Linux-router
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.
Features
Basic features:
- Create a NATed sub-network
- Provide Internet
- DHCP server and RA
- DNS server
- IPv6 (NAT only for now)
- Creating Wifi hotspot:
- Channel selecting
- Choose encryptions: WPA2/WPA, WPA2, WPA, No encryption
- Hidden SSID
- Create AP on the same interface you are getting Internet (require same channel)
- Transparent proxy (redsocks)
- DNS proxy
- Compatible with NetworkManager (automatically set interface as unmanaged)
For many other features, see below CLI usage
Useful in these situations
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
Usage
Provide Internet to an interface
# lnxrouter -i eth1
Provide an interface's Internet to another interface
# lnxrouter -i eth1 -o vpn0 --dhcp-dns 1.1.1.1
Create Wifi hotspot
# lnxrouter --ap wlan0 MyAccessPoint --password MyPassPhrase
LAN without Internet
# lnxrouter -n -i eth1
# lnxrouter -n --ap wlan0 MyAccessPoint --password MyPassPhrase
Transparent proxy with Tor
# lnxrouter -i eth1 --tp 9040 --dns 9053
In torrc
TransPort 0.0.0.0:9040
DNSPort 0.0.0.0:9053
TransPort [::]:9040
DNSPort [::]:9053
Internet for LXC
Create a bridge
# 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
# lnxrouter -i lxcbr5
Use as transparent proxy for LXD
Create a bridge
# brctl addbr lxdbr5
Create and add LXD profile
$ 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
That should make one container have 2 profiles. profile5 will override container'seth0.
# lnxrouter -i lxdbr5 --tp 9040 --dns 9053
To remove that new profile from container
$ lxc profile remove <container> profile5
To not use profile
Add device 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
Use as transparent proxy for VirtualBox
On VirtualBox's global settings, create a host-only network vboxnet5 with DHCP disabled.
# lnxrouter -i vboxnet5 --tp 9040 --dns 9053
Use as transparent proxy for firejail
Create a bridge
# brctl addbr firejail5
# lnxrouter -i firejail5 -g 192.168.55.1 --tp 9040 --dns 9053
$ firejail --net=firejail5 --dns=192.168.55.1 --blacklist=/var/run/nscd
CLI usage and other features
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.
(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> Set this host's IPv4 address, netmask is 24
-6 Enable IPv6 (NAT)
--no4 Disable IPv4 Internet (not forwarding IPv4)
(See Notice 1). Usually used with '-6'
--p6 <prefix> Set IPv6 prefix (length 64) (example: fd00:1:2:3::)
--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
--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)
--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
--mac <MAC> Set MAC address
--tp <port> Transparent proxy,
redirect non-LAN TCP and UDP traffic to port.
Usually used with '--dns'
Wifi hotspot options:
--ap <wifi interface> <SSID>
Create Wifi access point
--password <password> Wifi password
--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
-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> Use 1 for WPA, use 2 for WPA2, use 1+2 for both
(default: 1+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
--list-running Show running instances
--list-clients <id> List clients of an instance
--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 case may cause unwanted communication between 2
networks, which you should check if you want isolated network
These changes to system will not be restored by script's cleanup:
/proc/sys/net/ipv4/ip_forward = 1and/proc/sys/net/ipv6/conf/all/forwarding = 1, needed by NAT Internet sharing.- dnsmasq in Apparmor complain mode
Dependencies
- bash
- procps or procps-ng
- iproute2
- dnsmasq
- iptables
Wifi hotspot:
- hostapd
- iw
- iwconfig (you only need this if 'iw' can not recognize your adapter)
- haveged (optional)
TODO
- Option to randomize MAC
- Explictly ban forwarding if not needed
Donate
Buy me a coffee , this project took me lots of time!
（ ^^）o自自o（^^ ）
No? Okay, or just give me a star!
Thanks
Many thanks to project create_ap.