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I'm following the below link to configure Linux server as Router.

I would like to know if the Linux server will behave as actual router i.e. Suppose if it receives a packet whose MTU size is greater than next hop, it will drop the packet ?

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The server will not necessarily drop the packet. It will fragment it, unless the Don't Fragment bit is set. In this case it will respond with a Destination Unreachable ICMP message.

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  • Thanks for your answer. In case of IPv6, it needs to drop the packet right, and also if the Don't fragment is set, then we can expect ICMP - Packet Too Big message
    – Subhash
    Mar 31, 2017 at 7:22

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