Son of Beastie
Reaction score: 2,497
I went to a Cyber Cafe,checked with their LAN Cable in my Laptop, it started to toggle between: em0 link state down->up then up->down, with a gap of some seconds. So, It looks like my router is OK. Further, it is something to do with FreeBSD 11.2 Software itself! This may be a Bug or a Configuration issue.
Or your Ethernet card em0 is going bad.
pciconf -lv reveals,
iwm0@pci0: 4 :0 : 0 class=0x028000 card=0x52108086 chip=0x095b8086 rev=0x61 hdr=0x00
vendor = ' Intel Corporation'
device = ' Wireless 7265'
class = network.
That's your WiFi card. Your Ethernet network card ID is em0.