In the following figure, a GRE tunnel is established between R1 and R4 to transmit data from PC1 to PC2. The TTL of the packet sent from GE0/0/1 of R1 is 126. What is the TTL of the packet sent from GE0/0/3 of R3?

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Reference / correct answer:
Most accepted answer: D. 124
Community votes: B=1, D=2
Selected Answer: D Outer IP TTL decrements at each underlay hop (R2, R3), so 126 → 125 at R2 → 124 leaving R3 — the inner TTL is untouched between tunnel endpoints. upvoted 1 times
Selected Answer: D the ttl in this question is before the gre header, the ttl will decrease each hop upvoted 2 times megamind23 2 months, 1 week ago Outer IP TTL decrements at each underlay hop (R2, R3), so 126 → 125 at R2 → 124 leaving R3 — the inner TTL is untouched between tunnel endpoints. upvoted 1 times ...
Outer IP TTL decrements at each underlay hop (R2, R3), so 126 → 125 at R2 → 124 leaving R3 — the inner TTL is untouched between tunnel endpoints. upvoted 1 times
Selected Answer: B As I remember in GRE tunnels ttl remains same till tunnel out interface. So the answer might be 126 upvoted 1 times