You configured a GRE tunnel that traverses a path using default MTU settings. You want to ensure that packets are not dropped of fragmented. In this scenario, what is the maximum packet size that would traverse the GRE tunnel?
GRE adds two headers to each packet: the GRE header, which is 4 bytes long, and an IP header, which is 20 bytes long, thus when transmitting a packet it adds 24 bytes to it hence tunnel mtu is 1476 assuming physical links are operating at 1500 MTU size
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mkamau
3 years, 7 months ago