Ubuntu system has two interfaces - ETh0 & wlan0 ETh0 is conected to local test network through switch wifi is conected to Access point
Eth0 got ip 172.18.201.100
wlan0 got ip 172.18.202.87
Default routes added
172.18.201.0 0.0.0.0 255.255.255.0 eth0
172.18.202.0 0.0.0.0 255.255.255.0 wlan0
the issue is when ssh session is opened without wifi ..it is success through this ssh session , wifi -- wpa_supplicant is configured for wpa-psk At this moment the actual ssh session is getting lost and you are loosing the remote access to device . ANy fix is great help ! I took the google help but it did not resolve the issue. If any one faced the same , share the info to fix this