Resolve IP Fragmentation, MTU, MSS, and PMTUD Issues With GRE and IPSEC
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Overview: The rationale of this white paper is to present how IP Fragmentation and Path Maximum Transmission Unit Discovery (PMTUD) work and to discuss some scenarios involving the activities of PMTUD when pooled with different combinations of IP tunnels. The extensive use of IP tunnels in the Internet has brought the problems involving IP Fragmentation and PMTUD to the forefront.

