update internet sharing post
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@ -9,6 +9,8 @@ categories:
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- ipv6 router advertisement
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---
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**Update:** Added adhoc wlan network
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A guide to connect with a different machine using a ethernet cable for
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internet sharing or just transferring files:
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@ -17,11 +19,12 @@ internet sharing or just transferring files:
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$ pacman -S dnsmasq iproute2
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2. Copy over the configuration files at the end of the article and edit the
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*/etc/conf.d/share-internet* to match your network setup.
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*/etc/conf.d/share-internet@\<device\>* to match your network setup. (where
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\<device\> is your network device)
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3. Start the sharing service with systemd
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$ sudo systemctl start internet-sharing.service
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$ sudo systemctl start internet-sharing@<device>.service
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After that the other machine can connect via dhcp. It will get an ipv4
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address from the **10.20.0.0/24** subnet and a ipv6 address from the **fd21:30c2:dd2f::**
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@ -34,10 +37,26 @@ network with the device on which the dhcp service is running.
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Happy networking!
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{% include_code /etc/conf.d/share-internet lang:bash share-internet/share-internet %}
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{% include_code /etc/systemd/system/share-internet.service lang:ini share-internet/share-internet.service %}
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{% include_code /etc/dnsmasq.conf lang:ini share-internet/dnsmasq.conf %}
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{% include_code /etc/dnsmasq.conf.dhcp lang:bash share-internet/dnsmasq.conf.dhcp %}
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Ethernet to Wlan:
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{% include_code /etc/conf.d/share-internet@enp0s25 lang:bash share-internet/share-internet@enp0s25 %}
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Wlan to Ethernet:
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If you have luck and your wifi driver is capable of the infrastructure mode,
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you should take a look at hostadp, in my case I have to create an adhoc network.
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To enable the adhoc network:
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$ sudo systemctl enable wireless-adhoc@\<device\>.service
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{% include_code /etc/conf.d/share-internet@wlp3s0 lang:bash share-internet/share-internet@wlp3s0 %}
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{% include_code /etc/systemd/system/wireless-adhoc@.service lang:ini share-internet/wireless-adhoc@.service %}
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{% include_code /etc/wpa_supplicant/wpa_supplicant-adhoc-wlp3s0.conf lang:bash share-internet/wpa_supplicant-adhoc-wlp3s0.conf %}
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@ -3,5 +3,3 @@ server=8.8.8.8
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server=8.8.4.4
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no-resolv
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cache-size=2000
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#conf-file=/etc/dnsmasq.conf.dhcp
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@ -1,10 +0,0 @@
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# no need to modify
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# ingoing and outgoing device will be set by the systemd service
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interface=enp0s25
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no-dhcp-interface=wlp3s0
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dhcp-range=10.20.0.100,10.20.0.199,infinite
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dhcp-option=3,10.20.0.1 # router
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dhcp-option=5,10.20.0.1 # dns
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dhcp-option=42,10.20.0.1 # ntp
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dhcp-range=fd21:30c2:dd2f::,ra-stateless,ra-names,infinite
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enable-ra
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@ -1,4 +0,0 @@
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# Network device where other hosts are connect to, ex: eth0
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INTERNAL_DEVICE="enp0s25"
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# Device which has internet access, ex: wlan0 or usb0
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EXTERNAL_DEVICE="wlp3s0"
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@ -1,27 +0,0 @@
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[Unit]
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Description='share internet'
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[Service]
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Type=oneshot
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EnvironmentFile=/etc/conf.d/share-internet
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RemainAfterExit=yes
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ExecStart=/usr/bin/sed -ie 's!^#conf-file=/etc/dnsmasq\.conf\.dhcp!conf-file=/etc/dnsmasq.conf.dhcp!' /etc/dnsmasq.conf
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ExecStart=/usr/bin/sed -ie 's/^interface=[[:alnum:]]+/interface=$INTERNAL_DEVICE/' /etc/dnsmasq.conf.dhcp
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ExecStart=/usr/bin/sed -ie 's/^no-dhcp-interface=[[:alnum:]]+/no-dhcp-interface=$EXTERNAL_DEVICE/' /etc/dnsmasq.conf.dhcp
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ExecStart=/usr/bin/iptables -t nat -A POSTROUTING -o $EXTERNAL_DEVICE -j MASQUERADE
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ExecStart=/usr/bin/ip6tables -t nat -A POSTROUTING -o $EXTERNAL_DEVICE -j MASQUERADE
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ExecStart=/usr/bin/sysctl -w net.ipv4.ip_forward=1 net.ipv6.conf.all.forwarding=1
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ExecStart=/usr/bin/ip addr add 10.20.0.1/24 dev $INTERNAL_DEVICE
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ExecStart=/usr/bin/ip addr add fd21:30c2:dd2f::1/64 dev $INTERNAL_DEVICE
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ExecStart=/usr/bin/systemctl restart dnsmasq
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ExecStop=/usr/bin/ip addr del 10.20.0.1/24 dev $INTERNAL_DEVICE
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ExecStop=/usr/bin/ip addr del fd21:30c2:dd2f::1/64 dev $INTERNAL_DEVICE
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ExecStop=/usr/bin/sysctl -w net.ipv4.ip_forward=0 net.ipv6.conf.all.forwarding=0
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ExecStop=/usr/bin/iptables -t nat -D POSTROUTING -o $EXTERNAL_DEVICE -i $INTERNAL_DEVICE -j MASQUERADE
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ExecStop=/usr/bin/ip6tables -t nat -D POSTROUTING -o $EXTERNAL_DEVICE -i $INTERNAL_DEVICE -j MASQUERADE
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ExecStop=/usr/bin/sed -ie 's!^conf-file=/etc/dnsmasq\.conf\.dhcp!#conf-file=/etc/dnsmasq.conf.dhcp!' /etc/dnsmasq.conf
