3Com 2916-SFP User Guide - Page 69

Source IP Address, Destination IP Address, Match DSCP, IGMP Type, Wild Card Mask

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Page 69 highlights

Defining Access Control Lists 69 ■ IGMP Type - Specifies an IGMP message type. ■ Any - Does not filter for an IGMP message type. ■ Source IP Address - If selected, enables matching the source port IP address to which packets are addressed to the ACE, according to a wildcard mask. The field value is either user defined or Any. If Any is selected, accepts any source IP address and disables wildcard mask filtering. ■ Wild Card Mask - Defines the source IP address wildcard mask. Wildcard masks specify which bits are used and which bits are ignored. A wildcard mask of 255.255.255.255 indicates that no bit is important. A wildcard mask of 0.0.0.0 indicates that all the bits are important. For example, if the source IP address is 149.36.184.198 and the wildcard mask is 0.0.0.255, the first three bytes of the IP address are matched, while the last eight bits are ignored. For the source IP address 149.36.184.198, this wildcard mask matches all IP addresses in the range 149.36.184.0 to 149.36.184.255. A wildcard mask must not contain leading zeroes. For example, a wildcard mask of 010.010.011.010 is invalid, but a wildcard mask of 10.10.11.10 is valid. ■ Destination IP Address - If selected, enables matching the destination port IP address to which packets are addressed to the ACE, according to a wildcard mask. The field value is either user defined or Any. If Any is selected, accepts any destination IP address and disables wildcard mask filtering. ■ Wild Card Mask - Indicates the destination IP Address wildcard mask. Wildcards are used to mask all or part of a destination IP Address. Wildcard masks specify which bits are used and which bits are ignored. A wildcard mask of 255.255.255.255 indicates that no bit is important. A wildcard mask of 0.0.0.0 indicates that all bits are important. For example, if the destination IP address 149.36.184.198 and the wildcard mask is 0.0.0.255, the first three bytes of the IP address are matched, while the last eight bits are ignored. For the destination IP address 149.36.184.198, this wildcard mask matches all IP addresses in the range 149.36.184.0 to 149.36.184.255. A wildcard mask must not contain leading zeroes. For example, a wildcard mask of 056.022.075.032 is invalid, but a wildcard mask of 56.22.75.32 is valid. ■ Match DSCP - Matches the packet DSCP value to the ACL. Either the DSCP value or the IP Precedence value is used to match packets to ACLs.

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Defining Access Control Lists
69
■
IGMP Type
— Specifies an IGMP message type.
■
Any
— Does not filter for an IGMP message type.
■
Source IP Address
— If selected, enables matching the source port IP
address to which packets are addressed to the ACE, according to a
wildcard mask. The field value is either user defined or
Any
. If
Any
is
selected, accepts any source IP address and disables wildcard mask
filtering.
■
Wild Card Mask
— Defines the source IP address wildcard mask.
Wildcard masks specify which bits are used and which bits are
ignored. A wildcard mask of 255.255.255.255 indicates that no bit
is important. A wildcard mask of 0.0.0.0 indicates that all the bits
are important. For example, if the source IP address is
149.36.184.198 and the wildcard mask is 0.0.0.255, the first three
bytes of the IP address are matched, while the last eight bits are
ignored. For the source IP address 149.36.184.198, this wildcard
mask matches all IP addresses in the range 149.36.184.0 to
149.36.184.255. A wildcard mask must not contain leading
zeroes. For example, a wildcard mask of 010.010.011.010 is
invalid, but a wildcard mask of 10.10.11.10 is valid.
■
Destination IP Address
— If selected, enables matching the
destination port IP address to which packets are addressed to the ACE,
according to a wildcard mask. The field value is either user defined or
Any
. If
Any
is selected, accepts any destination IP address and disables
wildcard mask filtering.
■
Wild Card Mask
— Indicates the destination IP Address wildcard
mask. Wildcards are used to mask all or part of a destination IP
Address. Wildcard masks specify which bits are used and which
bits are ignored. A wildcard mask of 255.255.255.255 indicates
that no bit is important. A wildcard mask of 0.0.0.0 indicates that
all bits are important. For example, if the destination IP address
149.36.184.198 and the wildcard mask is 0.0.0.255, the first three
bytes of the IP address are matched, while the last eight bits are
ignored. For the destination IP address 149.36.184.198, this
wildcard mask matches all IP addresses in the range 149.36.184.0
to 149.36.184.255. A wildcard mask must not contain leading
zeroes. For example, a wildcard mask of 056.022.075.032 is
invalid, but a wildcard mask of 56.22.75.32 is valid.
■
Match DSCP
— Matches the packet DSCP value to the ACL. Either
the DSCP value or the IP Precedence value is used to match packets to
ACLs.