Samba security

[generaal]

Hi

I want our Samba server setup to allow any PC to access the share. At the moment we have a list of IPs that are allowed to access the share but since we are on DHCP the IPs change quite often. This is the setup:

# IBM_PROLOG_END_TAG
[global]
workgroup = vwza.emea.vwg
security = user
map to guest = Bad User
server string = Fileshare on (%h)
encrypt passwords = yes
wins support = no
log level = 3
log file = /usr/local/logs/samba/%m.log
max log size = 3000
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
dns proxy = No
#hosts deny = ALL
hosts allow = //This area contains the list of IPs
read only = no
share modes = yes

[GRC]
comment = Shared data
path = /GRC
public = yes
guest ok = yes
guest only = yes
guest account = nobody
browsable = yes
read only = no
browsable = yes


I have been trying without success and have tried everything, but my knowledge of Samba is limited to say the least