Black Box MPSH16-D20-120V Manual De Usuario

 

5.9.3.2.  Linux Operators and Wild Cards
In addition to entering a specific IP address or partial IP address in the Allow or Deny 

list, you may also use standard Linux operators or wild cards.  In most cases, the 

only operator used is "EXCEPT" and the only wild card used is "ALL," but more 

experienced Linux users may note that other operators and wild cards may also be 

used.

EXCEPT:  This operator creates an exception in either the "allow" list or "deny" 

list.  For example, if the Allow list includes a line which reads "192. EXCEPT 

192.255.255.6," then all IP address that begin with "192." will be allowed; except 

192.255.255.6 (providing that this address appears in the Deny list.)

ALL:  The ALL wild card indicates that all IP Addresses should be allowed or 

denied.  When ALL is included in the Allow list, all IP addresses will be allowed 

to connect; conversely, if ALL is included in the Deny list, all IP Addresses will be 

denied (except for IP addresses listed in the Allow list.)  For example, if the Deny list 

includes a line which reads "ALL EXCEPT 168.255.192.192," then all IP addresses 

except 168.255.192.192 will be denied (except for IP addresses that are listed in the 

Allow list.)

Net/Mask Pairs:  An expression of the form "n.n.n.n/m.m.m.m" is interpreted 

as a "net/mask" pair.  A host address is matched if "net" is equal to the bitwise 

AND of the address and the "mask."  For example, the net/mask pattern 

"131.155.72.0/255.255.254.0" matches every address in the range "131.155.72.0" 

through "131.155.73.255."