https://takuya-1st.hatenablog.jp/entry/2021/12/13/213423

macvlan on macvlan は動くのか

これを見ていて、ふと愚問が湧いた。ネストしたらどうなるんだろう。

ネストできるのか興味が出たので試した。

作れる。まじか。

macvlan3 on eth0

sudo ip link add macvlan4 link macvlan3 type macvlan mode bridge

macvlan 4 on macvlan3

sudo ip link add macvlan4 link macvlan3 type macvlan mode bridge

dhcp for macvlan4

dhclient -v macvlan4

動く。

takuya@raspi-ubuntu:~$ sudo dhclient -v -r macvlan4
Killed old client process
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/macvlan4/d2:27:17:3a:41:59
Sending on   LPF/macvlan4/d2:27:17:3a:41:59
Sending on   Socket/fallback
DHCPRELEASE of 192.168.2.113 on macvlan4 to 192.168.2.1 port 67 (xid=0x24dec657)```

macvlan3/macvlan4 に同時にdhcpしてみる

41: macvlan3@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 26:c0:ec:88:cc:ec brd ff:ff:ff:ff:ff:ff
    inet 192.168.2.113/24 brd 192.168.2.255 scope global dynamic macvlan3
       valid_lft 43186sec preferred_lft 43186sec
    inet6 fe80::24c0:ecff:fe88:ccec/64 scope link
       valid_lft forever preferred_lft forever
42: macvlan4@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether d2:27:17:3a:41:59 brd ff:ff:ff:ff:ff:ff
    inet 192.168.2.114/24 brd 192.168.2.255 scope global dynamic macvlan4
       valid_lft 43198sec preferred_lft 43198sec
    inet6 fe80::d027:17ff:fe3a:4159/64 scope link
       valid_lft forever preferred_lft forever

まじか。ネストできるんじゃん。

実験環境

takuya@raspi-ubuntu:~$ uname -a
Linux raspi-ubuntu 5.4.0-1046-raspi #50-Ubuntu SMP PREEMPT Thu Oct 28 05:32:10 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux

takuya@raspi-ubuntu:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.3 LTS
Release:        20.04
Codename:       focal