Set Linux as router in one command. Able to provide Internet, or create WiFi hotspot. Support transparent proxy (redsocks). Also useful for routing VM/containers.
It wraps iptables, dnsmasq etc. stuff. Use in one command, restore in one command or by control-c (or even by closing terminal window).
Basic features:
- Create a NATed sub-network
- Provide Internet
- DHCP server (and RA)
- Specify what DNS the DHCP server assigns to clients
- DNS server
- Specify upstream DNS (kind of a plain DNS proxy)
- IPv6 (behind NATed LAN, like IPv4)
- Creating WiFi hotspot:
- Channel selecting
- Choose encryptions: WPA2/WPA, WPA2, WPA, No encryption
- Create AP on the same interface you are getting Internet (usually require same channel)
- Transparent proxy (redsocks)
- Transparent DNS proxy (hijack port 53 packets)
- Detect NetworkManager and make sure it won't interfere (handle interface (un)managed status)
- You can run many instances, to create many different networks. Has instances managing feature.
For many other features, see below CLI usage
Internet----(eth0/wlan0)-Linux-(wlanX)AP
|--client
|--client
Internet
WiFi AP(no DHCP) |
|----(wlan1)-Linux-(eth0/wlan0)------
| (DHCP)
|--client
|--client
Internet
Switch |
|---(eth1)-Linux-(eth0/wlan0)--------
|--client
|--client
Internet----(eth0/wlan0)-Linux-(eth1)------Another PC
Internet----(eth0/wlan0)-Linux-(virtual interface)-----VM/container
sudo lnxrouter -i eth1
no matter which interface (other than eth1) you're getting Internet from.
sudo lnxrouter --ap wlan0 MyAccessPoint -p MyPassPhrase
no matter which interface you're getting Internet from (even from wlan0). Will create virtual Interface x0wlan0 for hotspot.
Clients access Internet through only isp5
sudo lnxrouter -i eth1 -o isp5 --no-dns --dhcp-dns 1.1.1.1 -6 --dhcp-dns6 [2606:4700:4700::1111]
In this case of usage, it's recommended to:
- Stop serving local DNS
- Tell clients which DNS to use ISP5's DNS. (Or, a safe public DNS, like above example)
Also, read Notice 1
sudo lnxrouter -n -i eth1
sudo lnxrouter -n --ap wlan0 MyAccessPoint -p MyPassPhrase
Read Notice 1
Create a bridge
sudo brctl addbr lxcbr5
In LXC container config
lxc.network.type = veth
lxc.network.flags = up
lxc.network.link = lxcbr5
lxc.network.hwaddr = xx:xx:xx:xx:xx:xx
sudo lnxrouter -i lxcbr5
All clients' Internet traffic go through, for example, Tor (notice this example is NOT an anonymity use)
sudo lnxrouter -i eth1 --tp 9040 --dns 9053 -g 192.168.55.1 -6 --p6 fd00:5:6:7::
In torrc
TransPort 192.168.55.1:9040
DNSPort 192.168.55.1:9053
TransPort [fd00:5:6:7::1]:9040
DNSPort [fd00:5:6:7::1]:9053
Warn: Tor's anonymity relies on a purpose-made browser. Using Tor like this (sharing Tor's network to LAN clients) will NOT ensure anonymity.
Although we use Tor as example here, Linux-router does NOT ensure nor is NOT aiming at anonymity.
To not give our infomation to clients. Clients can still access Internet.
sudo lnxrouter -i eth1 \
--tp 9040 --dns 9053 \
--random-mac \
--ban-priv \
--catch-dns --log-dns # optional
Linux-router comes with no warranty. Use on your own risk
Create a bridge
sudo brctl addbr lxdbr5
Create and add a new LXD profile overriding container's eth0
lxc profile create profile5
lxc profile edit profile5
### profile content ###
config: {}
description: ""
devices:
eth0:
name: eth0
nictype: bridged
parent: lxdbr5
type: nic
name: profile5
lxc profile add <container> profile5
sudo lnxrouter -i lxdbr5 --tp 9040 --dns 9053
To remove that new profile from container
lxc profile remove <container> profile5
Add new eth0 to container overriding default eth0
lxc config device add <container> eth0 nic name=eth0 nictype=bridged parent=lxdbr5
To remove the customized eth0 to restore default eth0
lxc config device remove <container> eth0
In VirtualBox's global settings, create a host-only network vboxnet5 with DHCP disabled.
sudo lnxrouter -i vboxnet5 --tp 9040 --dns 9053
Create a bridge
sudo brctl addbr firejail5
sudo lnxrouter -i firejail5 -g 192.168.55.1 --tp 9040 --dns 9053
firejail --net=firejail5 --dns=192.168.55.1 --blacklist=/var/run/nscd
Firejail's /etc/resolv.conf doesn't obtain DNS from DHCP, so we need to assign.
nscd is domain name cache service, which shouldn't be accessed from in jail here.
Usage: lnxrouter <options>
Options:
-h, --help Show this help
--version Print version number
-i <interface> Interface to make NATed sub-network,
and to provide Internet to
(To create WiFi hotspot use '--ap' instead)
-o <interface> Specify an inteface to provide Internet from.
