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01-WLAN optimization configuration | 155.44 KB |
1 Configuring WLAN optimization
Restrictions and guidelines: WLAN optimization configuration
Configuring rejection of weak-signal clients
Configuring AP-triggered client reassociation
Configuring hidden node protection
Configuring multicast and broadcast buffering
Configuring smart chip protection
Configuring roaming navigation
Configuring packet receiving timing adjustment
Enabling or disabling an AP to decrease the sleep interval of clients
Configuring immediate packet sending
Setting the maximum number of probe response attempts
Setting the maximum interference threshold
Configuring link performance optimization
Configuring transmit power adjustment
Configuring 802.11n packet suppression
Configuring fast forwarding of AP-to-client data frames
Setting the maximum retransmissions and retries for an EAPOL-Key packet
Configuring software retransmission
Configuring the packet DSCP precedence
Enabling data transmission holding during roaming
Enabling upstream ARP packet suppression
Enabling application traffic forwarding acceleration
Enabling the AP to reply ARP requests of clients on behalf of the gateway
1 Configuring WLAN optimization
About WLAN optimization
Proper channel planning and power control policies during WLAN deployment are important for good performance. However, in live WLAN networks, channel overlapping, collisions, and interference can easily occur because the none-overlapping channels are limited but the number of WLAN devices always increases.
The WLAN optimization features can help you improve the quality and stability of a WLAN.
Restrictions and guidelines: WLAN optimization configuration
Use WLAN optimization commands under the guidance of H3C Support.
There is no fixed combination of features for optimizing a specific WLAN. Select and adjust the features based on the application effect and WLAN performance.
The overall performance of a WLAN is determined by the network architecture as well as channel and power planning. Therefore, the WLAN optimization features cannot significantly increase the performance of a WLAN. In practice, if the features can improve the WLAN performance by 3%, the optimization is considered successful.
Configuring rejection of weak-signal clients
About this task
This feature enables an AP to reject clients with an RSSI lower than the specified threshold to release channel resources and enhance WLAN performance.
Restrictions and guidelines
After you enable this feature, wireless clients with an RSSI lower than the threshold might fail to access the WLAN.
After a client accesses the WLAN, an AP will not log off the client with an RSSI lower than the threshold but will reject the client after it disconnects from the network.
To avoid client access failures, set an appropriate RSSI value when enabling this feature.
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure rejection of weak-signal clients.
option client reject { disable | enable [ rssi rssi-value ] }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, rejection of weak-signal clients is disabled.
Configuring AP-triggered client reassociation
About this task
A client with a low signal strength can roam to another AP only when its signal strength is lower than the manufacturer-defined signal strength for triggering roaming. Therefore, the client cannot obtain good network experience and service quality.
This feature enables an AP to send unsolicited deauthentication frames to a client when the signal strength of the client is lower than the specified RSSI threshold. Then, the client can reassociate with the AP or roam to another AP.
Restrictions and guidelines
To avoid unexpected client logoff, set an appropriate RSSI value when enabling this feature.
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure AP-triggered client reassociation.
option client reconnect { disable | enable [ rssi rssi-value ] [ interval interval ] }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, AP-triggered client reassociation is disabled.
Configuring hidden node protection
About this task
This feature enables clients to send RTS or CTS frames before transmitting frames to avoid interference from hidden nodes.
Restrictions and guidelines
This feature takes effect only on 802.11g, 802.11n, and 802.11ac clients.
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure hidden node protection.
option client hide-node-protection { disable | enable }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, hidden node protection is disabled.
Configuring multicast and broadcast buffering
About this task
With this feature enabled, the AC stops sending broadcast and multicast packets and buffers them if an associated client is in sleep state. This mechanism affects the performance of real-time multicast applications.
With this feature disabled, the AC directly sends all broadcast and multicast packets regardless of whether an associated client is in sleep state.
Restrictions and guidelines
As a best practice, set the power management parameter to the maximum value on wireless clients before you disable this feature.
Disabling this feature disables clients in sleep state from receiving some broadcast and multicast packets.
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure multicast and broadcast buffering.
option broadcast-multicast-buffer { disable | enable [ limit limit ] }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, multicast and broadcast buffering is enabled.
Configuring channel reuse
About this task
This feature enables an AP to ignore packets with a signal strength lower than the specified channel reuse level. This mechanism enables the AP to obtain more radio resources and improves the performance of APs working on the same channel.
Restrictions and guidelines
Enabling this feature might add hidden nodes.
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure channel reuse.
option channel-reuse-optimization { disable | enable level level }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, channel reuse is disabled.
