use of Netfilter is in transparent proxying: if a machine on
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the local network tries to connect to an outside host, your Linux
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box can transparently forward the traffic to a local server,
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typically a caching proxy server.
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Yet another use of Netfilter is building a bridging firewall. Using
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a bridge with Network packet filtering enabled makes iptables "see"
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the bridged traffic. For filtering on the lower network and Ethernet
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protocols over the bridge, use ebtables (under bridge netfilter
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configuration).
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Various modules exist for netfilter which replace the previous
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masquerading (ipmasqadm), packet filtering (ipchains), transparent
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proxying, and portforwarding mechanisms. Please see
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<file:Documentation/Changes> under "iptables" for the location of
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these packages.
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Make sure to say N to "Fast switching" below if you intend to say Y
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here, as Fast switching currently bypasses netfilter.
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Chances are that you should say Y here if you compile a kernel which
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will run as a router and N for regular hosts. If unsure, say N.
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if NETFILTER
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config NETFILTER_DEBUG
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bool "Network packet filtering debugging"
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depends on NETFILTER
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help
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You can say Y here if you want to get additional messages useful in
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debugging the netfilter code.
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config BRIDGE_NETFILTER
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bool "Bridged IP/ARP packets filtering"
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depends on BRIDGE && NETFILTER && INET
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default y
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---help---
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Enabling this option will let arptables resp. iptables see bridged
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ARP resp. IP traffic. If you want a bridging firewall, you probably
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want this option enabled.
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Enabling or disabling this option doesn't enable or disable
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ebtables.
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If unsure, say N.
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source "net/netfilter/Kconfig"
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source "net/ipv4/netfilter/Kconfig"
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source "net/ipv6/netfilter/Kconfig"
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source "net/decnet/netfilter/Kconfig"
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source "net/bridge/netfilter/Kconfig"
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endif
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source "net/dccp/Kconfig"
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source "net/sctp/Kconfig"
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source "net/tipc/Kconfig"
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source "net/atm/Kconfig"
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source "net/bridge/Kconfig"
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source "net/8021q/Kconfig"
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source "net/decnet/Kconfig"
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source "net/llc/Kconfig"
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source "net/ipx/Kconfig"
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source "drivers/net/appletalk/Kconfig"
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source "net/x25/Kconfig"
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source "net/lapb/Kconfig"
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config NET_DIVERT
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bool "Frame Diverter (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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---help---
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The Frame Diverter allows you to divert packets from the
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network, that are not aimed at the interface receiving it (in
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promisc. mode). Typically, a Linux box setup as an Ethernet bridge
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with the Frames Diverter on, can do some *really* transparent www
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caching using a Squid proxy for example.
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This is very useful when you don't want to change your router's
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config (or if you simply don't have access to it).
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The other possible usages of diverting Ethernet Frames are
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numberous:
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- reroute smtp traffic to another interface
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- traffic-shape certain network streams
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- transparently proxy smtp connections
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- etc...
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For more informations, please refer to:
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<http://diverter.sourceforge.net/>
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<http://perso.wanadoo.fr/magpie/EtherDivert.html>
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If unsure, say N.
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source "net/econet/Kconfig"
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source "net/wanrouter/Kconfig"
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source "net/sched/Kconfig"
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menu "Network testing"
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config NET_PKTGEN
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tristate "Packet Generator (USE WITH CAUTION)"
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depends on PROC_FS
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---help---
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This module will inject preconfigured packets, at a configurable
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rate, out of a given interface. It is used for network interface
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stress testing and performance analysis. If you don't understand
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what was just said, you don't need it: say N.
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Documentation on how to use the packet generator can be found
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at <file:Documentation/networking/pktgen.txt>.
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To compile this code as a module, choose M here: the
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module will be called pktgen.
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endmenu
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endmenu
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source "net/ax25/Kconfig"
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source "net/irda/Kconfig"
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source "net/bluetooth/Kconfig"
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source "net/ieee80211/Kconfig"
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config WIRELESS_EXT
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bool
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endif # if NET
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endmenu # Networking
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