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•
Service Type. Choose one of the Service Type match conditions for the extended IP ACL
rule. The possible values are IP DSCP, IP precedence, and IP TOS, which are alternative
ways of specifying a match criterion for the same Service Type field in the IP header,
however each uses a different user notation. After you select the service type, specify the
value associated with the type.
•
IP DSCP: Specify the IP DiffServ Code Point (DSCP) value. The DSCP is defined as
the high-order six bits of the Service Type octet in the IP header. Select an IP DSCP
value from the menu. To specify a numeric value in the available field, select Other
from the menu and type an integer from 0 to 63 in the field.
•
IP Precedence: The IP Precedence field in a packet is defined as the high-order three
bits of the Service Type octet in the IP header. This is an optional configuration. Enter
an integer from 0 to 7.
•
IP TOS Bits: Matches on the Type of Service bits in the IP header when checked. In
the first TOS field, specify the two-digit hexadecimal TOS number. The second field
is for the TOS Mask, which specifies the bit positions that are used for comparison
against the IP TOS field in a packet. The TOS Mask value is a two-digit hexadecimal
number from 00 to ff, representing an inverted (i.e. wildcard) mask. The zero-valued
bits in the TOS Mask denote the bit positions in the TOS Bits value that are used for
comparison against the IP TOS field of a packet. For example, to check for an IP TOS
value having bits 7 and 5 set and bit 1 clear, where bit 7 is most significant, use a TOS
Bits value of a0 and a TOS Mask of 00.
3. To delete an IP ACL rule, select the check box associated with the rule, and then click Delete.
4. Click Cancel to cancel the configuration on the screen and reset the data on the screen to the
latest value of the switch.
5. To modify an existing IP Extended ACL rule, click the Rule ID. The number is a hyperlink to
the Extended ACL Rule Configuration page.
Managing Device Security
GS108T and GS110TP Smart Switch Software Administration Manual
v1.0, April 2010
5-57
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