Cisco Cisco IOS Software Release 12.4(2)XB6 Références techniques
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Cisco Broadband Wireless Gateway 2.0 Command Reference, IOS Release 12.4(24)YG
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Chapter Cisco Broadband Wireless Gateway 2.0 Command Reference, IOS Release 12.4(24)YG
host-overflow
host-overflow
To enable the DHCP Host Caching feature and configure the size of the cache list and the idle timer, use
the host-overflow command in user group configuration submode. Use the no form of the command to
disable this feature.
the host-overflow command in user group configuration submode. Use the no form of the command to
disable this feature.
host-overflow [size 1-100] [min-idle 1- 60]
no host-overflow [size 1-100] [min-idle 1- 60]
Syntax Description
Defaults
The size default value is 50. The min-idle timer value default value is 5 minutes.
Command Modes
User group configuration sub mode.
Command History
Usage Guidelines
•
Once a data packet is received, since there is no MAC address, the match in the array of records will
only be based on IP, and we will not be able to differentiate between dynamic host and spoofing
static host. A possible effect would be both actual DHCP host and spoofing host keep on sending
traffic with the DHCP host renewing the lease while the spoofing host is “taking advantage”.
However, there is no change in the existing behavior and this issue exists today. If the the real IP
host is attached to the CPE and the spoofed CPE can start using same address with the same CPE.
only be based on IP, and we will not be able to differentiate between dynamic host and spoofing
static host. A possible effect would be both actual DHCP host and spoofing host keep on sending
traffic with the DHCP host renewing the lease while the spoofing host is “taking advantage”.
However, there is no change in the existing behavior and this issue exists today. If the the real IP
host is attached to the CPE and the spoofed CPE can start using same address with the same CPE.
•
If static IP is allowed, and the record of a DHCP host removed from CPE is also removed from the
array (overwritten by some other record), when the DHCP host comes back, the first data packet we
intercept is going to result in opening a static host (as per existing code since static IP is allowed).
If the host never sends a DHCP renewit will be treated as static, and never deleted unless it gets
kicked out. However, this is the user’s choice and existing behavior is exactly same
array (overwritten by some other record), when the DHCP host comes back, the first data packet we
intercept is going to result in opening a static host (as per existing code since static IP is allowed).
If the host never sends a DHCP renewit will be treated as static, and never deleted unless it gets
kicked out. However, this is the user’s choice and existing behavior is exactly same
•
If host accounting is enabled, the accounting start/atop for the host can be the overhead.
The memory requirement is higher per session in cases where hot spot CPE usage is higher in the
network.
network.
size 1-100
Specifies the size of the cache list. The range is 1-100, the default value is 50.
min-idle 1- 60
Establishes the criteria to move a subscriber from the active to the overflow
list. The min-idle prevents the BWG from frequently moving a host from
active host list to overflow list. The range is 1-60, the default value is 5,
represented in minutes.
list. The min-idle prevents the BWG from frequently moving a host from
active host list to overflow list. The range is 1-60, the default value is 5,
represented in minutes.
Release
Modification
12.4(24)YG
This command was introduced.