Configuring smart chip protection
Hardware and feature compatibility
Hardware series |
Model |
Feature compatibility |
WA6600 series |
WA6638 WA6638i WA6636 WA6630X WA6628 WA6628X WA6622 WA6620 WA6620X WA6620X-LI WA6620XE-LI |
No |
WA6500 series |
WA6528i |
Yes |
WA6300 series |
WA6338 WA6338-HI WA6338-LI WA6330 WA6330-LI WA6322 WA6322H WA6322H-LI WA6320 WA6320-C WA6320-D WA6320-SI WA6320S-C WA6320S-E WA6320H WA6320H-LI WA6320H-XEPON |
Yes |
WAP922 series |
WAP922 WAP922E WAP922H WAP922X |
Yes: · WAP922 · WAP922E · WAP922H No: · WAP922X |
WAP923 series |
WAP923 |
Yes |
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure smart chip protection.
option smart-chip-protection { disable | enable interval interval }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, smart chip protection is disabled.
Configuring roaming navigation
About this task
802.11 protocols do not provide any client roaming control mechanisms and some clients cannot actively roam to APs with better signal strength.
Perform this task to decrease the transmit power for beacons or probe responses of an AP to enable clients to roam to APs with better signal strength.
If you set the transmit power for beacons or probe responses, the system uses the default transmit power to transmit other packets.
Hardware and feature compatibility
Hardware series |
Model |
Feature compatibility |
WA6600 series |
WA6638 WA6638i WA6636 WA6630X WA6628 WA6628X WA6622 WA6620 WA6620X WA6620X-LI WA6620XE-LI |
No |
WA6500 series |
WA6528i |
Yes |
WA6300 series |
WA6338 WA6338-HI WA6338-LI WA6330 WA6330-LI WA6322 WA6322H WA6322H-LI WA6320 WA6320-C WA6320-D WA6320-SI WA6320S-C WA6320S-E WA6320H WA6320H-LI WA6320H-XEPON |
Yes |
WAP922 series |
WAP922 WAP922E WAP922H WAP922X |
Yes: · WAP922 · WAP922E · WAP922H No: · WAP922X |
WAP923 series |
WAP923 |
Yes |
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure roaming navigation.
option roam-navigation { disable | enable rssi rssi-value { beacon-power power-value | probe-response-power power-value } }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, roaming navigation is disabled.
Configuring packet receiving timing adjustment
About this task
This feature enables an AP to adjust the timing for receiving packet to achieve the optimal receiving effect.
Hardware and feature compatibility
Hardware series |
Model |
Feature compatibility |
WA6600 series |
WA6638 WA6638i WA6636 WA6630X WA6628 WA6628X WA6622 WA6620 WA6620X WA6620X-LI WA6620XE-LI |
No |
WA6500 series |
WA6528i |
Yes |
WA6300 series |
WA6338 WA6338-HI WA6338-LI WA6330 WA6330-LI WA6322 WA6322H WA6322H-LI WA6320 WA6320-C WA6320-D WA6320-SI WA6320S-C WA6320S-E WA6320H WA6320H-LI WA6320H-XEPON |
Yes |
WAP922 series |
WAP922 WAP922E WAP922H WAP922X |
Yes: · WAP922 · WAP922E · WAP922H No: · WAP922X |
WAP923 series |
WAP923 |
Yes |
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure packet receiving timing adjustment.
option rx-opportunity-optimize { disable | enable }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, packet receiving timing adjustment is disabled.
Enabling or disabling an AP to decrease the sleep interval of clients
About this task
A wireless client in sleep state listens for traffic indication map (TIM) information in beacon frames to determine whether the associated AP has buffered packets for it. This feature enables an AP to modify the TIM information in beacon frames to decrease the sleep interval of wireless clients to improve transmission efficiency.
Hardware and feature compatibility
Hardware series |
Model |
Feature compatibility |
WA6600 series |
WA6638 WA6638i WA6636 WA6630X WA6628 WA6628X WA6622 WA6620 WA6620X WA6620X-LI WA6620XE-LI |
No |
WA6500 series |
WA6528i |
Yes |
WA6300 series |
WA6338 WA6338-HI WA6338-LI WA6330 WA6330-LI WA6322 WA6322H WA6322H-LI WA6320 WA6320-C WA6320-D WA6320-SI WA6320S-C WA6320S-E WA6320H WA6320H-LI WA6320H-XEPON |
Yes |
WAP922 series |
WAP922 WAP922E WAP922H WAP922X |
Yes: · WAP922 · WAP922E · WAP922H No: · WAP922X |
WAP923 series |
WAP923 |
Yes |
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Enable or disable an AP to decrease the sleep interval of clients.
option keep-active { disable | enable }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, a radio does not decrease the sleep interval of clients.
