Hello,
We have WAN-link with 1Gbit/s throughput, but 40 ms latency.
iperf3 UDP test really can do 1Gbit/s almost lossless.
We have L2TP IPsec tunnel over this WAN-link:
LAN1---[CHR]---(l2tp_ipsec_vpn)---[CCR]---LAN2
Now file copy between LAN1 and LAN2 is only 6 MB/s maximum.
I try different aes modes (cbc/ctr/gcm), but but file copy speed does not increase noticeably.
Why IPsec tunnel do not use all 1G bandwidth?