Today I almost started pulling my hairs off!
I have this office space in wich I put one RB951ui2hd as the main Router + Wifi wich serves 2 PCs connected via LAN ports eth 2 and 3 and I also have a second office space 30m away to wich I have a cat 5e UTP cable within walls, connected in port eth3. I want to set up a second device in the later room, a hAP Lite wich will provide wifi as well and connect 2 PCs in the same LAN.
For some reason, I can't get the hAP Lite to work. I only get a 10Mbps Full Duplex link on any ethernet port when I connect the cat5e cable wich comes from my main RB951ui2hnd.
I tried several resets and configurations and the only thing I get are some errors with link up, link down, link up, link down then settles to 10Mbps Full Duplex but it doesn't get an IP via dhcp client, I can't ping the main router, It doesn't work with static IP configuration either. It also takes a while untill the link is detected by the interface.
And here is the fun part:
If I connect the cable straight in my Dell Latitude E4310 I get a solid 100Mbps connection with Internet, full ISP speeds, IPs and all.
If I connect the cable straight in the Lenovo desktop in that office I get a 10Mbps full duplex with Internet, IPs and all.
What the..? Is the cable bad? Is the RB951ui bad..? Is there some conflict between the hAP Lite and the RB951? Is my Dell's wireless card more "ignorant" to cable issues than the Lenovo's desktop and the hAP's and that is why I get a full 100Mbps even though I find that hard to believe?
Yes I did try and crimp the cable both "straight" and "cross-over", exactly the same result!
Both hAP and RB951ui have autonegociation on, flow control off as by default.
I will attach a diagram in PDF (please rotate)