Hi,
We are having some weird issue, where throughput is very low 2MB/sec between two hosts over the Single Model Fiber WAN link.
On investigation, its found that our carrier port is configured as 10G/Auto negotiate and negotiating in 10G and my side Cisco ISR 4431 is negotiating in 1G.
First of all I dont know why they are able to negotiate this way.
Second question if one side is negotiated as 10G(carrier) and other side is 1G(me) , can it cause performance issues ? I am seeing low throughput and Dup acks in wireshark.