Configuring immediate packet sending
About this task
When you enable this feature, APs do not detect channel collision before sending packets to save system resources and improve network throughput. Enabling this feature might cause hidden node problems. When you disable this feature, wireless devices send RTS/CTS packets to avoid channel collision.
Restrictions and guidelines
Disabling this feature might cause hidden node issues.
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure immediate packet sending.
option immediate-transmit { disable | enable }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, immediate packet sending is disabled.
Setting the maximum number of probe response attempts
About this task
Perform this task to reduce the number of probe responses sent by a radio to save resources and improve network performance.
Hardware and feature compatibility
Hardware series |
Model |
Feature compatibility |
WA6600 series |
WA6638 WA6638i WA6636 WA6630X WA6628 WA6628X WA6622 WA6620 WA6620X WA6620X-LI WA6620XE-LI |
No |
WA6500 series |
WA6528i |
Yes |
WA6300 series |
WA6338 WA6338-HI WA6338-LI WA6330 WA6330-LI WA6322 WA6322H WA6322H-LI WA6320 WA6320-C WA6320-D WA6320-SI WA6320S-C WA6320S-E WA6320H WA6320H-LI WA6320H-XEPON |
Yes |
WAP922 series |
WAP922 WAP922E WAP922H WAP922X |
Yes: · WAP922 · WAP922E · WAP922H No: · WAP922X |
WAP923 series |
WAP923 |
Yes |
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Set the maximum number of probe response attempts.
option probe-response-try { disable | enable number }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, the maximum number of probe response attempts is not limited.
Setting the maximum interference threshold
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Set the maximum interference threshold.
option max-interfer-threshold { disable | enable value }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, the maximum interference threshold is not configured.
Configuring link performance optimization
About this task
Perform this task to modify the packet fragmentation threshold to optimize link performance.
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure link performance optimization.
option optimize-link-performance { inbound | outbound } { disable | enable } [ value ]
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, link performance optimization is disabled.
Configuring transmit power adjustment
About this task
This feature enables an AP to use the adjusted transmit power to transmit packets.
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure transmit power adjustment.
option capacity-adjust { disable | enable [ all ] { increase | decrease } value }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, transmit power adjustment is disabled.
Configuring 802.11n packet suppression
About this task
Perform this task to suppress 802.11n packets by defining the maximum number of aggregated MPDUs and the maximum A-MPDU length. The two thresholds take effect at the same time. If either threshold is reached, the AP stops aggregation and sends the A-MPDU.
This feature prevents 802.11n clients from affecting the performance of 802.11a and 802.11b/g clients.
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure 802.11n packet suppression.
option dot11n-restraint { disable | enable packet-number packet-number packet-length packet-length } [ inbound | outbound ] [ tid tid-number ]
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, 802.11n packet suppression is disabled.
Configuring fast forwarding of AP-to-client data frames
About this task
This feature enables an AP to forward data frames to clients without extra processing (such as verification and counting) to improve processing efficiency.
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Configure fast forwarding of AP-to-client data frames.
option client fast-forwarding { disable | enable level level-value }
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, fast forwarding of AP-to-client data frames is disabled.
Setting the maximum retransmissions and retries for an EAPOL-Key packet
About this task
In Robust Security Network Association (RSNA) authentication, an AP and a client use EAPOL-Key packets in the four-way handshake to negotiate the keys. After that, the AP and the client periodically exchange EAPOL-Key packets to update the keys.
During key negotiation or update, the AP keeps retransmitting an EAPOL-Key packet until a response is received or the maximum number of retries for an EAPOL-Key packet is reached.
The system starts to count the retries when the maximum number of retransmissions is reached.
For more information about RSN key negotiation or update, see WLAN Security Configuration Guide.
Restrictions and guidelines
To ensure successful RSN key negotiation or update, you can increase the maximum number of retransmissions and the maximum number of retries for an EAPOL-Key packet.
Procedure
1. Enter system view.
system-view
2. Enter service template view.
wlan service-template service-template-name
3. Set the maximum number of retransmissions for an EAPOL-Key packet and the retransmission interval.
option 4-way-handshake resend max-count [ interval interval ]
By default, the maximum number of retransmissions for an EAPOL-Key packet is three, and the retransmission interval is 300 milliseconds.
4. Set the maximum number of retries for an EAPOL-Key packet and the retry interval.
option 4-way-handshake retry max-count [ interval interval ]
By default, the maximum number of retries for an EAPOL-Key packet is three, and the retry interval is 5 seconds.
Configuring software retransmission
About this task
Perform this task to configure software retransmission and set the maximum number of software retransmissions for the specified type of packets.
