VPN is up, traffic flows, but performance is extremely low. CPU is normal. What's the most likely reason?

The correct answer is A. Wrong MTU. Classic reason for slow VPN while CPU is fine: MTU mismatch causes fragmentation Fragmentation causes retransmissions → slow throughput

Troubleshooting NAT and VPN Issues

Question

Options

AWrong MTU
BIPSec packet fragmentation
CNAT detection
DKey renegotiation

How the community answered

(23 responses)

A
74% (17)
B
13% (3)
C
9% (2)
D
4% (1)

Explanation

Classic reason for slow VPN while CPU is fine: MTU mismatch causes fragmentation Fragmentation causes retransmissions → slow throughput

Topics

#VPN performance#MTU#IPSec fragmentation#throughput

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