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Can't change MTU on eth0 (WAN)

Posted: Fri Mar 04, 2022 3:51 pm
by ugvu
When I'm using command

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ip link set mtu 1280 dev eth0
it returns

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rk_gmac-dwmac ff540000.ethernet eth0: must be stopped to change its MTU
.
So I make the link down to use the same command but it returns

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SIOCSIFMTU: Invalid argument


Does anyone have the same problem?