Two scenarios for preventing fragmentation on GRE tunnel?

Two scenarios for preventing fragmentation on GRE tunnel? (Choose two)
A. TCP MSS
B. DF Bit clear
C. IP MTU
D. PMTUD

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6 thoughts on “Two scenarios for preventing fragmentation on GRE tunnel?

  1. You don,t need path mtu discovery if u use ip tcp mss , ip mtu need for other type traffic . so A and C

  2. A and D:

    Path MTU Discovery (PMTUD) is a standardized technique in computer networking for determining the maximum transmission unit (MTU) size on the network path between two Internet Protocol (IP) hosts, usually with the goal of avoiding IP fragmentation.

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