configs and speeds

[ns]

hi guys,

what is DPD and what's its different with keepalive
and if i disable DPD(and how i can do it), i can avoid from 
disconnectivity and if yes, it will make more load for resources like CPU ?

latency to server sometimes grow up after a period wheni restart server 
it will fix
DPD can fix this ? how ? a dead peer make latency high ?

and if certificates be 2048 bit it will make slow connection or make 
high latency?

and when i connected to server with anyconnect client i cant access to 
ssh in server and also to anything in server
and how i can change connection port in client from 443 to other i have 
latest client version (anyconnect-win-3.1.05182-pre-deploy-k9)

# TCP and UDP port number
tcp-port = 443             ######----if i change this i cant use it, i 
think cuz client just uses 443
udp-port = 443            ######----if i change this i cant use it, i 
think cuz client just uses 443

# Keepalive in seconds                                ##### this will 
disconnect vpn client ?
keepalive = 32400

# Dead peer detection in seconds.            ##### what will happen if 
we disable this ?
dpd = 90