Setting up NV2 QOS - VoIP over wireless links

RouterOS Wireless Networking
1

I need to set up QoS on NV2 wireless to prioritize VoIP traffic. We have DSCP enabled on the network. I set the NV2 queue count to 8, and QoS to Frame Priority. In a older post, someone recommended the following Mangle rules for the AP. I am not sure how these settings alone would enable NV2 QoS to prioritize DSCP. Is this the correct way to set up QoS on NV2? Is there more that I need to do? How can I check to see if QoS is actually working on this link?

/ip firewall mangle
add action=set-priority chain=postrouting comment="From dscp high 3 bits" \
    new-priority=from-dscp-high-3-bits
add action=mark-packet chain=postrouting comment="Priority 0" \
    new-packet-mark=prio0 priority=0
add action=mark-packet chain=postrouting comment="Priority 1" \
    new-packet-mark=prio1 priority=1
add action=mark-packet chain=postrouting comment="Priority 2" \
    new-packet-mark=prio2 priority=2
add action=mark-packet chain=postrouting comment="Priority 3" \
    new-packet-mark=prio3 priority=3
add action=mark-packet chain=postrouting comment="Priority 4" \
    new-packet-mark=prio4 priority=4
add action=mark-packet chain=postrouting comment="Priority 5" \
    new-packet-mark=prio5 priority=5
add action=mark-packet chain=postrouting comment="Priority 6" \
    new-packet-mark=prio6 priority=6
add action=mark-packet chain=postrouting comment="Priority 7" \
    new-packet-mark=prio7 priority=7

Getting the m[/code]

2

be sure you have Fast-track disabled

keep in mind prioritizing only does matter when you have high-priority traffic competing with less-priority traffic

so it’s important to classify every kind of traffic

3

[*] I found examples that showed classifying UDP, TCP, and ICMP. When you say to classify all types of traffic, should I classify those three, plus add a classification for DSCP? The mangle rule that I currently have for DSCP is:

add action=set-priority chain=postrouting comment="From dscp high 3 bits" \

    new-priority=from-dscp-high-3-bits passthrough=yes

[*] I’ve seen QoS examples that showed setting the mangle rules on the postrouting chain, and some that showed using the output chain. Which is preferable for this scenario?

[*] This link is NV2 in bridge mode. Do I need to add the mangle rules only to the AP, or do they also need to go on the client bridges?

4

I changed the mangle rules and NV2 settings to the settings below. These are the only parameters that I’ve set. Anyone who’s had success with NV2 QoS, please let me know if you would do anything differently or if I’ve left anything out. Thank you.

/ip firewall mangle
add action=set-priority chain=output new-priority=3 protocol=udp
add action=set-priority chain=output new-priority=6 passthrough=yes protocol=tcp
add action=set-priority chain=output new-priority=7 protocol=icmp
add action=set-priority chain=output new-priority=from-dscp-high-3-bits passthrough=yes

/interface wireless
set nv2-qos=frame-priority
set nv2-queue-count=8