Had a server which was taking 10 seconds to login after moving it from a hub to a VLAN on a switch. Sub interfaces were also created on the ASA.
Checked all the speed and duplex on the switch ports and server all looked good.
Linux command for checking network card info
sudo ethtool eth0
Sent some large ping packets back and forth was fine.
Found the issue was /etc/resolv.conf
The server couldn't reach the DNS servers configured in there
We changed the DNS servers to reachable ones and the issue was resolved.
The server must have been trying to resolve our IP address during login.
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