I've installed my Linksys WRT1900ACS today nad I've noticed one thing.
One of my port is wrongly negotiating the speed (the cable is very long as I'm changing the floor level).
When I use this cable on my modem, it negotiate 100baseT full duplex and it's working fine.
When I plug it in my router, it negiate 1000baseT full duplex and in that case theres is no network on this port.
Here is the information I got with the command swconfig:
swconfig dev switch0 port 0 show
mask: 0x0000: (0)
link: port:0 link:up speed:1000baseT full-duplex
The question is how could I force the link speed on this specific port to 100baseT full-duplex.