Network connectivity is suspended during DHCP lease negotiation. This is ungood, yes, but not a big problem if the negotiation doesn't happen very often.
Part of the problem in your case is that your DHCP lease time is very short.
> May 17 12:01:15 chloe dhclient: bound to 192.168.2.21 -- renewal in 229 seconds.
Network connectivity is suspended during DHCP lease negotiation. This is ungood, yes, but not a big problem if the negotiation doesn't happen very often.
Part of the problem in your case is that your DHCP lease time is very short.
> May 17 12:01:15 chloe dhclient: bound to 192.168.2.21 -- renewal in 229 seconds.
In my employer's network it's 250000 seconds.