You might also have a look at hosts.allow and hosts.deny
(http://linux.about.com/od/commands/l/blcmdl5_hostsal.htm is just the
first google result; the man pages certainly have more info, but I
don't use hosts.* myself so I can only really provide a pointer). I'm
not sure that really adds anything that the firewall rule wouldn't
already, though.
well, if i understood the question correctly, this should do.
put to file /etc/hosts.allow:
ALL:ALL
put to file /etc/hosts.deny:
sshd: .your.domain.com allowed_ip_addresses allowed_networks
allowed_hostnames
you can put more or less anything on the line and control who's allowed
to connect (man hosts.deny). i'd say it is straightforward and works
immediatelly without a need to (re)configure a firewall.
best,
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