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vpn it's work but Some sites cannot be accessed but every time I connect to my VPN, I should run "sudo ifconfig ppp0 mtu 1500" How could I make it permanent?

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You need to edit the interfaces file present under "/etc/network/"

vi /etc/network/interfaces

Add the MTU size like below

mtu 9000

Run the following command

/etc/init.d/networking restart

I got this information from https://www.cyberciti.biz/faq/centos-rhel-redhat-fedora-debian-linux-mtu-size/

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  • Thank you for solving the problem – rin Mar 13 '20 at 9:34
  • No problem..... – Karthikeyan Mar 13 '20 at 10:11

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