Path MTU Discovery
The sender marks packets Don't-Fragment and shrinks its packet size when an ICMP Fragmentation-Needed message reports a smaller link on the path, converging on the largest size that fits end-to-end. Firewalls that drop ICMP cause the classic black hole where small packets pass and large ones silently vanish.
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The sender marks packets Don't-Fragment and shrinks its packet size when an ICMP Fragmentation-Needed message reports a smaller link on the path, converging on the largest size that fits end-to-end. Firewalls that drop ICMP cause the classic black hole where small packets pass and large ones silently vanish.
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