Re: Creating a tap device.
TL-DR. On 3/14/2021 4:54 PM, pe...@easthope.ca wrote: From: "Alexander V. Makartsev" Date: Sun, 14 Mar 2021 11:41:47 +0500 But it wasn't creating a device with chosen name anywhere under "/dev" or "/dev/net/". I believe, "/dev/net/tun" device is created when "tun" kernel module is inserted. Crucial tip. Thanks Alexander. Consequently I made these arrangements. (1) Put "tun" in /etc/modules. peter@joule:/home/peter$ grep tun /etc/modules tun Is the tun module also for the tap module? I could be rong but I would not mix both of them. (2) Put "@reboot ip tuntap add mode tap tap0" in /etc/crontab. peter@joule:/home/peter$ grep tap /etc/crontab @reboot ip tuntap add mode tap tap0 (3) Reboot. (4) Verify that tap0 is present. peter@joule:/home/peter$ ip link show dev tap0 6: tap0: mtu 1500 qdisc pfifo_fast state UP mo de DEFAULT group default qlen 1000 link/ether 0a:c1:8e:81:78:aa brd ff:ff:ff:ff:ff:ff Good. Tomorrow will try a few more steps. Note that with Libvirt and simply creating a bridge, makes guests visible on the network. -- John Doe
Re: Creating a tap device.
From: deloptes Date: Sun, 14 Mar 2021 09:49:24 +0100 > I spent also some time finding a suitable way to configure qemu (for > aarch64), so came to the bridge interface option as this way I can do a > diskless setup. Thanks, ... P. -- cell: +1 236 464 1479Bcc: peter at easthope. ca VoIP: +1 604 670 0140
Re: Creating a tap device.
From: "Alexander V. Makartsev" Date: Sun, 14 Mar 2021 11:41:47 +0500 > But it wasn't creating a device with chosen name anywhere under "/dev" or > "/dev/net/". > I believe, "/dev/net/tun" device is created when "tun" kernel module is > inserted. Crucial tip. Thanks Alexander. Consequently I made these arrangements. (1) Put "tun" in /etc/modules. peter@joule:/home/peter$ grep tun /etc/modules tun (2) Put "@reboot ip tuntap add mode tap tap0" in /etc/crontab. peter@joule:/home/peter$ grep tap /etc/crontab @reboot ip tuntap add mode tap tap0 (3) Reboot. (4) Verify that tap0 is present. peter@joule:/home/peter$ ip link show dev tap0 6: tap0: mtu 1500 qdisc pfifo_fast state UP mo de DEFAULT group default qlen 1000 link/ether 0a:c1:8e:81:78:aa brd ff:ff:ff:ff:ff:ff Good. Tomorrow will try a few more steps. Thanks again, P. -- cell: +1 236 464 1479Bcc: peter at easthope. ca VoIP: +1 604 670 0140
Re: Creating a tap device.
pe...@easthope.ca wrote: > My previous message was meant for another list. Apology for the > disturbance. > > I've set aside the instructions for qemu. Trying to understand how a > tap device is created. "man ip" has minimal explanation of "ip tuntap". > > https://stackoverflow.com/questions/15626088/tap-interfaces-and-dev-net-tun-device-using-ip-tuntap-command > prompts this. > > peter@joule:/home/peter$ sudo ip tuntap add mode tap tap0 > [sudo] password for peter: > open: No such file or directory > > peter@joule:/home/peter$ ls -ld /dev/tu* > lrwxrwxrwx 1 root root 12 Mar 13 07:34 /dev/tun -> /dev/net/tun > > Can anyone succeed to create a tap device using ip in Debian 10? > > Thx,... P. I spent also some time finding a suitable way to configure qemu (for aarch64), so came to the bridge interface option as this way I can do a diskless setup. note whoami -> is the user you intend to run the qemu and you can replace eth0 with your ether device == TAP NETWORK == Setup Create a bridge brctl addbr br0 Clear IP of eth0 ip addr flush dev eth0 Add eth0 to bridge brctl addif br0 eth0 Create tap interface tunctl -t tap0 -u `whoami` Add tap0 to bridge brctl addif br0 tap0 Make sure everything is up ifconfig eth0 up ifconfig tap0 up ifconfig br0 up Check if properly bridged brctl show Assign ip to br0 dhclient -v br0 Cleanup Remove tap interface tap0 from bridge br0 brctl delif br0 tap0 Delete tap0 tunctl -d tap0 Remove eth0 from bridge brctl delif br0 eth0 Bring bridge down ifconfig br0 down Remove bridge brctl delbr br0 Bring eth0 up ifconfig eth0 up Check if an IP is assigned to eth0, if not request one dhclient -v eth0 https://wiki.qemu.org/Documentation/Networking https://www.qemu.org/2018/05/31/nic-parameter/
Re: Creating a tap device.
On 14.03.2021 09:55, pe...@easthope.ca wrote: My previous message was meant for another list. Apology for the disturbance. I've set aside the instructions for qemu. Trying to understand how a tap device is created. "man ip" has minimal explanation of "ip tuntap". https://stackoverflow.com/questions/15626088/tap-interfaces-and-dev-net-tun-device-using-ip-tuntap-command prompts this. peter@joule:/home/peter$ sudo ip tuntap add mode tap tap0 [sudo] password for peter: open: No such file or directory peter@joule:/home/peter$ ls -ld /dev/tu* lrwxrwxrwx 1 root root 12 Mar 13 07:34 /dev/tun -> /dev/net/tun Can anyone succeed to create a tap device using ip in Debian 10? Thx,... P. I can. $ sudo ip tuntap add mode tap ether0-tap $ sudo ip tuntap list virbr1-nic: tap persist ether0-tap: tap persist $ sudo ip link list 1: lo: mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: ether0: mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 1c:1b:0d:01:02:03 brd ff:ff:ff:ff:ff:ff 3: virbr1: mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000 link/ether 52:54:00:01:02:03 brd ff:ff:ff:ff:ff:ff 4: virbr1-nic: mtu 1500 qdisc pfifo_fast master virbr1 state DOWN mode DEFAULT group default qlen 1000 link/ether 52:54:00:01:02:03 brd ff:ff:ff:ff:ff:ff 5: ether0-tap: mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 7e:63:1e:70:cf:c2 brd ff:ff:ff:ff:ff:ff $ sudo ip tuntap del mode tap ether0-tap $ sudo ip tuntap list virbr1-nic: tap persist But it wasn't creating a device with chosen name anywhere under "/dev" or "/dev/net/". I believe, "/dev/net/tun" device is created when "tun" kernel module is inserted. -- With kindest regards, Alexander. ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org ⠈⠳⣄
Creating a tap device.
My previous message was meant for another list. Apology for the disturbance. I've set aside the instructions for qemu. Trying to understand how a tap device is created. "man ip" has minimal explanation of "ip tuntap". https://stackoverflow.com/questions/15626088/tap-interfaces-and-dev-net-tun-device-using-ip-tuntap-command prompts this. peter@joule:/home/peter$ sudo ip tuntap add mode tap tap0 [sudo] password for peter: open: No such file or directory peter@joule:/home/peter$ ls -ld /dev/tu* lrwxrwxrwx 1 root root 12 Mar 13 07:34 /dev/tun -> /dev/net/tun Can anyone succeed to create a tap device using ip in Debian 10? Thx,... P. -- cell: +1 236 464 1479Bcc: peter at easthope. ca VoIP: +1 604 670 0140