(See Notice 1)
(Note using this with default DNS option may leak
queries to other interfaces)
-n Do not provide Internet (See Notice 1)
--ban-priv Disallow clients to access my private network
-g <ip> This host's IPv4 address in subnet (mask is /24)
(example: '192.168.5.1' or '5' shortly)
-6 Enable IPv6 (NAT)
--no4 Disable IPv4 Internet (not forwarding IPv4)
(See Notice 1). Usually used with '-6'
--p6 <prefix> Set IPv6 LAN address prefix (length 64)
(example: 'fd00:0:0:5::' or '5' shortly)
Using this enables '-6'
--dns <ip>|<port>|<ip:port>
DNS server's upstream DNS.
Use ',' to seperate multiple servers
(default: use /etc/resolve.conf)
(Note IPv6 addresses need '[]' around)
--no-dns Do not serve DNS
--no-dnsmasq Disable dnsmasq server (DHCP, DNS, RA)
--catch-dns Transparent DNS proxy, redirect packets(TCP/UDP)
whose destination port is 53 to this host
--log-dns Show DNS query log (dnsmasq)
--dhcp-dns <IP1[,IP2]>|no
Set IPv4 DNS offered by DHCP (default: this host).
--dhcp-dns6 <IP1[,IP2]>|no
Set IPv6 DNS offered by DHCP (RA)
(default: this host)
(Note IPv6 addresses need '[]' around)
Using both above two will enable '--no-dns'
--hostname <name> DNS server associate this name with this host.
Use '-' to read name from /etc/hostname
-d DNS server will take into account /etc/hosts
-e <hosts_file> DNS server will take into account additional
hosts file
--dns-nocache DNS server no cache
--mac <MAC> Set MAC address
--random-mac Use random MAC address
--tp <port> Transparent proxy,
redirect non-LAN TCP and UDP(not tested) traffic to
port. (usually used with '--dns')
WiFi hotspot options:
--ap <wifi interface> <SSID>
Create WiFi access point
-p, --password <password>
WiFi password
--qr Show WiFi QR code in terminal (need qrencode)
--hidden Hide access point (not broadcast SSID)
--no-virt Do not create virtual interface
Using this you can't use same wlan interface
for both Internet and AP
--virt-name <name> Set name of virtual interface
-c <channel> Channel number (default: 1)
--country <code> Set two-letter country code for regularity
(example: US)
--freq-band <GHz> Set frequency band: 2.4 or 5 (default: 2.4)
--driver Choose your WiFi adapter driver (default: nl80211)
-w <WPA version> '2' for WPA2, '1' for WPA, '1+2' for both
(default: 2)
--psk Use 64 hex digits pre-shared-key instead of
passphrase
--mac-filter Enable WiFi hotspot MAC address filtering
--mac-filter-accept Location of WiFi hotspot MAC address filter list
(defaults to /etc/hostapd/hostapd.accept)
--hostapd-debug <level> 1 or 2. Passes -d or -dd to hostapd
--isolate-clients Disable wifi communication between clients
--ieee80211n Enable IEEE 802.11n (HT)
--ieee80211ac Enable IEEE 802.11ac (VHT)
--ht_capab <HT> HT capabilities (default: [HT40+])
--vht_capab <VHT> VHT capabilities
--no-haveged Do not run haveged automatically when needed
Instance managing:
--daemon Run in background
-l, --list-running Show running instances
--lc, --list-clients <id|interface>
List clients of an instance. Or list neighbors of
an interface, even if it isn't handled by us.
(passive mode)
--stop <id> Stop a running instance
For <id> you can use PID or subnet interface name.
You can get them with '--list-running'
Notice 1: This script assume your host's default policy won't forward
packets, so the script won't explictly ban forwarding in any
mode. In some unexpected case (eg. mistaken configurations) may
cause unwanted packets leakage between 2 networks, which you
should be aware of if you want isolated network
On exit of a linux-router instance, script will do cleanup, i.e. undo most changes to system. Though, some changes (if needed) will not be undone, which are:
/proc/sys/net/ipv4/ip_forward = 1and/proc/sys/net/ipv6/conf/all/forwarding = 1- dnsmasq in Apparmor complain mode
- hostapd in Apparmor complain mode
- Kernel module
nf_nat_pptploaded - The wifi device which is used to create hotspot is
rfkill unblocked - WiFi country code, if user assigns
1-file-script. Download and run (meet the dependencies).
I'm currently not packaging for any distro. If you do, open a PR and add the link (can be with a version badge) to list here:
| Linux distro | |
|---|---|
| Any | download 1-file-script and run |
- bash
- procps or procps-ng
- iproute2
- dnsmasq
- iptables (or nftables with
iptables-nfttranslation linked) - WiFi hotspot dependencies
- hostapd
- iw
- iwconfig (you only need this if 'iw' can not recognize your adapter)
- haveged (optional)
Sooner is better:
- Detect firewalld and make sure it won't interfere our interface
Future:
- WPA3
- Global IPv6
- Explictly ban forwarding if not needed
- Bring bridging method back
linux-router is LGPL licensed
linux-router
Copyright (C) 2018 garywill
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Upstream create_ap was BSD licensed
Copyright (c) 2013, oblique
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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