Procedure
1. Enter system view.
system-view
2. Enter AP view or an AP group's AP model view.
¡ Enter AP view.
wlan ap ap-name
¡ Execute the following commands in sequence to enter an AP group's AP model view:
wlan ap-group group-name
ap-model ap-model
3. Enter radio view.
radio radio-id
4. Enable software retransmission and set the maximum number of software retransmissions.
rrop software-retry { unicast [ eap ] | broadcast-multicast } enable count count
By default:
¡ In radio view, a radio uses the configuration in an AP group's radio view.
¡ In an AP group's radio view, the maximum number of software retransmissions varies by device model.
Enabling client inspection
About this task
The client inspection feature enables you to view information about packets exchanged and time consumed in each stage of the client association process.
In the current software version, the client inspection feature supports only client association, client association failure, and IP address lease extension events.
Procedure
1. Enter system view.
system-view
2. Enter AP view or AP group view.
¡ Enter AP view.
wlan ap ap-name
¡ Enter AP group view.
wlan ap-group group-name
3. Enable client inspection.
wlan client inspect enable
By default, client inspection is disabled.
Configuring the packet DSCP precedence
About this task
Perform this task to configure the DSCP precedence for TCP or UDP packets with the specified port numbers. A greater DSCP precedence value represents a higher packet priority.
Procedure
1. Enter system view.
system-view
2. Enter AP view or AP group view.
¡ Enter AP view.
wlan ap ap-name
¡ Enter AP group view.
wlan ap-group group-name
3. Specify a DSCP value for TCP packets.
rrop traffic-policy priority tcp port-num-list dscp value
By default:
¡ In AP view, an AP uses the configuration in AP group view.
¡ In AP group view, no DSCP value is specified for TCP packets.
4. Specify a DSCP value for UDP packets.
rrop traffic-policy priority udp port-num-list dscp value
By default:
¡ In AP view, an AP uses the configuration in AP group view.
¡ In AP group view, no DSCP value is specified for UDP packets.
Enabling data transmission holding during roaming
About this task
With data transmission holding during roaming enabled, the device caches the packets during client roaming and sends the packets to the client after the client roams successfully to reduce the packet loss during client roaming. With data transmission holding during roaming disabled, the device ages out the cached packets after a period of time and will not send the packets to the client. As a best practice, enable this feature in the packet loss-sensitive scenario.
Restrictions and guidelines
To make this feature take effect, enable client association at the AC and enable the AC to forward client data traffic.
This feature is not supported in an AC hierarchy network or inter-AC roaming network.
Procedure
1. Enter system view.
system-view
2. Enter service template view.
wlan service-template service-template-name
3. Enable data transmission holding during roaming.
sacp roam-optimize traffic-hold enable
By default, data transmission holding during roaming is disabled.
Enabling upstream ARP packet suppression
About this task
Perform this task to protect APs against ARP flooding attacks. If the number of ARP packets that a client sends to an AP in one second reaches the specified threshold, the AP discards all ARP packets from the client within the specified suppression period.
Restrictions and guidelines
This feature does not take effect on ARP requests for the gateway.
Procedure
1. Enter system view.
system-view
2. Enable upstream ARP packet suppression.
rrop ul-arp attack-suppression enable [ threshold threshold-value ] [ block-time time ]
By default, upstream ARP packet suppression is disabled.
Enabling application traffic forwarding acceleration
About this task
Perform this task to accelerate the forwarding of downstream application traffic such as voice call traffic and video conference traffic to improve user experiences.
Restrictions and guidelines
This feature is memory intensive. Please be cautious.
Procedure
1. Enter system view.
system-view
2. Enter wireless service template view.
wlan service-template service-template-name
3. Enable application traffic forwarding acceleration.
sacp application forwarding-acceleration enable
By default, application traffic forwarding acceleration is disabled.
Enabling the AP to reply ARP requests of clients on behalf of the gateway
About this task
Perform this task to enable the AP to reply ARP requests of clients on behalf of the gateway. If the MAC address of the gateway changes during a reply period, ARP failures might occur. To resolve this issue, you can specify a limit for the number of ARP requests that the AP can reply on behalf of the gateway in a reply period. When the number of ARP requests that the AP has replied reaches the limit, the AP will forward an ARP request to the gateway and perform either of the following tasks:
· If the gateway replies to the ARP request, the AP starts a new reply period with the new MAC address of the gateway.
· If the gateway does not reply to the ARP request, the AP starts a new reply period with the original MAC address of the gateway.
Restrictions and guidelines
As a best practice to reduce the gateway's service load, enable this feature when the gateway's service load is heavy or the network condition is poor.
Procedure
1. Enter system view.
system-view
2. Enable the AP to reply ARP requests of clients on behalf of the gateway.
rrop arp ap-proxy-gateway enable [ count count ]
By default, the AP does not reply ARP requests of clients on behalf of the gateway.