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ExecStop=/usr/bin/systemctl restart dnsmasq
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[Install]
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WantedBy=multi-user.target
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@ -0,0 +1,35 @@
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[Unit]
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Description='share internet'
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Conflicts=dnsmasq.service
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Wants=network.target
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Before=network.target
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BindsTo=sys-subsystem-net-devices-%i.device
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After=sys-subsystem-net-devices-%i.device
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[Service]
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Type=simple
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EnvironmentFile=/etc/conf.d/share-internet@%i
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ExecStartPre=/usr/bin/dnsmasq --test
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ExecStartPre=/usr/bin/iptables -t nat -A POSTROUTING -o $EXTERNAL_DEVICE -j MASQUERADE
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ExecStartPre=/usr/bin/ip6tables -t nat -A POSTROUTING -o $EXTERNAL_DEVICE -j MASQUERADE
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ExecStartPre=/usr/bin/sysctl -w net.ipv4.ip_forward=1 net.ipv6.conf.all.forwarding=1
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ExecStartPre=/usr/bin/ip link set %i up
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ExecStartPre=/usr/bin/ip addr add ${IP4_ADDRESS}/${IP4_NETMASK} dev %i
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ExecStartPre=/usr/bin/ip addr add ${IP6_ADDRESS}/${IP4_NETMASK} dev %i
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ExecStart=/usr/bin/dnsmasq -k --user=dnsmasq --pid-file \
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--conf-file=/etc/dnsmasq.conf \
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--interface=%i \
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--dhcp-range=${IP4_SUBNET},infinite \
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--dhcp-range=${IP6_SUBNET},ra-stateless,ra-names,infinite \
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--dhcp-option=3,${IP4_ADDRESS} \
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--dhcp-option=5,${IP4_ADDRESS} \
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--enable-ra \
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--no-daemon
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ExecReload=/bin/kill -HUP $MAINPID
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ExecStopPost=/usr/bin/ip addr flush dev %i
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ExecStopPost=/usr/bin/ip link set %i down
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ExecStopPost=/usr/bin/sysctl -w net.ipv4.ip_forward=0 net.ipv6.conf.all.forwarding=0
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ExecStopPost=/usr/bin/iptables -t nat -D POSTROUTING -o $EXTERNAL_DEVICE -j MASQUERADE
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ExecStopPost=/usr/bin/ip6tables -t nat -D POSTROUTING -o $EXTERNAL_DEVICE -j MASQUERADE
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@ -0,0 +1,10 @@
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# Device which has internet access, ex: wlan0 or usb0
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EXTERNAL_DEVICE="wlp3s0"
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IP4_ADDRESS="10.20.0.1"
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IP4_NETMASK="24"
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IP4_SUBNET="10.20.0.2,10.20.0.255"
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IP6_ADDRESS="fd21:30c2:dd2f::1"
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IP6_NETMASK="64"
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IP6_SUBNET="fd21:30c2:dd2f::"
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@ -0,0 +1,10 @@
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# Device which has internet access, ex: wlan0 or usb0
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EXTERNAL_DEVICE="enp0s20u2"
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IP4_ADDRESS="10.20.0.1"
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IP4_NETMASK="24"
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IP4_SUBNET="10.20.0.100,10.20.0.199"
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IP6_ADDRESS="fd21:30c2:dd2f::1"
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IP6_NETMASK="64"
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IP6_SUBNET="fd21:30c2:dd2f::"
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@ -0,0 +1,15 @@
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[Unit]
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Description=Ad-hoc wireless network connectivity (%i)
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Wants=network.target
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Before=network.target
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Conflicts=netctl-auto@.service
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BindsTo=sys-subsystem-net-devices-%i.device
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After=sys-subsystem-net-devices-%i.device
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[Service]
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Type=simple
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ExecStartPre=/usr/bin/rfkill unblock wifi
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ExecStart=/usr/sbin//wpa_supplicant -D nl80211,wext -c/etc/wpa_supplicant/wpa_supplicant-adhoc-%I.conf -i%I
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[Install]
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RequiredBy=share-internet@%i.service
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@ -0,0 +1,29 @@
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ctrl_interface=DIR=/run/wpa_supplicant GROUP=wheel
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# use 'ap_scan=2' on all devices connected to the network
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ap_scan=2
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network={
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ssid="The.Secure.Network"
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mode=1
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frequency=2432
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proto=WPA
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key_mgmt=WPA-NONE
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pairwise=NONE
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group=TKIP
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psk="fnord"
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}
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# MacOS X and Networmanager aren't capable of using WPA/WPA2 for Adhoc Networks
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#network={
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# ssid="The.Insecure.Network"
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# mode=1
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# frequency=2432
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# proto=WPA
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# key_mgmt=NONE
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# pairwise=NONE
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# group=TKIP
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#
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# wep_key0="fnord"
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# wep_tx_keyidx=0
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#}
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