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Cannot browse the Internet through the GRE tunnel, but able to ping and Telnet
This issue is most likely caused by fragmentation of packets needed to pass traffic, but the Don't Fragment (DF) bit is set.
Increase the Maximum Transmission Unit (MTU) to 1524 or use Policy-Based Routing (PBR) to clear and set the DF bit. Another option is to change the Transmission Control Protocol (TCP) Maximum Segment Size (MSS) option value on Synchronization (SYN) packets that traverse through the router.