[FS#3207] Setting MTU on Bridged interfaces does not set MTU on member interfaces

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FS#3207 - Setting MTU on Bridged interfaces does not set MTU on member interfaces
User who did this - Mike Klemencic (MikeKlem)

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  ~ ip link |grep -C 3 br-lan
    link/ether d8:58:d7:01:03:c4 brd ff:ff:ff:ff:ff:ff
4: eth2:  mtu 9000 qdisc mq state UP qlen 532
    link/ether 00:e0:a6:de:ca:de brd ff:ff:ff:ff:ff:ff
5: lan0 at eth1:  mtu 1500 qdisc noqueue master br-lan state UP qlen 1000
    link/ether d8:58:d7:01:03:c4 brd ff:ff:ff:ff:ff:ff
6: lan1 at eth1:  mtu 1500 qdisc noqueue master br-lan state UP qlen 1000
    link/ether d8:58:d7:01:03:c4 brd ff:ff:ff:ff:ff:ff
7: lan2 at eth1:  mtu 1500 qdisc noqueue master br-lan state UP qlen 1000
    link/ether d8:58:d7:01:03:c4 brd ff:ff:ff:ff:ff:ff
8: lan3 at eth1:  mtu 1500 qdisc noqueue master br-lan state UP qlen 1000
    link/ether d8:58:d7:01:03:c4 brd ff:ff:ff:ff:ff:ff
9: lan4 at eth0:  mtu 9000 qdisc noqueue state UP qlen 1000
    link/ether 00:e0:a6:de:c1:de brd ff:ff:ff:ff:ff:ff
--
    link/ether 92:39:95:ed:a6:78 brd ff:ff:ff:ff:ff:ff
20: br-iwan:  mtu 1500 qdisc noqueue state DOWN qlen 1000
    link/ether 2e:a9:e3:96:13:64 brd ff:ff:ff:ff:ff:ff
21: br-lan:  mtu 1500 qdisc noqueue state UP qlen 1000
    link/ether 04:f0:21:42:16:24 brd ff:ff:ff:ff:ff:ff
27: wlan0:  mtu 1500 qdisc noqueue master br-lan state UP qlen 1000
    link/ether 04:f0:21:42:16:24 brd ff:ff:ff:ff:ff:ff
34: ifb4br-guest_tu:  mtu 1500 qdisc htb state UNKNOWN qlen 32
    link/ether 42:97:94:b6:e2:6f brd ff:ff:ff:ff:ff:ff
37: vethG7BXN4 at if36:  mtu 1500 qdisc noqueue master br-lan state UP qlen 1000
    link/ether fe:83:ba:ac:4d:5b brd ff:ff:ff:ff:ff:ff
39: vethPS8UH3 at if38:  mtu 1500 qdisc noqueue master br-lan state UP qlen 1000
    link/ether fe:6d:4a:e0:03:33 brd ff:ff:ff:ff:ff:ff
➜  ~ ip link set br-lan mtu 9000
ip: SIOCSIFMTU: Invalid argument
➜  ~ sysctl -w net.ipv6.conf.br-lan.mtu=9000
sysctl: write error: Invalid argument
➜  ~ sysctl net.ipv6.conf.br-lan.mtu          
net.ipv6.conf.br-lan.mtu = 1500

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3207#comment10231

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